[GRASS-user] v.import and v.proj errors

[Veronica Andreo]

Thanks Helli and Moritz for help :)

[...]


> I can confirm the issue when using v.in.ogr + v.proj, when using the file
> to define the location:
>
> grass73 -c /data/GEODATA/OSM/coastlines-generalized-3857/coastlines_z8.shp
> /data/GRASS/DATA7/test_3857/
> v.in.ogr /data/GEODATA/OSM/coastlines-generalized-3857/coastlines_z8.shp
>
> and then in the EPSG 3035 location:
>
> v.proj location=test_3857 mapset=PERMANENT input=coastlines_z8
> Reprojecting primitives ...
> ATTENTION: pj_transform() a échoué: failed to load datum shift file
> ERREUR :Unable to re-project vector map <coastlines_z8 at PERMANENT> from
>         <test_3857>
>
>
> However, when I create the 3857 location using the EPSG code, it works:
>
> grass73 -c epsg:3857 /data/GRASS/DATA7/test_3857_epsg/
> [...]
> v.proj location=test_3857_epsg mapset=PERMANENT input=coastlines_z8
>
> success.
>

yeah, I just tested here with the same result... so, creating the 3857
location with the coastlines .shp file then produces the error when
reprojecting to 3035 because of this extra "nadgrids: @null" in the .prj...
good to know :)

There is a difference in the projection definition between the two:
>
> diff -u test_3857/PERMANENT/PROJ_INFO test_3857_epsg/PERMANENT/PROJ_INFO
> --- test_3857/PERMANENT/PROJ_INFO       2016-08-02 18:24:25.965809631 +0200
> +++ test_3857_epsg/PERMANENT/PROJ_INFO  2016-08-02 18:28:18.427085934 +0200
> @@ -7,7 +7,5 @@
>  x_0: 0.0
>  y_0: 0
>  k: 1.0
> -nadgrids: @null
>  wktext: defined
>  no_defs: defined
> -over: defined
>
> Erasing the 'nadgrids: @null' from the first allows to reproject.
>
> The .prj file of the original shapefile contains:
>
> EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0
> +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over"]
>
> I guess the issue comes from how this is handled...
>

It seems so... Thank you very much to both for your time!!!

Vero
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