Stefan, A fair question; since I know the stream topology from personal experience it is clear that there should be no break in the stream network and the flow accumulation grid should reflect that. I am seeing the flow accumulation values break at a point where they should continue to accumulate downstream.
Tom On Fri, Feb 13, 2015 at 11:43 AM, Stefan Lüdtke <[email protected]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi Tom, > > just out of curiosity, what do you mean by "break in the flow > accumulation"? > > Cheers, > > Stefan > > On 02/13/2015 07:12 PM, Thomas Adams wrote: > > Hello all! > > > > I'm making use of the flow accumulation grid in GRASS 6.4.5 > > generated from r.watershed using the SFD (D8) flow algorithm. The > > DEM has a 250m spatial resolution. What I'm getting is a break in > > the flow accumulation in a few locations which is causing me > > serious problems with subsequent processing (with help from some > > here, I have put together some scripting to generate a pixel > > connectivity file for a distributed hydrologic model). > > > > Besides going to a higher resolution DEM, are there any thoughts as > > to how I can eliminate these flow accumulation breaks? > > > > Thank you, Tom > > > > -- > > > > > > > > _______________________________________________ grass-user mailing > > list [email protected] > > http://lists.osgeo.org/mailman/listinfo/grass-user > > > > - -- > Stefan Lüdtke > > Section 5.4- Hydrology > Tel.: +49 331 288 2821 > Fax: +49 331 288 1570 > Email: [email protected] > > Helmholtz-Zentrum Potsdam > Deutsches GeoForschungsZentrum GFZ > (GFZ German Research Centre for Geoscience) > Stiftung des öff. Rechts Land Brandenburg > Telegrafenberg, 14473 Potsdam > - ------------------- > > PGP Public Key: http://bit.ly/13d9Sca > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.11 (GNU/Linux) > > iQEcBAEBAgAGBQJU3kXYAAoJEB5GAbKcg+D8YqMH/jgJZ70cz69IJal6ICi66wqW > lQYnnko592KAOlFDu1lReZhWWVgeA59rDsYA2Gg/rBzoL9Nst3hzIJDWqnhIWl3W > YgF/vOJgTRnrNJtOibGpOc8hxrHwElxU7afYlXU8Zk+4tXdZRK4/vrQ4tKEcbY0z > MrhAYjR66RRpoNf9/3WJ3s14CpPA+KEkOaysOOoTV6Ni7qZTK8rVxt+svQQoPtW+ > 5QwRJLkLeM6bUrqfQifHis91j4k3JSoSp7ZjIInKwi1tvCSfcFQhzvANs4x8e1Lo > Q5wDbzHshhJieGKyraUZyT8cn9vszv9cm2Sf49O/0FWVz3Eyc9vsKFxVcvfEb1E= > =Sy/3 > -----END PGP SIGNATURE----- > --
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