3D MODELLING & ESTIMATION OF SURFACE AREA AND CHANGE IN VOLUME OF LANDSLIDE USING CLOSE -RANGE PHOTOGRAMMETRY

Abstract

India accounts for 20 % of global landslides ,mostly because of the young Himalayan mountain range. Approximately 11,000 deaths have occurred in last 12 years which is really alarming figure . For monitoring landslide , Close Range Photogrammetry was used and two different sets of data ( Pre-monsoon and Post-monsoon ) were taken to analyse the change in the volume and surface area of the Kesharwala ( near Dehradun ) landslide. The detailed and comparative study of the 2 models reviewed the surface area has increased from 75701.5 meter square ( Pre-monsoon )to 78903.4 meter square . Where as there has been an evident loss in the volume of the landslide as the change on volume obtained is about 836732.89 M^3 . The average precipitation in Dehradun is about 1802.1 mm and this considerable change in the volume can slowly convert this passive landslide into an active one.