[Proj] OSTN02 question: GRS80 instead of Airy.
Roger Oberholtzer
roger at opq.se
Mon Oct 30 10:34:08 EST 2006
No takers on this one?
On Wed, 2006-10-25 at 12:58 +0200, Roger Oberholtzer wrote:
> I use the C API to do transformations. I am converting from GPS values
> in WGS84 to OSTN02 for the United Kingdom. My current code is:
>
> fromProj = pj_init_plus(
> "+proj=latlong "
> "+ellps=WGS84 "
> "+towgs84=0,0,0 "
> "+nodefs")
>
> toProj = pj_init_plus(
> "+proj=tmerc "
> "+lat_0=49 "
> "+lon_0=-2 "
> "+k=0.9996012717 "
> "+x_0=400000 "
> "+y_0=-100000 "
> "+ellps=airy "
> "+nadgrids=gb.gsb "
> "+units=m "
> "+no_defs")
>
> Note that I do a grid shift, using data provided by a kind member of
> this list.
>
> My question is, how can I use the GRS80 ellipsoid instead of Airy?
>
>
--
Roger Oberholtzer
OPQ Systems AB
Ramböll Sverige AB
Kapellgränd 7
P.O. Box 4205
SE-102 65 Stockholm, Sweden
Tel: Int +46 8-615 60 20
Fax: Int +46 8-31 42 23
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