[Gvsig_english] problems with on-the-fly projection

[Marcus C. England]

Hi Moritz,

GvSIG only reprojects vector data, not raster data. My understanding is 
that they hope to have this for rasters soon.

-Marcus

Moritz Lennert wrote:
> Hello,
>
> I have some trouble with on-the-fly projection: using gps data coming in
> WGS84 (epsg 4326) and a topographic map in Belgian Lambert (epsg 31370),
> the two do not superpose correctly.
>
> When importing the data into GRASS, I get perfect superposition. And when
> I import the gps data into a GRASS 4326 location and the same data into a
> 31370 location, then reproject from one to the other, I also get perfect
> superposition of the two versions of the gps data. However, when I export
> to shapefiles from both locations and then load them in gvSIG indicating
> their respective projections, I get a difference of about 100m.
>
> Hamish Bowman suggested on the GRASS-users list that such a difference
> hints at an issue with datum transformation.
>
> I get the same kind of error using on-the-fly projection in QGIS.
>
> Moritz
>
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