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    Wyświetlanie 1-7 z 7
    Tytuł:
    Landsat and Sentinel-2 images as a tool for the effective estimation of winter and spring cultivar growth and yield prediction in the Czech Republic
    Autorzy:
    Jelinek, Z.
    Kumhalova, J.
    Chyba, J.
    Wohlmuthova, M.
    Madaras, M.
    Kumhala, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082908.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    satellite sensors
    agriculture
    satellite imagery
    wheat varieties
    Opis:
    The influence of climate and topography on crop condition and yield estimates is most effectively monitored by non-invasive satellite imagery. This paper evaluates the efficiency of free-access Sentinel 2 and Landsat 5, 7 and 8 satellite images scanned by different sensors on wheat growth and yield prediction. Five winter and spring wheat cultivars were grown between 2005 and 2017 in a relatively small 11.5 ha field with a 6% slope. The normalized difference vegetation index was derived from the satellite images acquired for later growth phases of the wheat crops (Biologische Bundesanstalt, Bundessorenamt and Chemical industry 55 – 70) and then compared with the topography wetness index, crop yields and yield frequency maps. The results showed a better correlation of data obtained over one day (R2 = 0.876) than data with a one-day delay (R2 = 0.689) using the Sentinel 2 B8 band instead of the B8A band for the near-infrared part of electromagnetic spectrum in the normalized difference vegetation index calculation.
    Źródło:
    International Agrophysics; 2020, 34, 3; 391-406
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of algorithms for satellite attitude determination using data from visual sensors
    Autorzy:
    Narkiewicz, Janusz
    Sochacki, Mateusz
    Rodacki, Adam
    Grabowski, Damian
    Powiązania:
    https://bibliotekanauki.pl/articles/2086831.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    space
    navigation
    attitude determination
    visual sensors
    przestrzeń
    nawigacja
    determinacja postawy
    czujnik wizualny
    Opis:
    The objective of the research was to investigate the efficiency of selected methods of data fusion from visual sensors used on-board satellites for attitude measurements. Data from a sun sensor, an earth sensor, and a star tracker were fused, and selected methods were applied to calculate satellite attitude. First, a direct numerical solution, a numerical and analytical solution of the Wahba problem, and the TRIAD method for attitude calculation were compared used for integrating data produced by a sun sensor and an earth sensor. Next, attitude data from the star tracker and earth/sun sensors were integrated using two methods: weighted average and Kalman filter. All algorithms were coded in the MATLAB environment and tested using simulation models of visual sensors. The results of simulations may be used as an indication for the best data fusion in real satellite systems. The algorithms developed may be extended to incorporate other attitude sensors like inertial and/or GNSS to form a complete satellite attitude system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137935, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Yield variability prediction by remote sensing sensors with different spatial resolution
    Autorzy:
    Kumhálová, Jitka
    Matějková, Štěpánka
    Powiązania:
    https://bibliotekanauki.pl/articles/972704.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    : satellite images
    greenseeker handheld crop
    sensor
    plant growth modelling
    phenological phases
    spectral
    index
    Opis:
    Currently, remote sensing sensors are very popular for crop monitoring and yield prediction. This paper describes how satellite images with moderate (Landsat satellite data) and very high (QuickBird and WorldView-2 satellite data) spatial resolution, together with GreenSeeker hand held crop sensor, can be used to estimate yield and crop growth variability. Winter barley (2007 and 2015) and winter wheat (2009 and 2011) were chosen because of cloud-free data availability in the same time period for experimental field from Landsat satellite images and QuickBird or WorldView-2 images. Very high spatial resolution images were resampled to worse spatial resolution. Normalised difference vegetation index was derived from each satellite image data sets and it was also measured with GreenSeeker handheld crop sensor for the year 2015 only. Results showed that each satellite image data set can be used for yield and plant variability estimation. Nevertheless, better results, in comparison with crop yield, were obtained for images acquired in later phenological phases, e.g. in 2007 – BBCH 59 – average correlation coefficient 0.856, and in 2011 – BBCH 59-0.784. GreenSeeker handheld crop sensor was not suitable for yield estimation due to different measuring method.
    Źródło:
    International Agrophysics; 2017, 31, 2; 195-202
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technologia MEMS w nawigacji i monitoringu pojazdów
    MEMS Sensors in Car Navigation and Car Fleet Management
    Autorzy:
    Uradziński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/152259.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    system GPS
    nawigacja inercjalna
    nawigacja pojazdów
    nawigacja satelitarna
    integracja systemów INS/GPS
    akcelerometr
    żyroskop
    technologia MEMS
    GPS
    inertial navigation
    car navigation
    satellite navigation
    INS/GPS integration
    accelerometer
    gyro
    MEMS sensors
    Opis:
    W artykule przedstawiono najnowocześniejsze rozwiązania konstrukcyjne czujników inercjalnych, stanowiących wraz z systemem GPS zintegrowany system nawigacyjny. Odkąd systemy INS są w stanie pracować w warunkach, w których występuje ograniczony dostęp do sygnału satelitarnego GPS, wydają się być one bardzo dobrym uzupełnieniem i potencjalną alternatywą nawigacyjnych systemów satelitarnych. Trendy w kierunku zintegrowania obu systemów związane są ściśle z uzyskaniem wysokiej dokładności wyznaczanej pozycji, obniżeniem wagi oraz kosztów. Szybki rozwój technologii MEMS na pewno sprosta tym wszystkim wymaganiom i w niedalekiej przyszłości wejdzie zdecydowanie w skład kompletnego systemu nawigacyjnego pojazdu.
    The latest solutions concerning inertial navigation systems are presented in the paper. INS sensors can be easily bounded up with GPS system to build integrated navigation system. Since INS devices can work in situations where there is a GPS signal degradation, they seem to be ideal supplement and potential choice for navigation systems. For certain, this technology will realize all the requirements concerning: getting high accuracy, reducing weight and costs and above all - increasing reliability of working. Fast development of MEMS sensors will for sure be up to all these requirements and in the near future they will be definitely used in complete car navigation system.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 11, 11; 50-52
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The possibility of vessel motion data use for high resolution satellite SAR image focusing
    Autorzy:
    Dimc, F.
    Cicuendez, J. I.
    Greidanus, H.
    Perkovic, M.
    Gucma, M.
    Silva, V.
    Duczkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/359062.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    high resolution SAR imaging
    integrated motion sensors
    Opis:
    Maritime surveillance from space is useful for many applications, such as fisheries control, maritime border control and maritime security. A new generation of satellite-borne Synthetic Aperture Radars is able to provide resolutions of down to 1 meter. In the case of maritime targets, however, their motions lead to blurring in the SAR images, so these high resolutions cannot be attained. Scientific research into how to surmount the existing limits on the use of high-resolution images for maritime surveillance would be of great utility. In this context, high resolution SAR data were collected from ships that have been fitted with motion sensors in order to understand vessel motion impact on detection and recognition capability.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 16-19
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal navigation for blind people
    Autorzy:
    Marzec, Paweł
    Kos, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2090710.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blind/visually impaired person
    GPS
    infrared matrix
    infrared sensors
    low-energy measurement systems
    mobile robots
    satellite navigation
    thermal navigation
    osoba niewidoma
    osoba niedowidząca
    matryca podczerwieni
    czujniki podczerwieni
    systemy pomiarowe niskoenergetyczne
    roboty mobilne
    nawigacja satelitarna
    nawigacja termiczna
    Opis:
    This article presents a system of precise navigation for a visually impaired person which uses GPS navigation and an infrared sensor in the form of an infrared matrix. The presented system allows determining the orientation and distance of a blind person relative to a selected object, e.g. a wall or road edge. The application of the above solution facilitates a significant increase in the accuracy of determining the position of a blind person compared to the accuracy offered by commonly used ground satellite devices. The system uses thermal energy accumulated in the environment without the need to generate additional signals. The main parts of the system are a simple infrared matrix, data processing system and vibrating wristband. Messages and navigation warnings are sent to a blind person in the form of a vibration code. The article describes the method of determining the path of a specified width and distance from the wall of a building, curb, etc., along which a blind person should move. The article additionally describes the method of determining the orientation of a blind person depending on the selected object. Such a method facilitates verifying whether the visually impaired person is moving according to the indicated direction. The method can also be used to navigate mobile robots. Due to the use of natural energy for data registration and processing, the mobile navigation system can be operated for a long time without the need to recharge the battery.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136038, 1--11
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal navigation for blind people
    Autorzy:
    Marzec, Paweł
    Kos, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2173567.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blind/visually impaired person
    GPS
    infrared matrix
    infrared sensors
    low-energy measurement systems
    mobile robots
    satellite navigation
    thermal navigation
    osoba niewidoma
    osoba niedowidząca
    matryca podczerwieni
    czujniki podczerwieni
    systemy pomiarowe niskoenergetyczne
    roboty mobilne
    nawigacja satelitarna
    nawigacja termiczna
    Opis:
    This article presents a system of precise navigation for a visually impaired person which uses GPS navigation and an infrared sensor in the form of an infrared matrix. The presented system allows determining the orientation and distance of a blind person relative to a selected object, e.g. a wall or road edge. The application of the above solution facilitates a significant increase in the accuracy of determining the position of a blind person compared to the accuracy offered by commonly used ground satellite devices. The system uses thermal energy accumulated in the environment without the need to generate additional signals. The main parts of the system are a simple infrared matrix, data processing system and vibrating wristband. Messages and navigation warnings are sent to a blind person in the form of a vibration code. The article describes the method of determining the path of a specified width and distance from the wall of a building, curb, etc., along which a blind person should move. The article additionally describes the method of determining the orientation of a blind person depending on the selected object. Such a method facilitates verifying whether the visually impaired person is moving according to the indicated direction. The method can also be used to navigate mobile robots. Due to the use of natural energy for data registration and processing, the mobile navigation system can be operated for a long time without the need to recharge the battery.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136038
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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