[Proj] Portuguese Modified Grid - Datum 73

Roger Oberholtzer roger at opq.se
Thu Feb 18 10:40:14 EST 2010

On Thu, 2010-02-18 at 13:24 +0000, Jose Gonçalves wrote:
> Hello
> Sorry, it was my mistake: it is in fact 39d40'. I edited the value in
> the epsg file, to convert decimal degrees to DMS, and made the
> mistake... The epsg file is ok.
> Some history about that projection: that central point was chosen at a
> mid latitude of the country and 1d00'00"E of the Lisbon Meridian
> (9d07'54.862"W). The small false easting/northing of a few hundred
> meters, which is quite unusual, was chosen in order to create
> projected coordinates similar to projected coordinates in an older
> datum (datum Lisboa).

I suspected the false values were for some such thing.

And I am glad about the 39d40'. Otherwise I would really have been

Thanks all for the help.

Roger Oberholtzer

OPQ Systems / Ramböll RST

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