On Tue, May 29, 2012 at 7:38 AM, Etienne Tourigny <etourigny....@gmail.com> wrote: > Hi list, > > It seems that the +b parameter of Proj.4 strings generated by gdal can > have different precisions, dependent on the architecture (i386 vs. > ams64) for various linux flavors and gdal versions (1.6 - 1.9). > > The CRS from EPSG:4131 can have slightly different values: ( > +b=6356075.413140239 vs. +b=6356075.41314024 ) > > i386: > +proj=utm +zone=48 +a=6377276.345 +b=6356075.413140239 > +towgs84=198,881,317,0,0,0,0 +units=m +no_defs > > amd64: > +proj=utm +zone=48 +a=6377276.345 +b=6356075.41314024 > +towgs84=198,881,317,0,0,0,0 +units=m +no_defs > > > ==> Can this happen with other values?
Etienne, I imagine it can, though this value is particularly sensitive to it since it is computed. > ==> Is it an artifact of the calculation of the semi-minor axis from > semi-major and inv-flattening in ogr_srs_proj4.cpp ? > ==> Is this a bug? In my opinion it is not a bug. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Software Developer _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev