Re: [DebianGIS] Fw: Re: [Proj] NAD27 and WGS84 woes
On Mon, Nov 24, 2008 at 08:03:13PM -0800, Hamish wrote:
> 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.
> "
>
But for technical relevance of providing the datum shits at compile time,
someone should be able to provide licesing information about that beast.
There are a couple of blobs there too, whose origin and format are not
clear. I doubt a proj-data could be releasable as is in main. Pre-depending
on that is out of discussion for plain proj4. I would avoid a battle against
ftpmasters for such a thing.
> 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.
>
>
> > 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.
> [...]
--
Francesco P. Lovergine
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