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Wyszukujesz frazę "digital forest map" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Dokładność szybkich metod inwentaryzacji leśnej mapy numerycznej
Accuracy of fast inventory techniques used for digital forests map update
Autorzy:
Brach, M.
Stanczak, L.
Szymanski, P.
Powiązania:
https://bibliotekanauki.pl/articles/987124.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lesne mapy numeryczne
aktualizacja
urzadzenia nawigacyjne
bezzalogowe statki powietrzne
pomiary naziemne
pomiary geodezyjne
ortofotomapy
dokladnosc pomiaru
rpas
uav
orthophotomap
forest
gnss
measurements
digital forest map update
Opis:
The functioning of the forest digital maps and conducting complex silviculture implemented in accordance with the diversified development creates great demand for a quick method of spatial data capture. Currently used data collectors and navigation receivers enable the measurements of the forest, but the results are not reliable taking into account their quality. In this study the evaluation of currently used measuring devices were realized and new, reliable solution that can streamline data capture in the field was proposed. The work was carried out in the Pułtusk Forest District (central Poland). We established five plots in the stand with the alder as a dominant species. 137 reference points were captured using classical surveying methods. We used the following data collectors: Motorola Omnii XT15 and Workabout PRO, Samsung Galaxy Core Plus smartphone and GIS Trimble ProXH navigation receiver. In addition, the unmanned aircraft i.e. popular on the market DJI Phantom 4 was also used. The accuracy was assessed by determining the error of the plot area and the accuracy of control points (MP). It was found that current popular data collectors and smartphones define the plot area with an error of about 3%, the same positioning of the object can be accurate from 2 to 6 meters (tab. 1). The results allow to conclude that the use of smartphones may be important only for draft assessment, and the realization of the measurement using the data collectors should always be preceded by the control measurement on the charac− teristic points. Significantly better results are obtained by the GIS class receivers (MP less than 2 meters) and using differential correction (MP less than 0.6 meters). However, these devices are used rarely in practice, despite universal access to the network of GNSS reference stations. The use of drone allowed to obtain images for the entire area in 15 minutes. The orthophotomap was automatically made in point−cloud technology. This method gave an error of 1.3% for estimat− ing the plot area and 1.69 meters for the position of control points for objects borders. Given the falling prices of unmanned platforms and low labor intensity of this measurement method, we can assume that it will find widespread use in updating of forest digital maps.
Źródło:
Sylwan; 2017, 161, 01; 18-26
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowa koncepcja określania działki ewidencyjnej dla gruntów w zarządzie PGL Lasy Państwowe
New concept of registered parcel determination for areas in the property of the State Forests National Forest Holding
Autorzy:
Brach, M.
Karaszkiewicz, W.
Olenderek, H.
Ostrowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/989941.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Panstwowe Gospodarstwo Lesne Lasy Panstwowe
grunty lesne
ewidencja gruntow
dzialki ewidencyjne
dzialki lesne
compartment
forest complex
forest digital map accuracy
land registry
Opis:
The registered parcel can be explained as continuous part of land within a subdistrict. It has to be also homogeneous legally and separated from other objects by the boundary lines. In the spatial structure of the State Forests National Forest Holding the registered parcel correspond to a forest compartment. The paper presents new approach to registered parcel definition, which can store more than one forest compartment (forest complex). In this way it is possible to create new basic area object as a base for cadastre (land registry) within the forest district. The aim of this study was to assess positioning accuracy of the boundary marker and the area of registered parcel. The measurements were conducted on stabilized boundary markers within forest complex and not−stabilized boundary markers within forest compartments. Using surveying technology the network of polygonal traverses were created. The control points for every travers line were measured by geodetic class GNSS receiver. It was assumed that all measured coordinates are free from error, so it was possible to asses registered parcel positioning errors. These errors are ±3.96 m for not−stabilized boundary markers and ±0.43 m for stabilized boundary markers. Applying the new idea, all existing forest compartments were joint into one big parcel within forest complex. The total number of parcels was reduced from 988 to 335. Based on formula [4] the area of parcels was calculated in two variants: considering their existing borders (not−stabilized boundary markers) and considering merged parcels (stabilized boundary markers). For the previous, the average error of parcel area equals to 1348 m² (26−6606, standard deviation=814 m²). In the latter variant, the average error of parcel area is much lower and equals 147 m² (5−3008, standard deviation=293 m²). The final results prove that new concept for basic area objects is justified and should be gradually implemented in the State Forests. This idea will not only facilitate forest management, but increase accuracy of borders positioning and simplify land registry as well.
Źródło:
Sylwan; 2015, 159, 11; 883-892
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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