The Application of Normalized Multi-Band Drought Index (NMDI) Method in Cropland Drought Monitoring

摘要

The method of Normalized Multi-Band Drought Index (NMDI) is constructed by fully considered the channel 2 (860nm) sensitive to leaf water content changes and the difference between two liquid water absorption bands (1640 nm and 2130 nm) as the soil and vegetation water sensitive band. The potential have been confirmed with the application in different time-series MODIS data. The results show: there is a significant correlation between Normalized Multi-Band Drought Index (NMDI) and soil moisture, the index adopted passed the significant F-tests with a = 0. 01. So the method of Normalized Multi-Band Drought Index (NMDI) could be used in Henan drought monitoring. We found that the index of NMDI application to areas with moderate vegetation coverage, however, needs further investigation.