[GRASS-dev] PROJ6 support in GRASS

[Markus Neteler]

On Wed, Sep 4, 2019 at 4:31 AM Anna Petrášová <kratochanna at gmail.com> wrote:
> On Tue, Sep 3, 2019 at 4:22 AM Markus Metz <markus.metz.giswork at gmail.com> wrote:
>>
>> Hi all,
>>
>> there is a new PR for PROJ6 support in GRASS
>> https://github.com/OSGeo/grass/pull/118
>>
>> There are two important changes when using PROJ6:
>>
>> First, reprojection with v.proj and r.proj is no longer always possible without the user making informed decisions. The reason is that there can be several different operations available to reproject coordinates from one CRS to another CRS. These different operations are listed and the user has to provide the appropriate operation with the pipeline option, taking care of any axisswap.
>
> first, thanks for all the work. Second, I don't see how most users are supposed to know what to pick. Is there perhaps a way to pick a good default? I just can't imagine not having r.import/v.import...

I see the same problem: users won't know what to select if defaults
are gone with PROJ 6.

> Anna
>>
>>
>> Second, axis order is no longer always easting, northing, e.g. for EPSG:4326 it is northing, easting, and an axisswap might need to be removed from operations provided by PROJ.
>>
>> There are many more changes (see details in the PR), but these are the two most important ones.
>>
>> Feedback welcome!

Thanks for your hard work.

I talked to Robert Bivand here at the GeoSTAT 2019 in Münster who gave
a talk about the topic:

"Not just R-spatial: sustaining open source geospatial software stacks"
https://github.com/rsbivand/geostat19_talk

You can quick-view the talk in rendered HTML like this (maybe there
are better ways):
http://htmlpreview.github.io/?https://raw.githubusercontent.com/rsbivand/geostat19_talk/master/docs/geostat_bivand_19.html

It contains a section about PROJ (6).

markusN