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Wyświetlanie 1-5 z 5
Tytuł:
Technologia lotniczego skanowania laserowego jako źródło danych w półautomatycznej inwentaryzacji lasu
Airborne Laser Scanner technology as a source of data for semi-automatic forest inventory
Autorzy:
Stereńczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1009259.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy
inwentaryzacja lasu
inwentaryzacja polautomatyczna
skanowanie laserowe
fotogrametria
lidar
technika LIDAR zob.lidar
urzadzenie LIDAR zob.lidar
semi−automatic forest inventory
photogrammetry
forest management
Opis:
Airborne Laser Scanner (ALS) becomes a new tool acquiring very accurate data about forest environment. Basing on this data new methods of forest parameter extraction become available. Quality of the results of automatic methods and level of correlation to the field measurements allows presuming that in the future LIDAR can become an important tool in semi−automatic method of forest inventory.
Źródło:
Sylwan; 2010, 154, 02; 88-99
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie taksonomicznej analizy danych lotniczego skanowania laserowego do rozpoznania pionowej struktury drzewostanu i jej przestrzennej zmienności
Taxonomic analysis of airborne laser scanning data for the recognition of stand vertical structure and its spatial variability
Autorzy:
Będkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/979264.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
pinus sylvestris
forest stand
spatial structure
segmentation
taxonomic analysis
LiDAR
Opis:
The aim of the research was to develop and verify the usefulness of the algorithm for grouping multi−feature objects known as Ward’s taxonomic method for distinguishing homogeneous spatial structures in a forest stands. Scots pine forest stand (20.137720 E, 51.754974 N) was divided into 10 zones differing in the share of undergrowth and up−growth of deciduous species, and the presence of single oak trees growing to the upper layer. The LiDAR data obtained in the first days of May 2007 was used. 459 sample plots of a radius of R=11.28 m located in a 20×20 m grid were set up in the study area. Histograms of spatial distribution of airborne laser scanning pulses were made for them. The histograms are described using eight variables: (1) height above ground level of the highest point of reflection of the laser pulse, (2) height above the upper maximum of the histogram, (3) height above ground level of the lower maximum of the histogram, (4) share of pulses reflected in the upper maximum of the histogram in the total number of pulses, (5) share of pulses in the area of the lower maximum of the histogram in the total number of pulses, (6) share of pulses of the first histogram layer in the total number of pulses, (7) share of pulses in the lower layers of the histogram (from layer no. 2 to no. 11, i.e. from 0.5 to 5.5 m) in the total number of pulses in layers 1−11, i.e. from 0 to 5.5 m, as well as (8) average height above ground of the reflection places of all pulses. The measure of the similarity of the extracted structures was the Euclidean distance of the points representing the histograms in the multidimensional feature space. The results of the division (segmentation) of forest space using the Ward’s method into 2 to 9 groups were analysed. It was found that the obtained divisions are related to the tree stand zones distinguished during the inventory carried out in the field. The proposed taxonomic method of LiDAR data analysis allows for the identification of homogeneous spatial structures in forest stands.
Źródło:
Sylwan; 2020, 164, 10; 805-819
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sezonowa zmienność rozkładu chmury punktów skanowania laserowego w drzewostanach iglastych i jej związek z cechami taksacyjnymi drzewostanu
Seasonal variability of distribution of laser scanning point cloud in coniferous stands and its relationship with stand valuation characteristics
Autorzy:
Będkowski, K.
Brach, M.
Banaszczak, P.
Powiązania:
https://bibliotekanauki.pl/articles/973707.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lasy
skanowanie laserowe
lidar
drzewostany iglaste
cechy taksacyjne
pomiary terenowe
zwarcie drzewostanu
leśnictwo
rozkład punktów odbić impulsów laserowych
zmienność sezonowa
wysokość drzew
wysokość miejsca zwarcia
wysokość osadzenia korony
pierśnice drzew
point cloud
accuracy
forestry
LIDAR
DTM
Opis:
Increasing knowledge of the spatial structure of forests can contribute to the improvement of stand stability and silviculture rules. New opportunities in this respect are offered by the laser scanning technique, which allows to determine different stand characteristics and anticipate their spatial structure. It was found that certain features of laser pulse distribution histograms do not change significantly during the growing season and show a strong correlation with the characteristics of the stands located in the Rogów Arboretum, Warsaw University of Life Sciences – SGGW.
Źródło:
Sylwan; 2011, 155, 11; 736-748
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie dokładności zdalnych metod szacowania wysokości drzew
Comparison of the accuracy of remote methods of tree−height estimation
Autorzy:
Mielcarek, M.
Bałazy, R.
Zawieja-Niedźwiecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/989919.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
wysokosc drzew
szacowanie
lotniczy skaning laserowy
stereofotogrametria
lidar
dokladnosc
airborne laser scanning
stereo−photogrammetry
tree height
forestry
Opis:
The presented study deals with new capabilities of tree height estimation based on the remote sensing techniques. The main goal of this study is to find out the accuracy of tree height estimation based on LiDAR data and stereo−photogrammetric measurements. The area of investigation is located in the Western Sudetes Mountains (southern Poland). There were 75 trees chosen (Picea sp.) and measured using three different methods: traditional field measurements, stereo – photogrammetric observations and Airborne Laser Scanning (ALS). Tree heights estimated using LiDAR data and stereo−photogrammetric measurements were compared to heights acquired in the field. The mean tree height difference between LiDAR and field measurements was 0.60 m (RMSE=1.47 m), whereas the mean tree height difference between stereo−photogrammetric measurements and field equaled to –0.55 m (RMSE=1.04 m). The obtained results allow the conclusion to be drawn that Airborne Laser Scanning and stereo−photogrammetric observations are competitive with traditional methods of forest parameters measurements owing to the automation and accuracy of surveys. This study has confirmed that remote sensing techniques are effective and reliable methods of obtaining data for forest inventory.
Źródło:
Sylwan; 2015, 159, 09; 714-721
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zależność między pierśnicą a cechami koron uzyskanymi z lotniczego skanowania laserowego
Relationship between dbh and crown characteristics derived by airborne laser scanner
Autorzy:
Zasada, M.
Stereńczak, K.
Brach, M.
Powiązania:
https://bibliotekanauki.pl/articles/973712.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lasy
skanowanie laserowe
lidar
korony drzew
pomiary
powierzchnia rzutu korony
piersnicowe pole przekroju
leśnictwo
drzewa leśne
pierśnice drzew
pierśnicowe pole przekroju
airborne laser scanning
dbh
crown parameters
Opis:
The main goal of the study was the determination of the relationship between selected crown parameters derived from automatically processed airborne laser scanning (ALS) data and tree diameter. It has been found that the best set of features for that purpose is crown projection area (CPA) as a predictor and tree basal area (BA) as dependent variable. Two algorithms of crown segmentation (‘growing’ and ‘pouring’) have been analysed. Weibull, exponential and hyperbole functions have been the best for description of the relationship between CPA and BA. The relationship between tree diameter and crown characteristics was significant, but relatively weak. This can be attributed to the fact, that the relationship can be modified by various stand characteristics. Including such variables as tree stocking and crown closure should improve the model significantly.
Źródło:
Sylwan; 2011, 155, 11; 725-735
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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