Fossil energy poses wide variety of environmental issues through imposing negative impacts on natural resources in world. At the same time it is unrenewable energy source and will run out in near future. Geothermal energy is a type of renewable one and which has excellent attributes like unhazardous nature, environmental friendly and low cost can meet some parts of current and future energy demands. Desert, in spite of people attitudes about which and all of its surficial unkindness and low biomass production, has great deal of potential diversity and if recognized and utilized properly, it can be used forward preventing desertification. Due to having suitable climate and sunshine all over the year, higher windiness and geothermal potential, most arid regions in Iran have paved the way to utilize and extend new and clean energy sources among others. In the present research, geothermal energy in Ferdows County in southern Khorasan province was evaluated using ETM + sensor data. Number of forty soil samples were taken in randomized manner in 64000 h area at September 2012 and traorted to pedology lab in natural resource department of Isfahan University of technology and were analyzed physiochemical. Then, samples were positioned on satellite images and all bands DN were specified and their correlation to laboratory results were calculated in which there was no significant relation mostly due to inappropriate sampling. Regions prone to hydrothermal alteration and lithological suitable position to supply geothermal energy were identified after exerting some primary satellite images processing’s using normal image processing algorithm including false color band composition, principle component analysis, Crosta, band ratio and least square fitting. Surface temperature based on Thermal band of ETM + was reconstructed through calculating area radiation potential based on NDVI. Then, fault density layers and lithological formations in Ferdows area were extracted using area geology map. Given that, land surface temperature layers, lithological unites, fault density, hydroxyl and iron hydroxyl were valuated based on their weight in exploration trend. To evaluate this map accuracy, volcanoes and spring in Ferdows were considered. These area were consistent into geothermal evidences in area. Given to high temperature in Ferdows spring (43 ? C), it is possible that Ferdows geothermal reservoir temperature is high based which Lindale graph can represent their role in improving arid area restoration and prevent natural resource destruction and desertification. Keywords: Geothermal, Desert potential, ETM + , Land Surface Temperature, Hydrothermal Alteration.
