Palakuru, M; Yarrakula, K (2020). A comparison study of space borne Dual Polarization Difference Index (Sea Wind SCATSAT-1 Scatterometer) and NDVI (MODIS) on paddy crop growth. INDIAN JOURNAL OF GEO-MARINE SCIENCES, 49(9), 1580-1586.

Paddy rice occupied higher position among the staple food crops in the world. Paddy being a wetland crop; it requires more water than the other crops. India is one of the largest paddy producers in the world. Andhra Pradesh is the second largest paddy producer in India after West Bengal. In the latest era of technology, microwave remote sensing play major role in large scale monitoring of crop growth irrespective of environmental condition. In the present study dual polarized pencil beam SCATSAT-1 (Scatterometer Satellite 1) scatterometer and MODIS (Moderate Resolution Imaging Spectroradiometer) NDVI (Normalized Difference Vegetation Index) datasets are used to study paddy crop growth. Horizontal and vertical polarisation brightness temperatures were used to derive Dual Polarization Difference Index (DPDI) for paddy and forest classes. The DPDI was related with 16-day composite of NDVI data of MODIS sensor. To test the hypothesis, z-test was performed for testing significance between DPDI and NDVI. In the z-test the calculated value 11.455 is greater than table value 2.576, hence alternate hypothesis is accepted. Therefore, it is statistically proved that DPDI-NDVI relationship is influenced by soil moisture.