Retrieving Soil Moisture by TVDI Based on Different Vegetation Index: A Case Study of Shanxi Province
Combined with ground weather observation data from March 2005 to October, the MODIS vegetation index products was used to analysis the sensitivity of Ratio Vegetation Index (RVI), Normalized Difference Vegetation Index (NDVI) and the Enhanced Vegetation Index (EVI) under different coverage of surface. Together with the MODIS land surface temperature products to form the feature space of Ts/RVI, Ts/NDVI and Ts/EVI, from which obtaining the TemperatureVegetation Dryness Index (TVDI). Based on TVDI, the 0-20 cm relative soil moisture is acquired. Results show that the average soil moisture retrieved from Ts/EVI is closer to in situ data. Average retrieved soil moisture relative to average verification soil moisture has a deviation of 2％-l2％. However, the Ts/RVI has a better accuracy of retrieving soil moisture under vegetation coverage of higher than 0.6, while Ts/EVI performs better for inversing soil moisture under low vegetation coverage of lower than 0.4.
soil moisture vegetation index TVDI
Runping Shen Peng Yu Jing Yan Yunfeng Wang
Key Laboratory of Meteorological Disaster of Ministry of Education of Nanjing University of Informat Shaanxi Meteorological Bureau Remote Sensing Institute of NUIST Xian. P.R. China Key Laboratory of Meteorological Disaster of Ministry of Education of Nanjing University of Informat Shanxi Meteorological Bureau Remote Sensing Institute of NUIST Taiyuan. P.R. China
国际会议
杭州
英文
418-422
2012-03-23（万方平台首次上网日期，不代表论文的发表时间）