[Proj] Misplaced SHP obtained with PROJ 4.8.0 called from gvSIG CE

Andre Joost andre+joost at nurfuerspam.de
Mon Aug 26 09:33:34 EST 2013

Am 26.08.2013 14:54, schrieb Jorge Arevalo:

> Actually, my SRSs are:
> source SRS: +proj=tmerc +lat_0=0.0 +lon_0=-3.0 +k=0.9996 +x_0=500000.0
> +y_0=0.0 +ellps=intl +units=m +nadgrids=sped2et.gsb
> target SRS: +proj=tmerc +lat_0=0.0 +lon_0=-3.0 +k=0.9996 +x_0=500000.0
> +y_0=0.0 +ellps=GRS80 +units=m

The second one is missing +nadgrids or +towgs84. Without it, proj does 
not make a datum shift, but assumes both CRS to have the same datum.

Ij QGIS, the two EPSG read therefore:

> +proj=utm +zone=30 +ellps=intl +towgs84=-87,-98,-121,0,0,0,0 +units=m +no_defs
> +proj=utm +zone=30 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs

André Joost

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