Reclamative grouping of ravines using Cartosat1 P

Authors: Sreenivas Kandrika R S Dwivedi

Publish Date: 2013/01/06

Volume: 41, Issue: 3, Pages: 731-737

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Abstract

Information on the depth and bed width of ravines network of gullies at large scales is critical for their reclamation and management Hitherto such information has been generated from aerial photographs and space borne stereo images with medium to coarse ‘z’ – axis resolution The present study aims at demonstrating the potential of Cartosat −1 an Indian Earth observations satellite stereo images with 25 m spatial resolution in deriving morphometric information on ravines for their reclamative grouping The study area is a part of Jhansi and Hamirpur districts of Uttar Pradesh northern India The approach involves acquiring precise ground control points using Differential GPS DGPS triangulation DEM extraction and generation of ortho image as well as anaglyphs for stereo viewing The depth and bed width of ravines were measured in the field for validation A comparison with field observations reveal that the bed width of ravines and depth can be measured successfully with Carto1 stereo data The anaglyph data was used to delineate various categories of ravines based on their depth and bed width Results indicate that the Cartosat1 stereo images are quite suitable for delineation of three categories of ravines namely shallow 3 m deep and 18 m bed width medium deep 3–9 m deep and 18 m bed width and deep 9 m deep which are important for their reclamation

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