[GRASS-user] Datum not recognised

[Markus Neteler]

On Mon, Feb 8, 2010 at 4:51 PM, Anders Kagervall
<Anders.Kagervall at vfm.slu.se> wrote:
> Hi,
> I am quite new to GRASS and this is my first post to this list. To familiarize myself
> with the software I have started to import data and now and then I get this warning:
> "Datum <Rikets_koordinatsystem_1990> not recognised by GRASS and no parameters found"
> Is this something I should be concerned about and how can I get rid of it?
> My location is set up by choosing epsg number 3021 and the output from g.region -p is:
>
> projection: 99 (Transverse Mercator)
> zone:       0
> datum:      ** unknown (default: WGS84) **
> ellipsoid:  bessel
> north:      7679625
> south:      6124975
> west:       1196975
> east:       1900025
> nsres:      50
> ewres:      50
> rows:       31093
> cols:       14061
> cells:      437198673

The datum I have found here:
http://crs.bkg.bund.de/crseu/crs/eu-description.php?crs_id=dFNFX1JUOTAgLyBTRV9UTQ==

so the needed software change in GRASS might be:

svn diff lib/gis/
Index: lib/gis/datumtransform.table
===================================================================
--- lib/gis/datumtransform.table        (revision 40764)
+++ lib/gis/datumtransform.table        (working copy)
@@ -91,3 +91,4 @@
 tokyo   "towgs84=-147,506,687" "South Korea" " "
 # Campo Inchauspe, personal communication CONAE
(http://www.conae.gov.ar), Argentina:
 cai     "towgs84=-149.1,138.1,90.9,-0.142,0.344,0.301,0.388"
"Argentina" "provided by CONAE, Argentina"
+rt90   "towgs84=414.1,41.3,603.1,-0.855,2.141,-7.023,0.00" "Sweden
SE_RT90 to ETRS89" "http://www.crs-geo.eu"


but I don't manage to link it to EPSG 3021 in the location wizard.
We'll find out.

Markus