Integration of high resolution satellite data, DEM and GIS for large scale mapping – A case study from lower Gangetic alluvial plain of India

The present paper deals with the technique of large scale mapping using satellite data of 5.8m resolution accompanied by DEM in GIS environment essential for farm level planning and development. The study area is located in the lower gangetic alluvial plain of India where elevation ranges from 5 to 14 meter above Mean Sea Level (MSL). Digital interpretation of IRS P6 LISS IV satellite image in conjunction with Survey of India topographical maps and ASTERGDEM of 30meter resolution and subsequent ground data helped to prepare PPU (Physiographic cum photomorphic unit) map which were further correlated with elevation and NDVI values. Soils occurring in different PPU were examined and PPU-soil relationship was developed. The technique of mapping thus can be extended through faster as well as precision mapping at farm level with plot wise information for site-specific management on cost-effective basis.