Geographical analysis

Abstract

Abstract Data selection and assessing the accuracy of the data is more important in any type of research.Here morphometric analysis of the study area were carried out from two open source satellite derived Digital Elevation Model (CartoDEM and SRTM DEM). The accuracy of both the data is assessed by comparative study of different morphometric parameters.The accuratedelineation of the catchment boundaries is the firstimportant step in the determination of catchmentgeometry and extraction of stream network formorphometric analysis. SOI toposheet are also used as a base data and to rectify the delineated results from the DEM.Archydro tool in ArcGIS 9.3 version are utilized for the delineation of stream networks from the DEM. The drainage networks are also digitized from SOI toposheet for the reference. The standard methods are followed for the delineations drainage networks and sub-watershed boundary. SOI topographic maps and CartoDEM data are more correlated to the each other.Results shows the area is suffer severe erosion and surface runoff. CartoDEM data provide satisfactory information about the catchment characteristics. Derivedparameters are used for the prioritization of the sub-watershed and resource management in the study area.

Keywords: Morphometric analysis, sub-watershed, DEM, Archydro, GIS