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Agriculture is the backbone of our country. Most of the Land in Tumkur taluk is occupied by agriculture. Due to lack of awareness, farmers grow different variety of crops in different localities. Ultimately they face the problems in crop production due to low yield. Crop suitability map provide solutions to all these problems. The study area Tumkur Taluk is located in southern part of Karnataka and belongs to semi-arid climatic condition. The cropping pattern includes majorly Coconut plantation, Arecanut plantation, Banana plantation, Ragi, Wheat, Maize, Jowar and other crops. Crop pattern study was carried out using the NDVI processing of Landsat 8 data. NDVI result is recoded by taking the training sets in field visit. Finally the crop pattern map is prepared using ArcGIS tools. Among current cropping patterns Coconut plantation, Ragi, Rice, Maize, Wheat were consume less water and they are currently suitable for the area. But Arecanut plantation, Rice and Banana plantation consume huge amount of water and were not at all suitable for the regional climatic condition. The major result deducing from this study is, Mines and Geology department accounted 34500 bore wells in Tumkur district. Every day minimum 10 crore litre of water is extracted from the ground water reservoirs. Our suitability crop modelling map will minimize the maintenance of ground water. Suitability crop pattern map includes high income and yield to farmers within less maintenance and less water usage with respect to the climatic conditions. (C) 2015 The Authors. Published by Elsevier B.V.