Analysis of the Suitability from Different Remote Sensing Data on the Monitoring of Vegetation Change in Ruoergai Marsh
不同传感器数据在若尔盖湿地植被变化监测应用中的适宜性分析

Based on the NDVI data of different resources from Feb.2000 to Dec.2001,the difference and suitability of GIMMS-NDVI,VGT-NDVI and MODIS-NDVI responsing to the vegetation change in Ruoergai marsh were analyzed.The results showed that there was no significant difference among the three NDVI data,and the difference was mainly caused by the spectral characteristics of the sensors.The prominent sensitivity of red spectrum,removing water vapor absorption band in infrared spectrum and higher spatial resolution of the MODIS-NDVI and VGT-NDVI data,which resulted the two types data are more sensitive to the vegetation change and more suitable to the study of vegetation change than the GIMMS-NDVI in Ruoergai marsh.However,the GIMMS-NDVI has longer time series than the other two data,and will still play an important role on the study of vegetation change.