[GRASS-user] GeoTIFF, EPSG and GRASS

[Etienne DELAY]

Hi Adrien,
Stange no? I remember than one time my location definition doesn't work 
(because of dirty data). My solution was to difine the location 
pojection whit a .prj during th initialisation.
But It was on grass 6.3.

E

Le 21/08/2014 15:32, Adrien ANDRÉ a écrit :
> Hi!
>
> with GDAL i use EPSG:2972 to reproject any new raster i'm lead to work with.
>
> gdalinfo says:
>
> Coordinate System is:
> PROJCS["RGFG95 / UTM zone 22N",
>      GEOGCS["RGFG95",
>          DATUM["Reseau_Geodesique_Francais_Guyane_1995",
>              SPHEROID["GRS 1980",6378137,298.2572221010002,
>                  AUTHORITY["EPSG","7019"]],
>              TOWGS84[0,0,0,0,0,0,0],
>              AUTHORITY["EPSG","6624"]],
>          PRIMEM["Greenwich",0],
>          UNIT["degree",0.0174532925199433],
>          AUTHORITY["EPSG","4624"]],
>      PROJECTION["Transverse_Mercator"],
>      PARAMETER["latitude_of_origin",0],
>      PARAMETER["central_meridian",-51],
>      PARAMETER["scale_factor",0.9996],
>      PARAMETER["false_easting",500000],
>      PARAMETER["false_northing",0],
>      UNIT["metre",1,
>          AUTHORITY["EPSG","9001"]],
>      AUTHORITY["EPSG","2972"]]
>
> I've created the GRASS location from this same code, and all imports are
> successful.
>
> After exporting, the gdalinfo output is different:
>
> Coordinate System is:
> PROJCS["UTM Zone 22, Northern Hemisphere",
>      GEOGCS["grs80",
>          DATUM["unknown",
>              SPHEROID["Geodetic_Reference_System_1980", 6378137,
> 298.257222101]],
>          PRIMEM["Greenwich",0],
>          UNIT["degree",0.0174532925199433]],
>      PROJECTION["Transverse_Mercator"],
>      PARAMETER["latitude_of_origin",0],
>      PARAMETER["central_meridian",-51],
>      PARAMETER["scale_factor",0.9996],
>      PARAMETER["false_easting",500000],
>      PARAMETER["false_northing",0],
>      UNIT["metre",1,
>          AUTHORITY["EPSG","9001"]]]
>
> The PROJCS has lost its AUTHORITY parameter.
> Would someone know why this happens? Is there a way to fix this?
>
> Thanks in advance,
>
> regards,
>
> Adrien
>
>
>
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-- 
Cordialement

Etienne DELAY(IDSkype : etienne.delay.tic)
PhD student on evolution of vineyard landscape
laboratoire GEOLAB UMR 6042 CNRS
Université de Limoges, FLSH
39E rue Camille Guérin 87036 Limoges
blog : http://elcep.legtux.org