[GRASS-user] grass-user Digest, Vol 180, Issue 4
Anna Petrášová
kratochanna at gmail.com
Sat Apr 10 20:55:49 PDT 2021
Hello,
On Sat, Apr 10, 2021 at 12:51 PM Timothy Glyn Southern via grass-user <
grass-user at lists.osgeo.org> wrote:
> Problem with wxpython guy in Manjaro with grass 7.8.5
>
> Dear colleagues,
>
> Following a period of low use due to health issues I am once again trying
> to use GRASS to visualise and analyse archaeological data.
>
> I am running Manjaro and the latest download of GRASS from AUR.
>
> It starts fine and shows both display windows for the GUI and then the
> windows crash. It is repeatable.
>
> I have tried removing GRASS and reinstalling but that has not fixed the
> issue. As well I have tried changing the flags on the GUI. None make any
> difference, as soon as the mouse is apparently moved the windows crash.
>
> Is this a known problem and is there a work around?
>
based on your description it sounds like a bug in wxPython with Python 3.9:
https://github.com/OSGeo/grass/issues/1123
Hope that helps,
Anna
> Thanks
>
> Tim Southern
> Dr Timothy Glyn Southern
> 0155 941 8432
> 0791 076 6814
>
>
>
>
>
> On 4 Apr 2021, at 20:00, grass-user-request at lists.osgeo.org wrote:
>
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> Today's Topics:
>
> 1. Re: r.watershed identify inland watershed (ming han)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 3 Apr 2021 16:23:26 -0400
> From: ming han <dustming at gmail.com>
> To: Micha Silver <tsvibar at gmail.com>
> Cc: GRASS user list <grass-user at lists.osgeo.org>
> Subject: Re: [GRASS-user] r.watershed identify inland watershed
> Message-ID:
> <CAD+uAWjx1XBcc6jk+hau8MnDa7CEAJfWeeEyEWq379efWrpMkw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Micha
>
> I understand what you mean. But it requires another step to
> manually identify depressions from these pre-conditioned DEM.
>
> Cheers
> Ming
>
>
> Micha Silver <tsvibar at gmail.com> ?2021?4?3??? ??12:43???
>
>
> On 4/2/21 5:37 PM, ming han wrote:
>
> Maybe I am the only one who has this demand. Following is just a
> recommendation to GRASS r.watershed function.
> Maybe it is worth having an option to avoid r.watershed overcome
> depressions.
> The reasons are 1) there are many hydrologically pre condition DEM
> data available globally, such as:HydroSHEDS, MERIT
> 2) the depression in these DEM are real
> depressions, overcome these depressions will make the entire drainage
> system
>
>
>
> Regarding Hydrosheds, the documentation[1] in section 3.4 explains how
> they overcame the problem of sinks. They performed a regular "fill
> sinks" operation on areas that were SRTM artifacts. True natural
> depressions were identified manually, then another manual procedure of
> carving rivers was done to force flow thru these depressions and produce
> hydrologically correct streams and basins. So pre-conditioning to
> overcome depressions is not a magic bullet...
>
>
> In my opinion, the best results are obtained when true depressions
> (pits, salt playas or karst regions) are identified, and set to NULL in
> the elevation raster. That will allow r.watershed to stop routing at
> those locations, and produce correct stream and basin layers.
>
>
> [1]https://hydrosheds.org/images/inpages/HydroSHEDS_TechDoc_v1_2.pdf
>
>
> incorrectly.
>
> I understand GRASS has other functions to solve this problem, but just
> a user recommendation. I use GRASS a lot.
>
> Thanks
> Ming
>
> ming han <dustming at gmail.com <mailto:dustming at gmail.com>>
> ?2021?3?30??? ??8:06???
>
> Got it, thanks everyone~
> Ming
>
> Micha Silver <tsvibar at gmail.com <mailto:tsvibar at gmail.com>>
> ?2021?3?29??? ??2:40???
>
> Hello:
>
> You might try `r.param.scale`, or even better `r.geomorphons`
> modules to
> identify geomorphology features, then filter out all pixels
> identified
> as pits.
>
>
> r.watershed is purposely designed to overcome depressions, and
> find flow
> routing thru these spots. So I don't think you can use that
> module to
> identify depressions.
>
>
> On 3/27/21 8:49 PM, ming han wrote:
>
> Hi Everyone
>
> When I do watershed delineation using r.watershed for
>
> great salt
>
> lake watershed. I found r.watershed always tried to assign
>
> an outlet
>
> for a great salt lake, which does actually not exist because
>
> it is an
>
> inland lake and the great salt lake has no watershed outlet
>
> at all.
>
>
> I noticed that there is a depression option. But is
>
> there any
>
> way that r.watershed can automatically identify depressions
>
> while
>
> defining flow accumulation and stream network?
>
> Thanks
> Ming
>
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> --
> Micha Silver
> Ben Gurion Univ.
> Sde Boker, Remote Sensing Lab
> cell: +972-523-665918
>
> --
> Micha Silver
> Ben Gurion Univ.
> Sde Boker, Remote Sensing Lab
> cell: +972-523-665918
>
>
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