Geo-spatial Variability of Physiographic Parameters and Landslide Potentiality - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 61

Fig. 2.2 Contour orientation of the Shivkhola watershed
2.2.2 Digital Elevation Model (DEM)
The prepared contour map at 20 m interval from the topographical map of 1987 at
the scale of 1:50000 was used for generating the Digital Elevation Model (DEM) by
using ARC GIS Software which helped to have an appreciation of the nature of
relief and the distribution of slope over the basin area (Fig. 2.3 ). The relief is mainly
guided by the position of the drainage lines and amount of dissection. The graded
state, characterized by gentle slope (graded slope) which is established at the
confluence at the flag end gradually creeps upward to the upper catchment
following the channels. The valley-side slopes are steeper enough showing absolute