The Z index is a very useful indicator for reflecting a certain period of drought and flood and is
popular for estimating the influence of drought and flood [2], [3]. The TRMM precipitation data have
vary in their imaging accuracy and spatial-temporal resolutions. A great deal of work has been done to
evaluate the availability of TRMM data in drought and flood monitoring [4], [5]. However, the studies
on the relationship between the Z index and changes in rice NDVI are rare.