[GRASS-user] r.mapcalculator and r.mapcalc

[Vaclav Petras]

Hi Pedro,

On Mon, Feb 20, 2017 at 7:36 PM, Pedro Venâncio <pedrongvenancio at gmail.com>
wrote:

> Hi Vaclav,
>
> The problem with r.mapcalc in QGIS was this one:
>
> https://hub.qgis.org/issues/6894
>
>
I forgot about this ticket. If I interpret the comments correctly there are
still people who want r.mapcalculator despite its issues.

I also forgot about -l flag to list inputs and outputs in G7.2:

r.mapcalc "a = elevation + lakes" -l
output=a
input=elevation at PERMANENT,lakes at PERMANENT

It does not do the computation, it only lists the inputs and outputs. The
was point to make writing the wrappers easier and more robust. See details
here:

https://grass.osgeo.org/grass72/manuals/r.mapcalc.html
https://trac.osgeo.org/grass/ticket/2592
https://trac.osgeo.org/grass/changeset/67000


> It was partially solved, but not completely. So, Victor had created a new
> raster calculator using native QGIS classes:
>
> https://github.com/qgis/QGIS/pull/3779
>

Thanks for the info.


>
>
> 2017-02-21 0:11 GMT+00:00 Vaclav Petras <wenzeslaus at gmail.com>:
>
>>
>> On Mon, Feb 20, 2017 at 4:22 PM, Luiz Andrade <lcoandrade at gmail.com>
>> wrote:
>>
>>> 1 - Why wasn’t r.mapcalculator ported to grass7? It is great to use it
>>> from within QGIS.
>>
>>
>> Nobody really asked for that as far as I know. The porting should be
>> quite simple if you are interested in that. But that was not the issue. See
>> discussion here:
>>
>> http://trac.osgeo.org/grass/ticket/2409#comment:187
>> http://trac.osgeo.org/grass/ticket/2409#comment:190
>>
>> QGIS seemed to focus more on providing good native QGIS calc:
>>
>> https://lists.osgeo.org/pipermail/qgis-developer/2016-October/045569.html
>> https://lists.osgeo.org/pipermail/qgis-developer/2016-October/045596.html
>>
>> Of course, these things can be reevaluated anytime. Ideally in a ticket.
>>
>> If you learn or ask more about it somewhere else, please write it back. I
>> would like to have the whole picture.
>>
>> Vaclav
>>
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>>
>
>
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