Importance of breaching and filling for hydrological features extraction using High Resolution DTM
Prasad Babu, G.
RMSI Pvt. Ltd

Automated hydrological feature extraction using DTM is gaining popularity with the available of high resolution remote sensing data. The derived hydrological features through DTM are not only accurate but also fasten processing speed of some hydrological modeling projects. Importantly Flood risk modeling, these accurate data sets are very much important to calculate the risk in urban centers. Apart from modeling there are various hydrological application, needs very accurate hydrological feature information. There are serious undiscovered problems exist in high resolution DTM. They are artifacts and depressions, which increase their number as well multiplies the problems as resolution of DTM increases. Secondly, high resolution DTM consumption lot of processing time and resources, especially to deal with artifacts and depressions. Artifacts are man made constructions across the rivers and show their dominance in urban location. The natural depressions like pot-holes, sinks-holes play a tremendous role, especially in derivation of hydrological features like river network and watershed. The presence of artifacts are also create secondary sinks which again problem. The above problems are shifting the hydrological features spatially from their geographical locations and also consume lot of resources and time to process. Therefore resultant models might give defective results. The present paper demonstrates the both cases of artifacts and depressions and their influence over derived river network and watershed. And also describes the technique of dealing with such problems, especial focus with high resolution DTM.


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