[Proj] Portuguese Modified Grid - Datum 73

[OvV_HN]

A couple of months ago I found the following document with descriptions of 
several Portuguese projections.
See page 22 for SHG73.

Projecções Cartográficas
João Matos
Departamento de Engenharia Civil e Arquitectura
(Versão 2.1) –7 Março 2007
<http://websig.civil.ist.utl.pt/jmatos/Modules/StandardToolkit/Documents/ViewDocument.aspx?Mid=744&ItemId=34>


Oscar van Vlijmen



----- Original Message ----- 
From: "Roger Oberholtzer" <roger at opq.se>
To: "PROJ.4 and general Projections Discussions" <proj at lists.maptools.org>
Sent: Tuesday, February 16, 2010 12:40 PM
Subject: [Proj] Portuguese Modified Grid - Datum 73


>I have been looking through the definition with proj4, as well as
> spatialreference.org, and I do not seem to see a proj4 definition for
> something called "Portuguese Modified Grid - Datum 73". I have a
> description for it, but I do not think it is complete:
>
> http://www.igeo.pt/produtos/Geodesia/inf_tecnica/sistemas_referencia/Datum_73.htm
>
> Anyone familiar with this?
>