[Proj] Portuguese Modified Grid - Datum 73

Roger Oberholtzer roger at opq.se
Tue Feb 16 10:14:12 EST 2010

On Tue, 2010-02-16 at 14:53 +0100, OvV_HN wrote:
> Dunno, but doesn't the utm projection uses a couple of preset values for 
> lat_0, k_0, x_0, y_0, and a calculated value of lon_0?
> The tmerc projection seems more appropriate.

You are surely correct. I will give this on a shot:

+proj=tmerc +lat_0=39.66825833333333 +lon_0=-8.133108333333334 +k=1 +x_0=180.598 +y_0=86.990 +ellps=intl +units=m +no_defs

Too bad it is always so hard to get appropriate test data for

Roger Oberholtzer

OPQ Systems / Ramböll RST

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