[Proj] Triangulation Point Lists

Jose Gonçalves jagoncal at gmail.com
Fri Aug 21 16:46:53 EST 2009

The Portuguese Geographic Institute provides the coordinates of more than
1000 trigonometric points in Portugal.
They can be queried by name, map sheet or proximity to localities on the
address (in portuguese only):


They are also available in Google Earth through a KMZ file available on the
following address:


Data provided includes ETRS89 coordinates, point description and photograph.

Jose' A. Gonçalves

2009/8/21 Irwin Scollar <al001 at uni-koeln.de>

> France, Belgium and the UK now offer free access
> to their databases of trigonometric points for their triangulations:
> http://www.geoportail.fr/visu2D.do?ter=metropole
> (zoom in, then open Sites Géodésiques in the left window)
> http://www.ngi.be/gdoc/default_fr.htm
> (select an area)
> http://benchmarks.ordnancesurvey.co.uk/pls/htmldb/f?p=111:13:6255072357299077241::NO::P13_QUERY_BY:LandrangerSheetNumber
> (query by 1:50000 map sheet number) from
> http://leisure.ordnancesurvey.co.uk/products/paper-maps/paper-maps-ordnance-survey-great-britain/paper-maps-ordnance-survey-great-britain-os-landranger-map
> If anyone knows of other countries anywhere in
> the world offering similar free access to their
> triangulation point database, perhaps in response
> to the European Union INSPIRE directive which is now in force,
> http://inspire.jrc.ec.europa.eu/
> please post the links on this list or send them to me off-list if you
> prefer.
> Irwin Scollar
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