APPLICATION OF SATELLITE DATA AND GEOGRAPHIC INFORMATION SYSTEM FOR DROUGHT RISK AREA ANALYSIS IN BANDANLANHOI DISTRICT, SUKHOTHAI PROVINCE

摘要

The objectives of this study are application of satellite data and geographic information system for drought risk area analysis in Bandanlanhoi district, Sukhothai province. The study area covered 100 Sq.km and some part of villages number 1, 2, 3, 4, 5, 6 and 7 which belonged to Bandan subdistrict, villages number 1, 2, 3, 4 and 8 which belonged to Lanhoi subdistrict, village number 1 which belonged to Wungtako subdistrict, villages number 2 and 4 which belonged to Wungluek subdistrict and villages number 1 and 2 which belonged to Nongyapong subdistrict. Satellite data was applied for creation spatial data and other data such as land use and distance from water body were used for determination the drought risk area. Geographic Information System was applied to simulation spatial data such as rainfall, rainy days, relative humidity, temperature, groundwater potential, distance from water body, slope, elevation and soil drainage data. The procedure of stepwise regression model, All physical spatial data cause of drought risk area had been analysed by the stepwise regression model and showed that the well soil drainage and rainfall are important parameters. Especially, The well soil drainage is the most important parameter for determination drought risk area. Drought model was calculated from all spatial parameters by running stepwise multiple regression. The result of map accuracy was showed 58% correction.