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Wyszukujesz frazę "topographic features" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Wpływ wybranych czynników ekologicznych na kształtowanie się stabilności górskich drzewostanów świerkowych w Beskidach Zachodnich
Effect of selected ecological factors on the stability of Norway spruce stands in the Beskidy Zachodnie Mountains
Autorzy:
Socha, J.
Powiązania:
https://bibliotekanauki.pl/articles/1013526.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
smuklosc drzew
intensywnosc przyrostu miazszosci
Picea
lasy gorskie
drzewostany swierkowe
stabilnosc
przyrost miazszosci
lesnictwo
wzgledna dlugosc korony
wskaznik stabilnosci
swierk
czynniki ekologiczne
drzewa lesne
slenderness
relative crown length
volume increment
topographic features
stand density
Opis:
The research focused on the effect of environmental factors on the stability of mountain spruce forests in the Beskidy Zachodnie. Stand stability was evaluated on the basis of slenderness, relative crown length and intensity of volume increment. The performed analyses show that stands growing at higher elevations are more stable. This is related, among other things, to worse environmental conditions resulting in the lower slenderness value and higher relative crown length.
Źródło:
Sylwan; 2008, 152, 03; 40-49
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometric and semantic quality assessments of building features in OpenStreetMap for some areas of Istanbul
Autorzy:
Basaraner, Melih
Powiązania:
https://bibliotekanauki.pl/articles/1191768.pdf
Data publikacji:
2020
Wydawca:
Oddział Kartograficzny Polskiego Towarzystwa Geograficznego
Tematy:
OpenStreetMap
building features
geometric data quality
semantic data quality
topographic data
Opis:
Nowadays volunteered geographic information (VGI) and collaborative mapping projects such as OpenStreetMap (OSM) have gained popularity as they not only offer free data but also allow crowdsourced contributions. Spatial data entry in this manner creates quality concerns for further use of the VGI data. In this regard, this article focuses on the assessments of geometric and semantic quality of the OSM building features (BFs) against a large-scale topographic (TOPO) data belonging to some areas of Istanbul. The comparison is carried out based on the one-to-one matched BFs according to a geometric matching ratio. In geometric terms, various parameters of position (i.e. X, Y), size (i.e. area, perimeter and granularity), shape (i.e. convexity, circularity, elongation, equivalent rectangular index, rectangularity and roughness index), and orientation (i.e. orientation angle) elements are computed and compared. In semantic terms, BF type coherences are evaluated. According to the findings of geometric quality, the average positional difference was less than three meters. In addition, the perimeter values tended to decrease while area and granularity values tended to increase in OSM data against TOPO data. Those showed that the level of the detail of the OSM BFs was lower than TOPO BFs in general. This was also confirmed by the decreasing tendency of shape complexity according to the parameters of shape element. Orientation angle differences was often low except for some special cases. It was found that the scale of the OSM dataset, even though not homogenous, approximately corresponded to the lower limit of medium scale maps (i.e. 1:10,000) or a slightly smaller scale. According to the findings of semantic quality, in case of the presence of specific type definition, the coherence was rather high between OSM and TOPO BFs while the most OSM BFs did not have a specific type attribute. This study showed that the matching process needed some improvements while the followed approach was largely successful in the evaluation of the matched buildings from geometric and semantic aspects.
Źródło:
Polish Cartographical Review; 2020, 52, 3; 94-107
2450-6974
Pojawia się w:
Polish Cartographical Review
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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