Hi Nikos and Paul thanks a lot for your help and notes. I will test the parameters and write back then. Maybe then, we can add the datum parameters to grass svn.
Regards, Otto On Thu, 13 Dec 2007 13:51:17 +0000 (GMT) Paul Kelly <[EMAIL PROTECTED]> wrote: > On Thu, 13 Dec 2007, Otto Dassau wrote: > > > Hi, > > > > I need some help to add support for "Hong Kong 1980" datum in GRASS. I > > have a wkt file with following information: > > > > PROJCS["Hong_Kong_1980_Grid",GEOGCS["GCS_Hong_Kong_1980",DATUM["D_Hong_Kong_198 > > 0",SPHEROID["International_1924",6378388.0,297.0]],PRIMEM["Greenwich",0.0],UNIT > > ["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["Fal > > se_Easting",836694.05],PARAMETER["False_Northing",819069.8],PARAMETER["Central_ > > Meridian",114.1785555555556],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_ > > Of_Origin",22.31213333333334],UNIT["Meter",1.0]] > > > > The datum D_Hong_Kong_1980 does not exist in GRASS yet. I found following > > parameters and added them to the datum.table file: > > > > # Hong Kong Datum 1980 > > hk80 "Hong_Kong_1980" international dx=-156 dy=-270 dz=-189 > > > > Now I am missing the Datum Transformation Parameters to add to the > > datumtransform.table. > > Just to note that you do not necessarily need to add parameters to both > datum.table and datumtransform.table. If dx=-156 dy=-270 dz=-189 are > the only parameters you have, that is fine and they will be the only ones > used. An entry in datumtransform.table is only needed if you have multiple > sets of parameters for the datum, or if the only set you have available is > not a 3-parameter set. > > Paul _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
