[DebianGIS] Fw: Re: [Proj] NAD27 and WGS84 woes
fwd from the PROJ4 ML re. a "proj-data" package; the datum distortion grid
data files can be found here:
ftp://ftp.remotesensing.org/proj/proj-datumgrid-1.4.tar.gz
release thread:
http://www.nabble.com/proj-datumgrid-1.4-issued-td18581042.html
README.NADUS says:
" US/Canada/New Zealand Datum Shifting Files
------------------------------------------
To build, and install proj with US NAD83/NAD27 datum shifting support, it
is necessary to place these in the proj/nad directory before configuring,
building, and installing proj.
These files should work with pretty much any version of PROJ.4, but are
known to work with PROJ 4.3.x and PROJ 4.4.x.
"
so the proj package would need to build-depends on proj-data; I've no idea
of the consequences of the grid files being missing at run time if only
the proj package is installed on the user's system.
Also, I don't know if it is relevant, but ISTR that GRASS processes the
ascii files to binary in an endian sensitive way.
Hamish
----------------------------------------
--- On Sat, 11/22/08, Frank Warmerdam wrote:
> From: Frank Warmerdam
> Subject: Re: [Proj] NAD27 and WGS84 woes
> To: "PROJ.4 and general Projections Discussions"
> Date: Saturday, November 22, 2008, 8:16 PM
>
> Michal Migurski wrote:
> > Isn't it the case that without the datum shift
> files, proj outputs the wrong numbers? Why wouldn't
> these be included in the default build and debian package
> along with everything else?
>
> Mike,
>
> The datum shift files are large and only applicably in a few cases
> (north americans using NAD27). I try to package them in binary
> distributions I ship, but apparently by decision or by omission the
> Debian package maintainer decided otherwise.
>
> I would have hoped that they would at least have been available as an
> add-on package.
[...]
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