[GRASS-user] grass-user Digest, Vol 180, Issue 4
Timothy Glyn Southern
tim.southern at talktalk.net
Sat Apr 10 10:30:53 PDT 2021
The problem I have just posted appears to be the same as ticket 1123 and 1261 yet they were supposedly resolved in January. The issue appears to be that the promised wxPython 4.0.8 is still not used in the build but the problematic 4.0.7.
Is there any news on when either wxPython 4.0.8 will be available?
Thanks
Tim Southern
Dr Timothy Glyn Southern
0155 941 8432
0791 076 6814
> On 10 Apr 2021, at 17:43, Timothy Glyn Southern <tim.southern at talktalk.net> 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?
>
> 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 <mailto: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
>>>>>
>>>>> _______________________________________________
>>>>> grass-user mailing list
>>>>> grass-user at lists.osgeo.org <mailto:grass-user at lists.osgeo.org>
>>>>> https://lists.osgeo.org/mailman/listinfo/grass-user
>>>> <https://lists.osgeo.org/mailman/listinfo/grass-user>
>>>>
>>>> --
>>>> 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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