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    Wyświetlanie 1-35 z 35
    Tytuł:
    Sensitivity of echo envelope fractal dimension to bottom type and bottom depth - numerical results
    Autorzy:
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332051.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    acoustic
    seafloor
    hydroacoustics
    Opis:
    The presented results are a part of those obtained within the author's latest work on application of normal incidence methods in acoustic seafloor characterisation. The work included both theoretical and experimental studies on selection of appropriate methods of seafloor echo processing and feature extraction for characterisation of the bottom type, especially, the study of the usefulness of several echo parameters like fractal dimension or statistical moments of the echo envelope. In this paper, the simulation results of the echo envelope fractal dimension dependence on bottom type and bottom depth are presented. They show that to same extent, fractal dimension of an echo may be useful for bottom identification even in a case of varying depth, however, more detailed, theoretical as well as experimental studies are needed.
    Źródło:
    Hydroacoustics; 2003, 6; 195-198
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulations of acoustic backscattering on fractally corrugated Seabed surface
    Autorzy:
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332288.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The numerical simulations of echosaunder signals scattering by fractally corrugated sea bed surface are presented. In particular, the relations between fractal dimension, describing the large scale roughness of sea bottom, and received echo envelope shape, were investigated. The fractal large scale relief of seabed suiface was generated assuming the power law form of the spatial frequency power spectrum, with exponent related to fractal dimension, and subsequently applying the two dimensional inverse FFT algorithm. In the secand stage, the bottom echo waveform was numerically modelled as an incoherent sum of coruributing echoes from all surface elements. For each element, the echo amplitude was calculated assuming the form of angular dependence of bottom backscattering coefficient for smal! scale roughness. The obtained results of simulations have revealed same conditions for the transferring of the seabed surface fractal structure onto the shape of echo wavefonn.
    Źródło:
    Hydroacoustics; 2000, 3; 25-28
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using multibeam echoes in seafloor characterisation and classification
    Autorzy:
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331600.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    multibeam echoes
    seafloor characterisation
    sonars
    Opis:
    The method of seabed identification and classification from multibeam sonar echoes is presented. The proposed approach is based on calculation of a set of parameters of an echo envelope, similarly as in seafloor classification using single beam echosounder. These parameters are extracted for each consecutive beam allowing the estimation of their dependence on the seafloor incident angle. The relation between seabed type and calculated echo parameters and its angular dependence, is investigated. The results obtained using sonar data records from several bottom types in Gdańsk Bay water region are presented and discussed. It has been primarily justified that the proposed approach may be useful in seafloor characterisation.
    Źródło:
    Hydroacoustics; 2008, 11; 265-270
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seafloor characterisation using multibeam data: sonar image properties, seabed surface properties and echo properties
    Autorzy:
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331826.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    In the paper, the approach to seafloor characterisation is presented. The multibeam sonars, besides their well verified and widely used applications like high resolution bathymetry and underwater object detection and imaging, are also the promising tool in seafloor characterization and classification, having several advantages over conventional single beam echosounders. The proposed approach relies on the combined, concurrent use of several techniques of multibeam sonar data processing. The first one is based on constructing the grey-level sonar images of seabed using the backscattering strength calculated for the echoes received in the consecutive beams. Then, the set of parameters describing the local region of sonar image is calculated. These include both the first and the second order statistics of the grey level, and the texture analysis. The second technique utilises the 3D model of the seabed surface, which is constructed as a set of (x, y, z) points using the detected bottom range for each beam in the multibeam system seafloor imaging procedure. For the local region of seabed surface, the descriptors like rms height and autocorrelation radius are calculated. The third technique assumes the use of a set of parameters of the multibeam echo envelope, similarly as in single beam classification. The parameters include echo energy and its statistics, as well as the set of echo shape descriptors, and are calculated for each beam allowing the estimation of their dependence on seafloor incident angle. Then, for selected parameters, the characteristic features quantitatively describing their angular dependence, like slope, or range, are calculated. Finally, the features obtained by these 3 techniques have been combined together and used in seabed supervised classification procedure based on standard classifiers. The proposed method has been tested using multibeam data records acquired from several bottom types in the Gulf of Gdańsk region. The obtained results show that application of the proposed combined approach improves the classification comparison with those of using only the one scheme of seafloor multibeam data processing.
    Źródło:
    Hydroacoustics; 2011, 14; 135-142
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractal characterisation of 30 kHz echoes from southern Baltic bottom
    Autorzy:
    Tęgowski, J.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331844.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The fractal dimension of 30 kHz echo envelope is used for characterise the bottom sediment type in Southern Baltic Sea. Two methods of the echo waveform fractal dimension calculation were applied: the autocorrelation function log-log slope method and the power spectrum log-log slope method. The results are presented and compared. They show that fractal dimension of echo envelope describes well the bottom sediments morphology and may be used as a significant descriptor in the remote sea bed classification procedures.
    Źródło:
    Hydroacoustics; 2000, 3; 15-18
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of some echo parameters to the seabed classification - methodological analysis
    Autorzy:
    Tęgowski, J.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332378.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the methodological analysis of acoustical seabed classification procedure, which aim is to define the most appropriate bottom echo parameters as an input set. Several acoustical and statistical features of echo envelope were compared with morphological features of bottom sediments and a set of parameters was proposed: integral backscattering strength, time of reverberation, radius of autocorrelation, fractal dimension, moment of inertia, and skewness. It was shown using real echoes from seafloor, that this set may be a good descriptor of sea bottom sediments and may be used in classification procedures. In addition, the spatial distribution of echo skewness within Polish Economical Zone of Baltic Sea was presented as an example and compared with sediments allocation map.
    Źródło:
    Hydroacoustics; 2001, 4; 237-240
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multibeam data processing for 3D object shape reconstruction
    Autorzy:
    Kulawiak, M.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332626.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    multibeam sonar
    3D reconstruction
    point cloud
    wrecks
    rasterization
    Opis:
    The technology of hydroacoustic scanning offers an efficient and widely-used source of geospatial information regarding underwater environments, providing measurement data which usually have the structure of irregular groups of points known as point clouds. Since this data model has known disadvantages, a different form of representation based on representing surfaces with simple geometric structures, such as edges and facets, is preferred for data featuring seabed surface relief and various underwater objects. In this paper, the authors propose a multiple-step approach to three-dimensional surface reconstruction from multibeam sonar measurements, relying on the proper application of various algorithms for noise reduction, data rasterization and classification. The results obtained by combining several different surface reconstruction algorithms with the proposed data processing technique were tested, and the strengths and weaknesses of each method were highlighted.
    Źródło:
    Hydroacoustics; 2017, 20; 105-112
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling the seafloor 3D relief and its reconstruction from multibeam sonar data
    Autorzy:
    Łubniewski, Z.
    Moszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/331622.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The simple, real-time procedure for seafloor relief reconstruction and simultaneous seabed type identification using echo data from hypothetical multibeam sonar system was proposed. The algorithm was tested using artificially generated relief and seabed type data. In the first stage, 3D surface of seafloor was generated, using the inverse Fourier transformation of the 2D spatial frequency spectrum of power law form. In the second stage, the generation. of the set of multibeam sonar data, which simulated echoes collected from seabed, was performed with account for the distances from transducer to particular surface elements, scattering coefficient and the angles of insonification. Finally, the spatial form of seabed was reconstructed using the simulated data, while bottom type was identified simultaneously using estimated angular dependence of backscattering coefficient. The obtained results showed the good performance of the proposed reconstruction procedure for artificial data and suggested verification of the algorithm using real data.
    Źródło:
    Hydroacoustics; 2001, 4; 153-156
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On algorithm details in multibeam seafloor classification
    Autorzy:
    Łubniewski, Z.
    Sęk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/331668.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    seafloor classification
    multibeam sonar
    sonar data processing
    Opis:
    Remote sensing of the seafloor constitutes an important topic in exploration, management, protection and other investigations of the marine environment. In the paper, a combined approach to seafloor characterisation is presented. It relies on calculation of several descriptors related to seabed type using three different types of multibeam sonar data obtained during seafloor sensing, viz.: 1) the grey-level sonar images (echograms) of the seabed, 2) the 3D model of the seabed surface which consists of bathymetric data, 3) the set of time domain bottom echo envelopes received in the consecutive sonar beams. The proposed methodology has been tested using field data records acquired from several bottom types in the Southern Baltic Sea. Using the examples of particular parameters, the influence on the specific manner and details regarding their calculation, i.e. the size of the applied current local window to a sonar image, on the obtained classification performance, is discussed.
    Źródło:
    Hydroacoustics; 2017, 20; 113-120
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of direct and inverse methods of satellite observations downscaling for the coastal zone area
    Autorzy:
    Chybicki, A.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331736.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    Earth observation
    land surface temperature
    sea surface temperature
    PBIM downscaling method
    surface effective emissivity
    Opis:
    The Earth observation satellite imaging systems have known limitations, especially regarding their spatial and temporal resolution. Therefore, approaches which aim to combine data retrieved from sensors of higher temporal and lower spatial resolution with the data characterized by lower temporal but higher spatial resolution are of high interest. This allows for joint utilization of the advantages of both these types of sensors. As there are several ways to achieve this goal, in this paper two approaches, direct and inverse, of downscaling the land surface temperature (LST) derived from low resolution imagery acquired by the Advanced Very High Resolution Radiometer (AVHRR) were evaluated. The applied downscaling methods utilize biophysical properties of the surface sensed using short wave infrared and thermal band. The presented algorithm evaluation was performed on the basis of a specific test case: the coastal zone area of the Gulf of Gdańsk, Poland. In this context, the objective presented in the study was to compare two methods of downscaling for a specific test case in order to evaluate how the proposed approaches cope with the specific conditions of the coastal zone area.
    Źródło:
    Hydroacoustics; 2016, 19; 55-64
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using principal component analysis and canonical discriminant analysis for multibeam seafloor characterisation data
    Autorzy:
    Łubniewski, Z.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331872.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the seafloor characterisation based on multibeam sonar data. It relies on using the integrated model and description of three types of multibeam data obtained during seafloor sensing: 1) the grey-level sonar images (echograms) of seabed, 2) the 3D model of the seabed surface which consists of bathymetric data, 3) the set of time domain bottom echo envelopes received in the consecutive sonar beams. The classification is performed by utilisation of several statistical methods applied for analysis of a set of seafloor descriptors derived from multibeam data. In the paper, the use of Principal Component Analysis (PCA), as well as Canonical Discriminant Analysis (CDA) for reduction of the seafloor parameter space dimension is presented along with the obtained results. In addition, the use of the open source World Wind Java SDK tool for implementation of imaging and mapping of seafloor multibeam data, integrated with other elements of a scene and overlaid on rich background data, is also shown.
    Źródło:
    Hydroacoustics; 2012, 15; 123-130
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D seafloor reconstruction using data from side scan and synthetic aperture sonar
    Autorzy:
    Bikonis, K.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331896.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    seafloor reconstruction
    underwater environment
    seafloor
    Opis:
    Side scan and synthetic aperture sonars are widely used imaging systems in the underwater environment. They are relatively cheap and easy to deploy, in comparison with more powerful sensors, like multibeam echosounders. Although side scan and synthetic aperture sonars does not provide seafloor bathymetry directly, their records are finally related to seafloor images. Moreover, the analysis of such images performed by human eye allows creating semi-spatial impressions of seafloor images obtained from side scan sonar echograms. In the paper, some techniques for 3D seafloor shape reconstruction from side scan and synthetic aperture sonars are presented. They are based on Shape From Shading (SFS) approach, which is one of classical problems in computer vision. The method for reconstruction of 3D seafloor relief using the information from both the currently processed and previous ping is presented. The advantage of the presented methods is their simplicity and the ability to produce the results within sequential, i.e. “one run” processing of side scan sonar image. Another algorithm relies on estimating the altitude gradient of the insonified surface from sonar data, combined with the use of dimension of shadow areas for estimation of the current elevation change. The presented results are promising and also show to some extent how the performance of the proposed algorithm might be improved in further investigation.
    Źródło:
    Hydroacoustics; 2010, 13; 25-30
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea bottom typing using fractal dimension
    Autorzy:
    Łubniewski, Z.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332284.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The article presents an attempt to apply elements of fractal analysis for the purpose of sea bottom typing. The fractal dimension was calculated as box dimension for sampled envelopes of echo signals from four types of sea bottom recorded during mobile acoustic surveys carried out in Lake Washington. The results obtained show that the simple method applied can be used for on board sea bed recognition in real time with accuracy similar to that of other methods.
    Źródło:
    Hydroacoustics; 1997, 1; 131-134
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods for quality improvement of multibeam and LiDAR point cloud data in the context of 3D surface reconstruction
    Autorzy:
    Kulawiak, M.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332451.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    multibeam sonar
    LiDAR
    3D
    point cloud
    shape reconstruction
    noise reduction
    Opis:
    Point cloud dataset is the transitional data model used in several marine and land remote-sensing applications. During further steps of processing, the transformation of point cloud spatial data to more complex models containing higher order geometric structures like edges and facets may be possible, if an appropriate quality level of input data is provided. Point cloud datasets usually contain a considerable amount of undesirable irregularities, such as strong variability of local point density, missing data, overlapping points and noise caused by scattering characteristics of the environment. For these reasons, processing such data can be quite problematic, especially in the field of object detection and threedimensional surface reconstruction. This paper is focused on applying the proposed methods for reducing the mentioned irregularities from several datasets containing 3D point clouds acquired by multibeam sonars and LiDAR scanners. The article also presents the results obtained by each method, and discusses their advantages.
    Źródło:
    Hydroacoustics; 2016, 19; 251-258
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction methods for 3D underwater objects using point cloud data
    Autorzy:
    Kulawiak, M.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332592.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    visualizing underwater objects
    3D model
    shipwrecks imaging
    Opis:
    Existing methods for visualizing underwater objects in three dimensions are usually based on displaying the imaged objects either as unorganised point sets or in the form of edges connecting the points in a trivial way. To allow the researcher to recognise more details and characteristic features of an investigated object, the visualization quality may be improved by transforming the unordered point clouds into higher order structures. There are many algorithms for constructing meshes from point clouds, some of which are more suited to processing data obtained from particular sources. This article presents the application of several methods for generating 3D models from point clouds for the purpose of reconstructing underwater objects, such as shipwrecks. The article presents the results obtained with each method and discusses possible ways of improving the quality of produced meshes.
    Źródło:
    Hydroacoustics; 2015, 18; 95-102
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D imaging of underwater objects using multibeam data
    Autorzy:
    Kulawiak, M.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332737.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    One of the main applications of multi-beam sonars is high-resolution bathymetry measurement, as well as the detecting and imaging of underwater objects, such as shipwrecks. In order to ensure that the visual quality is good enough for the researcher to investigate the object in more detail, an approach relying on the construction of the threedimensional model of an imaged object – e.g. consisting of nodes, edges and plane elements (facets) – is needed. Preceded by the short State-of-the-Art review, the applications of selected algorithms for three-dimensional seafloor-surface and underwater-object shape reconstruction have been presented. Two types of algorithms were investigated in the context of real-time application possibility; namely, raster height map, as well as 2D Delaunay triangulation. The presented preliminary results are promising both with respect to reconstructed 3D shape quality and to algorithm computational complexity, allowing for realtime mode applications.
    Źródło:
    Hydroacoustics; 2014, 17; 123-128
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential of Polish R&D industry in the context of prototyping, design, development and control of a dedicated national satellite SAR system for marine ecosystem monitoring Technical paper - preliminary study
    Autorzy:
    Chybicki, A.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332762.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    SAR
    satellite
    system
    observations
    maritime
    Opis:
    Space technology is currently one of the most important elements in the advance of information societies and knowledge-based economies all over the world. The European Space Agency (ESA) is in the focal point of European space activities, while the European Union provides strong financial support for the development of space technologies and applications in its flagship programs. In a domestic scope, the Polish Space Agency (POLSA) is a national aeronautics entity responsible for activities related to development of technologies of the national space sector. Recently, one of the activities which POLSA aims to establish, is the programme of building a system of satellite SAR observations dedicated for Polish users; such as administration, civilian services, and Polish scientific and research entities, that would expand potential use of satellite technologies among numerous Polish beneficiaries. In the context mentioned above, the paper describes the architecture and functional components of an exemplary satellite SAR system, along with the potential of Polish entities to develop such technology.
    Źródło:
    Hydroacoustics; 2016, 19; 49-54
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea floor classification using multibeam sonar
    Autorzy:
    Łubniewski, Z.
    Chybicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332796.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    sea floor classification
    multibeam sonar
    hydroacoustics
    Opis:
    The paper presents the method of seabed identification and classification using multibeam sonar echoes. The proposed approach is based on calculation of a set of parameters of an echo envelope. The parameters are extracted for each consecutive beam allowing the estimation of their dependence on the seafloor incident angle, and then the relation between seabed type and calculated echo parameters and its angular dependence is investigated. The paper concerns the experiment which has been carried out in Gdansk Bay in November 2008, and some comparisons of the results with those obtained during previous experiment in September 2007. The results for several bottom types are presented and discussed. It was confirmed that the information extracted from multibeam seafloor sensing data, e.g. "water column" recordings, may be useful in seafloor characterisation.
    Źródło:
    Hydroacoustics; 2009, 12; 127-132
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D object shape reconstruction from underwater multibeam data and over ground LiDAR scanning
    Autorzy:
    Kulawiak, M.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/260564.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    multibeam sonar
    laser scanning
    three dimensional reconstruction
    point cloud
    triangulation
    Opis:
    The technologies of sonar and laser scanning are an efficient and widely used source of spatial information with regards to underwater and over ground environment respectively. The measurement data are usually available in the form of groups of separate points located irregularly in three-dimensional space, known as point clouds. This data model has known disadvantages, therefore in many applications a different form of representation, i.e. 3D surfaces composed of edges and facets, is preferred with respect to the terrain or seabed surface relief as well as various objects shape. In the paper, the authors propose a new approach to 3D shape reconstruction from both multibeam and LiDAR measurements. It is based on a multiple-step and to some extent adaptive process, in which the chosen set and sequence of particular stages may depend on a current type and characteristic features of the processed data. The processing scheme includes: 1) pre-processing which may include noise reduction, rasterization and pre-classification, 2) detection and separation of objects for dedicated processing (e.g. steep walls, masts), and 3) surface reconstruction in 3D by point cloud triangulation and with the aid of several dedicated procedures. The benefits of using the proposed methods, including algorithms for detecting various features and improving the regularity of the data structure, are presented and discussed. Several different shape reconstruction algorithms were tested in combination with the proposed data processing methods and the strengths and weaknesses of each algorithm were highlighted.
    Źródło:
    Polish Maritime Research; 2018, 2; 47-56
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seafloor characterisation using multibeam sonar echo signal processing and image analysis
    Autorzy:
    Łubniewski, Z.
    Stepnowski, A.
    Chybicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331997.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The authors propose the approach to multibeam seafloor characterisation which relies on the combined, concurrent use of two different techniques of multibeam sonar data processing. The first one is based on constructing the grey-level sonar images of seabed using the echoes received in the consecutive beams. Then, the parameters describing the local region of sonar image, namely, the local standard deviation of a grey level, and the slope of a local autocorrelation function of a grey level, are calculated. The second technique assumes the use of a set of parameters of the multibeam echo envelope, similarly as in single beam classification. For selected parameters, namely, for echo envelope moment of inertia and for echo envelope fractal dimension, the slope of their angular dependence is calculated. Finally, the quantities obtained by these 2 techniques have been combined together and the multidimensional distributions of sets of them have been analysed in the context of seabed classification procedure. The approach has been tested using multibeam data records acquired from several bottom types in the Gulf of Gdańsk region. The preliminary results show that application of the proposed combined approach should improve the classification performance in comparison with that of using only the one scheme of seafloor multibeam data processing.
    Źródło:
    Hydroacoustics; 2010, 13; 171-176
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie odpowiedzi impulsowej dla rozpraszania wstecznego dna morskiego
    Modelling of the impulse response for backscattering from seafloor
    Autorzy:
    Łubniewski, Z.
    Moszyński, M.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332215.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The modelling of surface and volume backscattering of a single-beam echosounder signals on sea fioor using impulse response approach is presented. Kirchhoff (tangent plane) approximation is used in surface scattering modelling for approximately fiat sea bottom and smal! perturbation theory is applied to describe the volume backscattering. The influence of bottom physical features as well as the system parameters (operating frequency, beamwidth) on the shape of the sea bed impulse response and echo waveform is investigated. The results have revealed the differences for particular cases of bottom and acoustic system 's parameters and they are important for validation of newly developed algorithms of echo signals processing for bottom classification.
    Źródło:
    Hydroacoustics; 2000, 3; 35-38
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparision of two algorithms of evaluating fractal dimension for sea bottom typing
    Autorzy:
    Łubniewski, Z.
    Kozicki, S.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332344.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The fractal dimension of received echo envelope is a useful parameter in a sea bottom classification procedure. As fractal structure of bottom is believed to transfer onto the shape of echo envelope, fractal dimension may describe properly some physical features of seabed, as surface roughness or complexity of layered structure. The paper presents and compares the results of two methods of fractal dimension calculation from echo envelope given as finite set of discrete values. The first method evaluates box dimension and the second is based on the relation between fractal dimension and Lipschitz exponent, which describes some properties of autocorrelation junction of investigated signal. The obtained results show that at least one type of fractal dimension method may be useful in a sea bottom recognition task.
    Źródło:
    Hydroacoustics; 1999, 2; 107-112
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of inverse filtering techniques in the sea bottom recognition
    Autorzy:
    Łubniewski, Z.
    Moszyński, M.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332346.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents the newly developed approach to the sea bottom recognition and identification, which uses inverse filtering techniques to extract bottom scattering properties from a single-beam echosounder signal. Using simple physical model, the developed inverting procedure allows to remove the influence of pulse shape, beam pattern and model geometry upon the backscattered echo. 11permits to obtain the seabed impulse response which is directly related to the function describing the angular dependence of bottom reverberation coefficient. Various direct and iterative inverse methods can be applied to the mentioned problem. The results of testing the method using echoes from several bottom types are in agreement with the predictions of theoretical models. Moreover, the proposed bottom classification procedure uses simple parameters of deconvolved function and the obtained classification results are better than those of ofher bottom identification methods of normal incidence.
    Źródło:
    Hydroacoustics; 1999, 2; 95-100
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Maritime awareness and emergency management real time system using remotely accessible GIS technology
    Autorzy:
    Łubniewski, Z.
    Partyka, A.
    Stepnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332721.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper concerns the concept of the application of the latest achievements in both information technology and remote sensing, including underwater acoustic sensors, for maritime awareness and emergency management supporting in a case of hazard of a different kind, e.g. terrorism, pollution and ecological catastrophes, or natural disasters. The real-time, remotely accessible marine GIS is dedicated for instantaneous integration, processing and multi aspect visualisation, in a form of time variable views and maps, of the data acquired by various types of sensors. The paper presents the prototype application of the marine GIS for remotely accessible, instantaneous detection, localisation and monitoring of sea water pollution aggregations, e.g. oil spills, discharge material plumes etc. The developed system is also capable of performing the instantaneous prediction of the pollutants' behaviour, i.e. the dislocation and spreading of an oil spill, in the nearest future, using the relevant physical models. The system utilises the SQL database for data storage and the SVG language for geographical objects remote presentation, and requires only the WWW browser and SVG viewer on the client side.
    Źródło:
    Hydroacoustics; 2005, 8; 105-110
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Shape From Shading Technique for Side Scan Sonar Images
    Autorzy:
    Bikonis, K.
    Moszynski, M.
    Lubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/258963.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    side scan sonar data processing shape from shading
    Opis:
    Digital signal processing technology has revolutionized a way of processing, visualisation and interpretation of data acquired by underwater systems. Through many years side scan sonars were one of the most widely used imaging systems in the underwater environment. Although they are relatively cheap and easy to deploy, more powerful sensors like multibeam echo sounders and sonars are widely used today and deliver 3D bathymetry of sea bottom terrain. Side scan sonar outputs data usually in a form of grey level 2D acoustic images but the analysis of such pictures performed by human eye allows creating semi-spatial impressions of seafloor relief and morphology. Hence the idea of post-processing the side scan sonar data in a manner similar to human eye to obtain 3D visualisation. In recently developing computer vision systems the shape from shading approach is well recognized technique. Applying it to side scan sonar data is challenging idea used by several authors. In the paper, some further extensions are presented. They rely on processing the backscattering information of each footprint (pixel in sonar image) along with its surroundings. Additionally, a current altitude is estimated from the size of shadow areas. Both techniques allow constructing 3D representation of sea bottom relief or other investigated underwater objects.
    Źródło:
    Polish Maritime Research; 2013, 3; 39-44
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterizing surface and air temperature in the Baltic Sea coastal area using remote sensing techniques and GIS
    Autorzy:
    Chybicki, A.
    Kulawiak, M.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/963420.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    remote sensing
    coastal zone
    AVHRR
    GIS
    surface temperature
    air temperature
    vegetation index
    Opis:
    Estimation of surface temperature using multispectral imagery retrieved from satellite sensors constitutes several problems in terms of accuracy, accessibility, quality and evaluation. In order to obtain accurate results, currently utilized methods rely on removing atmospheric fluctuations in separate spectral windows, applying atmospheric corrections or utilizing additional information related to atmosphere or surface characteristics like atmospheric water vapour content, surface effective emissivity correction or transmittance correction. Obtaining accurate results of estimation is particularly critical for regions with fairly non-uniform distribution of surface effective emissivity and surface characteristics such as coastal zone areas. The paper presents the relationship between retrieved land surface temperature, air temperature, sea surface temperature and vegetation indices (VI) calculated based on remote observations in the coastal zone area. An indirect comparison method between remotely estimated surface temperature and air temperature using LST/VI feature space characteristics in an operational Geographic Information System is also presented.
    Źródło:
    Polish Maritime Research; 2016, 1; 3-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using wavelet techniques for multibeam sonar bathymetry data compression
    Autorzy:
    Chybicki, A.
    Łubniewski, Z.
    Moszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/331892.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Multibeam sonars are widely used in applications like high resolution bathymetry measurements or underwater object imaging. One of the significant problems in multibeam sensing of the marine environment is large amount of data which must be transmitted from the sonar processing unit to an operator station using a limited bit rate channel. For instance, such a situation would be in the case when the multibeam sonar was mounted on the autonomous underwater vehicle operating on large depths and transmitting the data to the operator station using acoustic channel. In this context, the authors propose a method for multibeam sonar data size reduction. It relies on the use of wavelet decomposition technique combined with run-length and Huffman coding. The method was applied for lossy compression of raw bathymetry data which had been generated by a multibeam sonar processing unit in a form of a set of points in three-dimensional space. The performed tests revealed that without introducing the substantial distortion into the processed bathymetry data, the proposed approach allows to obtain better compression ratios than in the case of using standard lossy JPEG-like compression techniques.
    Źródło:
    Hydroacoustics; 2010, 13; 31-38
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-frequency analysis of seabed echoes using wavelet transform
    Autorzy:
    Moszyński, M.
    Stepnowski, A.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332256.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The methods based on analysis of boftom backscatter data from a single-beam echosounder have achieved special attention in the seabed identification problem. due to their simplicity over ofher more sophisticated acoustic techniques like side scan sonar or multibeam surveys. The majority of these methods analyses the scattering phenomena mostly in time domain (echo envelope). However, the frequency echo components carry concurrent information, which can be also used in boftom characterisation. The paper proposes the time-frequency approach to the boftom characterisation and presents the application of Wigner- Ville Distribution and wavelet transform of boftom backscatter data. The examples of continuous and discrete wavelet transforms of actual echo envelopes received at three boftom types for three different operating frequencies (38, 120 and 420 kHz) are shown. Their characteristic features are compared and parameters for classification schemes are proposed. The results of classification procedure are good with comparison with those of ofher simple acoustic methods.
    Źródło:
    Hydroacoustics; 1999, 2; 85-90
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of 3D shape from sidescan sonar images using shape from shading technique
    Autorzy:
    Moszyński, M.
    Bikonis, K.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332701.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Side scan sonar (SSS) is one of the most widely used imaging systems in the underwater environment. It is relatively cheap and easy to deploy in comparison with more powerful sensors like multibeam echosounder or synthetic aperture sonar. Although, the SSS does not provide directly the seafloor bathymetry measurements. Its outputs are usually in a form of grey level acoustic images of seafloor. However, the analysis of such images performed by human eye allows creating semi-spatial impressions on seafloor relief and morphology. The 3D shape reconstruction from 2D images using SFS approach is one of classical problems in computer vision. In the paper, the method based on Shape From Shading (SFS) technique for SSS images processing is presented. The 3D seafloor relief is reconstructed using the information from both the currently processed and previous ping. The seafloor backscattering coefficient dependence on an incident angle, which is needed in the applied SFS algorithm scheme, is being estimated in the experimental way, i.e. by analysis of SSS image contents for the flat seabed region.
    Źródło:
    Hydroacoustics; 2013, 16; 181-188
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel approach to bottom scattering using a narrow acoustic beam
    Autorzy:
    Zieliński, A.
    Tegowski, J.
    Lubniewski, Z.
    Demkowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332113.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The acoustic response of the ocean bottom to a probing pulse is a complex and complicated process. This process is influenced by with the form of an acoustic transmitting/receiving beam and by the physical processes involved in sound scattering from the surface and the volume of the ocean bottom. The complexities of these phenomena often obscure an intuitive understanding of the underlying principles of echo formation and its reception. In this paper, we propose a simplistic model for this complex process using filter theory. The bottom is represented as a surface reflector with an acoustic wave front sweeping over it with time-varying velocity. The impulse response of a smooth flat bottom is characteristic of a low pass-filter that will greatly attenuate the impinging high frequency pulse. On the other hand, bottom undulations will modulate the reflected signal such that it can be represented by the impulse response of a band-pass filter. The received echo can be represented as the response of such filter to a high frequency pulse. The characteristics and amplitude of the echo are dependent on frequency spectrum overlap between the transmitted pulse spectrum and the filter frequency response. In the paper, we discuss several cases of interest with the intent to provide a solid intuitive understanding of the echo formation from the system point of view.
    Źródło:
    Hydroacoustics; 2004, 7; 253-258
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of satellite imagery and GIS tools for land surface temperature estimation and verification
    Autorzy:
    Chybicki, A.
    Łubniewski, Z.
    Niedzielko, J.
    Ruciński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/331533.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Land surface temperature (LST) plays an important role in many land-surface processes on regional as well on global scales. It is also a good indicator of energy flux phenomena and is used as a parameter in various Earth observation related studies. However, LST estimation based on processing and utilisation of satellite derived data constitutes several problems in terms of time limitations, accessibility, atmospheric influence etc. The aim of the study was to verify and compare the algorithms especially in the context of minimalisation of errors in LST estimation by satellite observation using various means of GIS data processing and integration. Also, the indirect verification of the LST estimation methods, based on the utilisation of statistics and dependencies of LST, NDVI and air temperature values has been presented and discussed. The presented work has the form of a case study, and due to limited amount of verification data used in the current stage of the investigation, the results should be treated as preliminary. The developed GIS solution for integrating spatial data from many sources needed in the course of this study is also presented.
    Źródło:
    Hydroacoustics; 2013, 16; 19-28
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel method for archiving multibeam sonar data with emphasis on efficient record size reduction and storage
    Autorzy:
    Moszynski, M.
    Chybicki, A.
    Kulawiak, M.
    Lubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/260572.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sonar
    compression
    storage
    reduction
    efficiency
    Opis:
    Over the past few years considerable advances in sonar technology, spatial positioning capabilities and computer processing power have lead to significant improvements in mapping, imaging and technologies of seafloor exploration. Recently, modern multibeam echosounder systems (MBES) capable of recording backscatter data for the whole water column, not just for the seabed, have become available thus providing data allowing for visualization and analysis of objects other than the seabed such as single fish, fish schools or pollution. Unlike bathymetric sonars, which only capture the seafloor, multibeam systems produce very large amounts of data during surveys. Because of this, storing the data collected during hydrographic or scientific cruises becomes a crucial problem. In this context, the paper proposes a new approach for efficient reduction and storage of MBES records. The results of a sample implementation of the algorithm being tested on several different sets of MBES data are also discussed.
    Źródło:
    Polish Maritime Research; 2013, 1; 77-86
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algorytmy analizy, przetwarzania i wizualizacji danych z sonaru wielowiązkowego w rozproszonych systemach GIS
    Analysis, processing and visualization algorithms for mutlibeam sonar data in distributed GIS systems
    Autorzy:
    Chybicki, A.
    Kulawiak, M.
    Kamiński, Ł.
    Łubniewski, Z.
    Dąbrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/366246.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
    Tematy:
    systemy wielowiązkowe
    echosonda
    telemonitoring morski
    multibeam systems
    sonar
    seas and ocean monitoring and sensing
    Opis:
    Katedra Systemów Geoinformatycznych prowadzi badania naukowe związane z zastosowaniem nowych technologii implementacji Systemów Informacji Przestrzennej (GIS) w różnych zastosowaniach, a szczególnie w aplikacjach związanych z obszarami morskimi. Prowadzone są też prace badawcze związane z analizą i przetwarzaniem danych dla systemów GIS, ze szczególnym uwzględnieniem danych otrzymywanych z sonarów wielowiązkowych. Niniejszy artykuł stanowi ogólny opis prac badawczych związanych z telemonitoringiem morskim prowadzonych w Katedrze Systemów Geoinformatycznych Politechniki Gdańskiej.
    Research carried out by The Department of Geoinformatics of Gdansk University of Technology focuses on processing, analysis and visualization of information related to marine and land environment. In particular, the research activities include: Web-based interactive Geographical Information Systems (GIS), 3D imaging of underwater objects using intelligent methods of recognition and mapping of seafloor, acoustic monitoring and population assessment of marine living resources. This paper describes the most important directions of the Department's research activity in the context of marine habitat monitoring.
    Źródło:
    Polish Hyperbaric Research; 2009, 1(26); 19-26
    1734-7009
    2084-0535
    Pojawia się w:
    Polish Hyperbaric Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System informacji geograficznej i techniki obrazowania satelitarnego w zastosowaniu do analizy i wizualizacji infrastruktur krytycznych i ich zagrożeń
    Geographic information system and satellite imaging techniques applied for analysis and visualisation of critical infrastructures and their threats
    Autorzy:
    Bruniecki, K.
    Stepnowski, A.
    Łubniewski, Z.
    Kulawiak, M.
    Buszke, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/210821.pdf
    Data publikacji:
    2010
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    geoinformatyka
    GIS
    telemonitoring
    infrastruktury krytyczne
    obserwacje satelitarne
    geoinformatics
    critical infrastructures
    satellite observations
    Opis:
    W chwili obecnej faktem jest występowanie zarówno coraz liczniejszych zdarzeń katastroficznych powodowanych przez siły przyrody, jak też nieustanny wzrost intensywności ataków terrorystycznych na obiekty publiczne i przemysłowe. Zagrożenia tego rodzaju stają się coraz poważniejsze w odniesieniu do wielu, także tych uważanych do tej pory za bezpieczne rejonów świata, w tym Europy i Polski. Sytuacja taka wymaga podejmowania zdecydowanych i skutecznych działań, tak w skali międzynarodowej, jak i regionalnej, w celu zabezpieczenia ludności oraz majątku państwa przed tego typu zagrożeniami oraz ich skutkami. W tym kontekście, należy podkreślić istotną rolę nowatorskich narzędzi z zakresu technologii informacyjnych w przewidywaniu i ocenie zagrożeń oraz wspomaganiu minimalizacji ewentualnych strat. W artykule przedstawiono sieciowy system informacji przestrzennej do analizy i wizualizacji infrastruktur krytycznych (IK) oraz ich zagrożeń. System ten umożliwia gromadzenie, integrację, przetwarzanie, wykonywanie różnorakich analiz oraz wizualizację danych przestrzennych, w szczególności dotyczących IK miasta z różnych sektorów. System dla autoryzowanego użytkownika jest dostępny zdalnie, za pośrednictwem sieci Web z poziomu zwykłej przeglądarki internetowej. Narzędziem do wprowadzania danych na temat IK do systemu jest moduł analiz oparty na technologii CARVER2™. Zakłada ona porównywanie odmiennych typów infrastruktur przy zastosowaniu tych samych, wielorakich kryteriów oceny IK, takich jak ważność obiektu, dostępność dla ataku, odtwarzalność, wrażliwość na poszczególne rodzaje ataków. Wprowadzone do systemu dane przetwarzane są przez szereg procedur analiz przestrzennych w odniesieniu do różnych rodzajów zagrożeń, jak np. określanie strefy zagrożenia dla ataku bombowego czy chemicznego, czy granic obszaru zalanego w wyniku wycieku lub powodzi na podstawie danych o lokalizacji, rozmiarze i szybkości wycieku, numerycznego modelu terenu oraz modelu przemieszczania się i absorpcji materiału przez podłoże. System oferuje także inne narzędzia przetwarzania i analiz danych przestrzennych, jak np. narzędzia do interpolacji przestrzennej za pomocą metody odwrotnej odległości bądź funkcji sklejanych. Przedstawiono także koncepcję rozbudowy systemu o jego integrację z sensorami satelitarnej obserwacji Ziemi (Earth Observation - EO) oraz automatyczne przetwarzanie obrazów satelitarnych w celu detekcji i analizy zagrożeń. Omówiono źródła danych satelitarnych użytecznych w tym zastosowaniu oraz planowane do wykorzystania opracowane przez Europejską Agencję Kosmiczną techniki przetwarzania i udostępniania obrazów, takie jak Service Support Environment - SSE. Przedstawiony system jest aktualnie wdrażany do użytkowania przez Wydział Zarządzania Kryzysowego i OchronyLudności Urzędu Miejskiego w Gdańsku, gdzie stanowić będzie cenne narzędzie wspomagające ochronę infrastruktur krytycznych przed zagrożeniami różnego rodzaju.
    At present, the increase in catastrophic natural disasters as well as events of terrorist attacks against public and industrial objects is observed. Threats of this kind become more realistic and serious with respect to many regions and places in the world considered relatively safe previously, including Europe and Poland. This situation requires determined and effective actions, both in international and regional scale, for protection of people and critical infrastructures against such threats and their consequences. Within this context, in prediction of hazards and to support the activities for minimizing their results, the sort of new Information Technology achievements and solutions may be a useful aid. In the paper, the Web-Based Geographic Information System for assessment and visualization of CIs and its hazards is presented. The system allows storing, integration, processing, analysis and visualisation of spatial data on Gdańsk city area, including different CI sectors. The system is accessible remotely for an authorised user, from the Web browser level. The tool for entering the CI data to the system is implemented as the analysis module based on the CARVER2™ technology. It assumes comparison of different CI types using the same set of criteria, like criticality, accessibility, recoverability or susceptibility for different threats. Spatial data entered to the system may be processed by a set of spatial analysis procedures with respect to various threats, for instance, detection of hazard zone for a blast or chemical attack, or localisation the area affected or threaten by flood or leak, using the data on localisation, amount and speed of the leak, digital elevation model (DEM) as well as the liquid mass absorption and movement model. System offers also other tools for processing and analysis of spatial data, like spatial interpolation by inverse distance or spline methods. Presented GIS can be integrated with satellite imagery data. The main source of satellite imagery will be 1.5-m L-Band Metop-HRTP Satellite Ground Station and the EUMETCast system. It is very important to obtain the data from different satellite platforms, as different threats can be detected by different sensors. Some processing techniques and data delivery mechanisms, developed by European Space Agency, like Service Support Environment are discussed, since SSE can be very useful in obtaining satellite data from other satellites sources. Examples of threats which can be detected, by processing satellite imagery, are presented along with information about potential types of satellites, which may be practical in detecting particular threats. The system is used by the Crisis Management Department of Gdańsk City Hall as a useful tool supporting CI protection against different types of threats.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2010, 59, 2; 265-283
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geographic information system for remote integration of diverse under-water acoustic sensor data
    Autorzy:
    Chybicki, A.
    Kamiński, Ł.
    Lubniewski, Z.
    Bruniecki, K.
    Kulawiak, M.
    Dąbrowski, J.
    Moszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/332542.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    geographic information system (GIS)
    acoustic sensor data
    under-water acoustic
    Opis:
    Maritime and port areas throughout the world are exposed to many different hazards, like pollution, terrorism and natural disasters. Early detection, identification and preparation of appropriate response strategies is especially important in the case of semi-enclosed basins like the Baltic Sea, mainly due to the marine ecosystems' continuous absorption of pollutants including oil, heavy metals and chemicals. Many of those agents are characterised by great toxicity and cause devastation of the natural environment. The huge development in the information technology provides the means and possibilities for much faster and more efficient access to survey data, allowing their remote, nearly real-time management, processing and visualisation. Several approaches and techniques of measurements are available in marine environment monitoring. These consist of direct sampling, airborne and satellite imagery, hydrological measurements using CTD probes, remote sensing with the use of electromagnetic waves, acoustic methods based on the data acquired by multibeam systems, side-scan sonars and singlebeam echosounders.
    Źródło:
    Hydroacoustics; 2009, 12; 17-24
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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