Snow and Ice–cover area information is important for a wide variety of scientific climate studies, water source and management applications. The NASA Earth Observing System (EOS) Moderate Resolution Imaging Spectroradiometer (MODIS) satellite, provides improved capabilities to observe snow-ice coverarea from space and has been successfully using a Normalized Difference Snow Index (NDSI) methodes, This technique is the same procedure for the Normalized Difference Vegetation Index (NDVI), along with threshold tests, to provide global, automated binary maps of snow cover. The NDSI is a spectral band ratio that takes advantage of the spectral differences of snow in short-wave infrared and visible. MODIS spectral bands to identify snow versus other features in a scene. This methodes has evaluated whether there is a “signal” in the NDSI that could be used to estimate the area of snow satellite images within a 500 m MODIS pixel, the percentage of snow cover was calculated for 500 m cells. Snow cover area in the head water sourse of the rivers can be useful to estimating the amount and the quantity of the water for the rivers. The south of Turkey area have the basin of the two rivers (Tigris and Euphrates). The main fresh water sorce to Syria and Iraq.