• R. SHIVAKUMAR
• Dr.S.SURESH BABU
• Dr.K.E PRAKASH

In present study, the digital elevation model from Advanced Spaceborne Thermal Emission and Reflection Radiometer - Global Digital Elevation Model (ASTER GDEM) of 30 m resolution is used to carry out the automatic extraction of stream network at the threshold of 0.05 km2. ASTER GDEM was processed using ArcGIS Hydrology tool by adopting Deterministic Eight-node (D8) method to derive the stream (drainage) network map of Tumakuru sub-basin in Karnataka State of India. The delineation and extraction of stream network has helped in calculating the length of streams under different stream orders as follows: 1st order has a total length of 782.96 km, 2nd order 391.31 km, 3rd order 174.55 km, 4th order 118.82 km and 5th order 40.69 km covering 51%, 25%, 12%, 9% and 3% of the study area respectively. The automatic drainage network extracted from ASTER GDEM after sinks filled with the threshold value >500 for the flow accumulation was subjected to ground truth analysis based on GPS survey. There is a good match between the random check points generated on the map and the ground truth measurements. The accuracy of the stream order map generated from ASTER GDEM is found to be 87%.

Stream network, ASTER GDEM, Stream ordering, D8 method, flow direction, flow accumulation

"MAPPING THE GROUND WATER PROSPECTIVE ZONES USING INTEGRATED APPROACH BY RS & GIS-A CASE STUDY FOR TUMAKUR TALUK", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 11, page no.139-146, November-2018, Available :http://www.jetir.org/papers/JETIR1811214.pdf

"MAPPING THE GROUND WATER PROSPECTIVE ZONES USING INTEGRATED APPROACH BY RS & GIS-A CASE STUDY FOR TUMAKUR TALUK", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 11, page no. pp139-146, November-2018, Available at : http://www.jetir.org/papers/JETIR1811214.pdf