Am 17.05.2013 19:00, schrieb Thomas Campagne:
When I run cs2cs -v +init=epsg:4267 I still do not understand how the
+nadgrids=@conus,@alaska,@ntv2_0.gsb,@ntv1_can.dat parameter is being
generated as I cannot find it within the text/csv files.
EPSG:4267 expands to
+proj=longlat +datum=NAD27 +no_defs
and the nadgrids are in the "+datum=NAD27". This is hardcoded in
<http://trac.osgeo.org/proj/browser/trunk/proj/src/pj_datums.c>
"NAD27", "nadgrids=@conus,@alaska,@ntv2_0.gsb,@ntv1_can.dat",
"clrk66",
"North_American_Datum_1927",
Any idea about which files to edit to add the nadgrids parameter to
the proj string referenced by a given EPSG code (4202 for AGD66 as
example)?
You could add a line for AGD66 datum and nadgrid file in the file, and
compile from source. And you have to change the share/proj/epsg file to
use your datum istead of +towgs84.
Or try to insert the +nadgrids=<filename> for the AGD66 entry directly.
HTH,
André Joost
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