In this paper, the images from Landsat-5 were used; the spatial resolution was 30 meters
(http://glovis.usgs.gov/). The map of rice distribution was extracted from the images by combining
supervised and unsupervised methods. Then with the help of ArcGis 10, the average NDVI of rice in
each month from July to September during the 12 years can be captured and used to analyze the
relationship with the Z index