[Gvsig_english] gvSIG and OSGB36 (EPSG:27700)

[Nick Hopton]

I have recently installed gvSIG Version 1.11.0 (Build 1305) running
under Ubuntu 11.04 (amd64). On checking the Proj4
parameter string that gvSIG uses for EPSG:27700 I found that it was
thus:

PROJ4 string: +proj=tmerc +lat_0=49.0 +lon_0=-2.0 +k=0.9996012717
+x_0=400000.0 +y_0=-100000.0 +ellps=airy +units=m

This string does not include the '+datum=OSGB36' parameter and as a
result the datum shift between OBSG36 and WGS84 will not be applied.
If I recall correctly, the shift between the two datums is something
like 112 metres at Greenwich.

This was a known problem with older versions of Proj4.

Is there any way to edit the parameter string that gvSIG?

Regards,
Nick.



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