[Gvsig_english] raster projection

[Benjamin Ducke]

Thea,

There is no official standard for saving CRS info in a GIS dataset.
So the fact that ArcGIS has saved this information in your DEM file
does not mean that gvSIG will be able to understand it correctly.

Unfortunately, there is also a bug in the raster reprojection function
of gvSIG which leads to a crash unless both the source and target
CRS are from the EPSG database, and therefore have a valid EPSG code.

What I recommend you do is:
Set up your project View using the EPSG code that matches the CRS
you want to use, then load the raster. If gvSIG tells you about
an unknown "projection", just click "Ignore". If you have set up
the correct CRS, then your data should end up in the correct place.

Ben

----- Original Message -----
> Hi,
> I have a DEM in the following projection:
> Projected coordinate system name: Bessel_1841_Transverse_Mercator ,
> Geographic coordinate system name: GCS_Bessel_1841 (that's what ArcGIS
> says).
> 
> When I load this file into a new view with the projection ESRI 4004
> GCS_Bessel_1841 I get a warning message, that the projection of the
> file differs from the one of the view.
> When I click ok to the option "Reproject raster to view projection"
> everything crashes, when I say "change view projection to raster
> projection" the DEM is loaded but the projection of both the DEM and
> the view is:
> PROJCS "unnamed
> GEOGCS "Unknown datum based upon the Bessel 1841 ellipsoid"
> DATUM "Not_specified_based_on_Bessel_1841_ellipsoid"
> PROJECTION "Transverse_Mercator"
> 
> I don't understand where and why gvSIG has a problem with this and
> most important, how can I fix this?
> I tried to reproject the DEM but here again it crashes.
> Can anyone please help me?
> 
> Thea
> 
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