Bulletin des sciences géographiques de l'INCT
Volume 13, Numéro 1, Pages 51-56
2009-09-30
High Resolution Dtm Process To Generate Accurate River Network For Efficient Water Resource Management
Authors : Prasad Babu G . Srinivas B . Farhat Rafique . Rajesh Edida .
Abstract
Automated hydrological feature extraction using DTM is gaining popularity with the availability of high resolution remote sensing data. The derived hydrological features from DTM are not only accurate but also accelerate the processing speed of modeling of projects like water resource management and flood risk modeling. Including modeling there are various hydrological application that needs very accurate hydrological feature information. There are serious problems that exist in the high resolution DTM. They are artifacts and depressions. which increase in number and exacerbate already existing problems with increasing DTM resolution. Secondly, high resolution DTM consumes lot of processing time and resoures, especially white dealing with artifacts and depressions. Artifacts are man made construclions across the rivers and show their dominance in urban location. The natural depressions like pot-holes, sinks-holes play a major role, especially in the derivation of hydrological features like river network and watershed. The presences of artifacts are also create secondary sinks which again lead to further complications. The above mentioned problems are shift the hydrological features spatially from their actual geographical locations and it also consume lot of resources and t i me to process. Consequently, the output models give inaccurate resul ts. This paper demonstrates occurrence of artifacts and depressions and their influence over derived river network. It also describes the techniques attempting to address/resolve such problems, wi th special. focus on high resolution DTMs.
Keywords
High Resolution DTM Process to generate accurate River Network for Efficient Water Resource Management
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