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| Subject: | GISList: Fw: Rivers from a DEM |
| Date: |
12/23/2001 09:22:52 PM |
| From: |
ðÅÔÒ ûÁÒÙÊ |
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-----Original Message-----
From: "Peter Shary" <peter_shary@hotmail.com>
To: p_shary@mail.ru
Date: Wed, 12 Dec 2001 18:59:19 +0300
Subject: Fwd: [IR-L\ Fwd: Rivers from a DEM
>
>
>
>
> >From: Peter Shary <peter_shary@HOTMAIL.COM>
> >Reply-To: IRRIGATION-L List for 'irrigation theory and practice'
> > <IRRIGATION-L@LISTSERV.DFN.DE>
> >To: IRRIGATION-L@LISTSERV.DFN.DE
> >Subject: [IR-L\ Fwd: Rivers from a DEM
> >Date: Wed, 12 Dec 2001 18:29:21 +0300
> >
> >Dear list,
> >
> >Please ignore this if you are not interesting in correct DEMs treatment in
> >hydrology.
> >
> >There was a small discussion in two discussion groups on how to extract
> >river channels from DEMs. I believe that there are SUBSTANTIATED and
> >SCHEMATIZED (simplified) approaches, most people implementing the latter
> >(as
> >in below-mentioned BASIN.AVX that, in part, calculates sub-basin perimeter,
> >and in many other programs): I am developing the former, and I have
> >implemented some of them in Analytical GIS Eco (see raster maps at URL
> >http://members.fortunecity.com/eco4/giseco/).
> >I feel (and I work on) essential advances in correct DEMs treatment for
> >hydrological purposes in nearest future.
> >
> >Hope it would be interesting to recognize, to which extent correct is our
> >DEMs use in hydrology.
> >Peter Shary
> >
> >----- original message from Rasterlist -----
> >From : Nancy & John Hultquist <nancyh@ellensburg.com>
> >To : "Nattis, Randy" <Randy.Nattis@ttemi.com>
> >CC : rasterlist@thinkspace.com
> >Subject : How about BASIN ? FWD: Extracting rivers from DEMs
> >Date : Wed, 24 Oct 2001 22:30:52 -0700
> >Attachment : BASIN1.doc (60k)
> >
> >Have you tried the BASIN script that is an Avenue Extension?
> >
> >I found a short description I'll attach, and if you cannot find
> >it through a search on the web, use google.com, BASIN, then write me
> >and I'll look for more. I have used it successfully.
> >Nancy
> >
> >Sent through: RasterList
> >------------------------
> >Dear all,
> >
> >Please ignore this if the topic is out of your interest.
> >
> >----- October 19, in GIS List: -----
> >Hi listers,
> >
> >There were several questions (Randy Nattis, Xiaobo Zhou) on how
> >to extract rivers from a DEM. The best way I know is to calculate
> >so called catchment area from a raster DEM (i.e., grid).
> >Look at catchment area map image at this URL address:
> >http://members.fortunecity.com/eco4/giseco/
> >Catchment area maps provide both real and potential (dry) rivers
> >not distinguishing them. These maps are good at large scales,
> >but may produce false depressions at small scales, that is, at grid
> >meshes greater than characteristic valley widths (usually 100-200m).
> >Catchment area is implemented in ARC/INFO for Silicon Graphics,
> >see the above-mentioned Web site for corresponding PC-software
> >that can be used with ArcView or ARC/INFO.
> >
> >Hope this will appear helpful.
> >
> >Peter Shary
> >
> >>From:"Nattis, Randy" <Randy.Nattis@ttemi.com>
> >>To:gislist@geocomm.com
> >>Date:Wed, 17 Oct 2001 08:27:13 -0700
> >>Subject:GISList: surface runoff flow
> >>
> >>Any advise on this one?
> >>
> >>I am using 30m DEM's to try and derive surface runoff of a landfill (I
> >>have
> >3d and spatial analysis, plus I'm using AV 3.2). I'm trying to prove that
> >the surface runoff is in a certain direction i.e., river. I've been
> >searching around for some scripts to assist me, but haven't found anything
> >quite right. I'm looking for something that will supply different length
> >arrows depending on the slope and direction (or something like this). I
> >would program some avenue code, but I do not have the time. Any insight on
> >this would greatly be appreciated.
> >>
> >>Thanks in advance,
> >>
> >>Randy Nattis
> >>
> >
> >
> >>From: Xiaobo Zhou <xizhou@vt.edu>
> >>To:gislist@geocomm.com
> >>Date:Thu, 18 Oct 2001 13:11:28 -0400
> >>Subject:GISList: Match DEMs to extract river network
> >>
> >>Hi all,
> >>
> >>I have to use Two (maybe more) DEMs together to extract river networks in
> >ArcView3.2. The question is how to ma
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