[DebianGIS-dev] Bug#458369: Bug#458369: PROJ debian package: include grid shift datum files?
Francesco P. Lovergine
frankie at debian.org
Wed Nov 26 15:59:53 UTC 2008
On Tue, Nov 25, 2008 at 12:05:43PM -0800, Michal Migurski wrote:
> On Nov 25, 2008, at 8:34 AM, Peter S Galbraith wrote:
>
> > Yikes... Sorry Michal. I guess I dropped the ball on this one.
> > As a note to myself, the FAQ
> >
> > http://trac.osgeo.org/proj/wiki/FAQ
> >
> > says:
> >
> > After downloading and unpacking the PROJ.4 source, also download and
> > unpack the set of datum shift files. This would be a file like
> > ftp://ftp.remotesensing.org/pub/proj/proj-datumgrid-1.4.zip. This
> > file
> > should be unpacked within the proj/nad directory. Then proceed with
> > the
> > configuration, build and install. This will ensure that the build
> > system
> > knows about the grid shift files, and applies the ascii to binary
> > preprocessing step.
> >
> > Peter
>
>
> Thank you!
>
As said off list, I see a couple of problems:
- Three files are binary blobs, two NTv2 and one (maybe?) NTv1. I'm not too
sure that differences in endianess are considered, it needs some checks.
- It would be better having a decent summary of data provenances of those
information. I see many GIS people are not too interested in the license
aspect of projection data (see the EPSG case) but Debian cares. Currently
I wrote something like this:
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 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
--
Francesco P. Lovergine
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