[Proj] Belge 1972 / Belgian Lambert 72 (31370) -towgs84parameters
j.l.h.hartmann at uva.nl
Thu Jan 28 14:31:58 EST 2010
For RD I use: +proj=sterea +lat_0=52.15616055555555
+lon_0=5.38763888888889 +k=0.999908 +x_0=155000 +y_0=463000
Yours is a older, slightly different version from the EPSG database. In
practice, it doesn't make much difference, both are accurate up to about
For a converter between Dutch and a number of neighboring projections, see:
On 28-1-2010 14:21, Roger Oberholtzer wrote:
> OOC, how do you configure proj for RD? I am using this (WGS84 Lat/Long
> is the source) in the C-API:
> "+proj=sterea "
> "+lat_0=52.15616055555555 "
> "+lon_0=5.38763888888889 "
> "+k=0.9999079 "
> "+x_0=155000 "
> "+y_0=463000 "
> "+ellps=bessel "
> "+units=m "
> I just want to verify that nothing has gone wrong in my library. Bit rot
> and all that.
> Is there a good (official?) set of test data for RD? Something that has
> WGS84 lat/longs, and the corresponding RD northings/eastings. I can
> never have too many tests!
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