Andreas Joisten a écrit :
Hi all,
The BNG (British Natial Grid) based on the airy Ellipsoid but GDAL did not know
this parameter.
+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +datum=OSGB36 +units=m +no_defs
Probably, gdal does not know this parameter: +ellps=airy
Hello,
You don't need to specify the ellipsoid, because it is already contained
in the datum definition :
proj -v +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000
+y_0=-100000 +datum=OSGB36 +units=m +no_defs
#Transverse Mercator
# Cyl, Sph&Ell
# +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000
# +datum=OSGB36 +units=m +no_defs +ellps=airy
# +towgs84=446.448,-125.157,542.060,0.1502,0.2470,0.8421,-20.4894
Jean-Claude
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