[Proj] OSTN02 question: GRS80 instead of Airy.
Roger Oberholtzer
roger at opq.se
Wed Oct 25 06:58:14 EDT 2006
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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