Estimating Vegetation Coverage in the Source Region of Yarlung Zangbo River Based on TM Data
SUN Ming1,2, YANG Yang3, SHEN Wei-shou2, SU Xian4
1. Institute of Meteorological Disaster Mitigation of Guangxi/Remote Sensing Applying and Experiment Base of National Meteorological Satellite Center, Nanning 530022, China; 2. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China; 3. School of Geographical Science, Nanjing Normal University, Nanjing 210046, China; 4. Beihai Meteorological Bureau in Guangxi, Beihai 536000, China
Abstract：In order to find out the grassland coverage in the source region of the Yarlung Zangbo River, the authors selected the Landsat5 TM images as the data source, and adopted the derived data from TM such as NDVI, RVI, VI3, PVI, DVI, MSAVI, SAVI and TM4/TM5 as the main factors. In combination with the field survey data of vegetation samples, the authors selected the factors of the highest correlation and the measured vegetation coverage values to construct the regression model, and calculated the vegetation coverage of the images with this model. Some conclusions have been drawn: 1 compared with some other evaluation indices, TM4/TM5 which is suitable for modeling has the highest correlation with grassland coverage, the change trend of TM4/TM5 is consistent with the measured coverage and it enhances the difference of reflectance of degraded grassland on spectral characteristics; 2 in the 10 grades of vegetation coverage, the largest size is the coverage from 10% to 20% and its area reaches 4 322.15 km2, which accounts for 49.27% of the total grassland area; the next is 10% to 20% and 20% to 30%, whose areas reach 2 238.53 km2 (accounting for 25.52% ) and 1 397.87 km2 (accounting for 15.94%) respectively. The area of the coverage above 50% is 195.96 km2 and accounts for 2.23% of the total grassland; 3 the high coverage grassland with coverage greater than 50% is mainly distributed in the elevation range from 4 426 m to 4 800 m, its area reaches 186.25 km2 and accounts for 95.04% of the total high coverage grassland, and it is related to the water distribution conditions.
孙明, 杨洋, 沈渭寿, 苏羡. 基于TM数据的雅鲁藏布江源区草地植被盖度估测[J]. 国土资源遥感, 2012, 24(3): 71-77.
SUN Ming, YANG Yang, SHEN Wei-shou, SU Xian. Estimating Vegetation Coverage in the Source Region of Yarlung Zangbo River Based on TM Data. REMOTE SENSING FOR LAND & RESOURCES, 2012, 24(3): 71-77.
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