Open AccessResearch on Watershed Extraction Method Based on GIS
Author(s) -
Yanan Li,
Na Lei,
Yihui Xiong
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/300/2/022168
Subject(s) - digital elevation model , watershed , extraction (chemistry) , hydrology (agriculture) , advanced spaceborne thermal emission and reflection radiometer , elevation (ballistics) , remote sensing , drainage basin , convergence (economics) , structural basin , environmental science , computer science , geology , cartography , geomorphology , geography , mathematics , geometry , geotechnical engineering , chemistry , chromatography , machine learning , economic growth , economics
The Digital Elevation Model (DEM) mainly describes the ground elevation, which contains rich hydrological information and is one of the main data sources for current watershed analysis. This paper takes Fuxian County of Shaanxi Province as the research area, and uses the ASTER GDEM data of 30m resolution, based on the Hydrology module of ArcGIS10.3 platform, after the filling of the earth, the calculation of the flow direction, the calculation of the cumulant accumulation, the determination of the convergence threshold, the extraction of the river network, etc. The method of basin watershed extraction is studied and the characteristics of the basin are comprehensively analysed. The results show that when the convergence threshold is 11000, the extracted river network is closest to the actual river network, and the derivative relationship can be used to determine that the extracted river network reflects the threshold of the real water system