Title :
Study on the vegetation coverage dynamic change of songhuajiang watershed based on RS and GIS
Author :
Gong, Wenfeng ; Liu, Tiedong
Author_Institution :
Coll. of Hydraulic & Electr. Eng., Heilongjiang Univ., Harbin, China
Abstract :
The vegetation coverage was generated by processing the Landsat TM/ ETM+ images of 1989, 1995 and 2001 using remote sensing and geographical information systems technology and estimating NDVI of Songhuajiang river. To analyze the changes of vegetation coverage over time, the vegetation coverage was overlaid at the watershed scale with the support of spatial analysis of ArcGIS 9.2. The results showed that the NDVI value was 0.1-0.2 in 1989-1995a and 0.4-0.5 in 1995-2001a when the increment of pixel number and area was greatest meanwhile the NDVI value was -1 in 1989-1995a and 0.1-0.2 in 1995-2001a when the reduction was greatest. The NDVI value was increased in the region focused on the general vegetation coverage from 1989-2001a and decreased mainly in the region with high vegetation coverage in 1989-1995, but the greatest reduction of value was in the region with low vegetation in 1995-2001a.
Keywords :
geographic information systems; geophysical image processing; remote sensing; rivers; vegetation mapping; water resources; ArcGIS 9.2; China; Landsat ETM+ images; NDVI value; Songhuajiang River; geographical information system technology; high vegetation coverage; pixel number; remote sensing; vegetation coverage dynamic change; watershed scale; Land surface; Pixel; Remote sensing; Rivers; Soil; Vegetation; Vegetation mapping; GIS; Songhuajiang watershed; dynamic monitoring; vegetation cover;
Conference_Titel :
Remote Sensing, Environment and Transportation Engineering (RSETE), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-9172-8
DOI :
10.1109/RSETE.2011.5965109
