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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: Re: Depressionless DEM |
| Date: |
08/14/2001 08:38:04 AM |
| From: |
ðÅÔÒ ûÁÒÙÊ |
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>Hi List,
>I have raw DEMs of 100 meters resolution which is having imperfections like sinks and peak. The task is to create a depressionless DEM, i.e free of sinks and peaks for Hydrologic modelling. Although there is a process in ArcInfo to fill up the sinks but I would like to know more about removing peaks. As I am in doubt that the same Z_limit, (sink depth) which has been used for filling up the sink is to be used to cut the peaks or is there any other method?
>Thanks
>Dhiraj Shrivastava
Hello Dhiraj,
I think, you are right: there is no sense to cut peaks by the same method as sinks (I suppose ArcInfo uses method by Martz & de Jong, 1988) for hydrological modelling, because peak volumes are normally about 1000 times (and more: peaks may be mountains) larger than that of sinks. I stay peaks unchanged in my GIS for similar purposes, but you may try to smooth your DEM by a local filter (and after that to fill sinks), with no peaks cutting.
Martz, L.W., de Jong, E., 1988. CATCH: a Fortran program for measuring catchment area from digital elevation models. Computers & Geosciences 14(5): 627-640.
Peter Shary
http://members.fortunecity.com/eco4/giseco/
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