Debian Proj upstream source notes --------------------------------- The Debian Proj package comes with both proj4 upstream and additional datum grids (http://download.osgeo.org/proj/proj-datumgrid-1.4.zip at the time of this file) in a single package. A note about datum grids you can find in nad/ directory and datumshifts.shar archive is mandatory. All those data are public domain, taken and collected from various US/Canada, France, Switzerland and New Zealand public domain resources. Most of them are available in ASCII form, and some use a NTv2 binary format. The NTv2 format is a documented format used by some tools freely available by various sources: some of them are binary-only, other are available in source form. As references about data origins consider the following: Australia: http://www.icsm.gov.au/icsm/gda/gdatm/index.html France: http://www.stjohnspoint.co.uk/gis/france.htm Canada: http://www.geod.nrcan.gc.ca/tools-outils/ntv2_e.php Germany: http://crs.bkg.bund.de/crseu/crs/descrtrans/BeTA/de_dhdn2etrs_beta.php UK: http://lists.maptools.org/pipermail/proj/2006-November/002658.html New Zealand: http://www.linz.govt.nz/geodetic/software-downloads/index.aspx Switzerland: http://www.swisstopo.admin.ch/internet/swisstopo/en/home/topics/survey/lv03-lv95/chenyx06/distortion_grids.html -- Francesco Paolo Lovergine Wed Nov 26 10:52:29 CET 2008