[Mapserver-users] Projection woes, Revisited.

[Hankley, Chip]

Ed,

You are right... now that I know the right answer, going back and re-reading
the documents on the PROJ4 site allowed me to reproduce the PROJ4 directory
you supplied.

I guess what was confusing to me (and I imagine might be to others) is that
you need to compile PROJ4 (and compile it with the extra nadshift target) in
order to get the datum shifting functionality of PROJ4.

At first glance, when downloading the pre-compiled binaries from the MS
site, it appears that all you need to do is put the enclosed epsg file in a
directory called C:\Proj\Nad, and everything will work. What's further
confusing about this, is that this DOES work, until you try to do a datum
shift.

I might suggest to the folks that are responsible for maintaining the site
that they include in the windows binaries section a zip file that contains
the entire built PROJ4 directory (with NAD27<>83 datum shifting support),
with instructions that it should be unzipped to C:\PROJ.

In the meantime, I will add a page to the WIKI.

Chip

> -----Original Message-----
> From: Ed McNierney [mailto:ed at topozone.com]
> Sent: Tuesday, February 04, 2003 7:01 PM
> To: Hankley, Chip
> Cc: MapServer List (E-mail)
> Subject: RE: [Mapserver-users] Projection woes, Revisited.
> 
> 
> Chip -
> 
> This is a good answer (although you might not think so <g>).  I would
> have been very unhappy if the executable made a different.
> 
> I haven't looked lately, but I thought there were reasonable pointers
> that indicated that you needed to have PROJ set up properly if you're
> going to be using PROJ support in MapServer.
> 
> PROJ can be a little awkward and antiquated in the way it's 
> set up, but
> it's not really too bad.  One does need to understand a bit more than
> might be necessary about the mechanics of datum shifts, but I didn't
> think it was all that bad.
> 
> Have you looked at the PROJ site (on remotesensing.org) and looked at
> the setup/install instructions?  If they need updating, I'm sure your
> input would be very much appreciated; perhaps the MapServer 
> pages simply
> need a louder, clearer link that points out the slightly non-trivial
> nature of a PROJ install, and refers the reader to the PROJ site for
> instructions.
> 
> 	- Ed
> 
> Ed McNierney
> President and Chief Mapmaker
> TopoZone.com / Maps a la carte, Inc.
> 73 Princeton Street, Suite 305
> North Chelmsford, MA  01863
> Phone: (978) 251-4242  Fax: (978) 251-1396
> ed at topozone.com
> 
> 
> -----Original Message-----
> From: Hankley, Chip [mailto:Chip.Hankley at GASAI.Com] 
> Sent: Tuesday, February 04, 2003 5:50 PM
> To: Ed McNierney
> Cc: MapServer List (E-mail)
> Subject: RE: [Mapserver-users] Projection woes, Revisited.
> 
> OK, Thanks a lot Ed...
> 
> Not sure if I should be happy (I am), or frustrated (I am). Anyway,
> here's
> what happened.
> 
> I took Ed's PROJ tree, and simply replaced mine. Once this 
> was done, it
> worked. A quick look at 
> 
>   http://207.250.243.23/projtest/projtest.html
> 
> will verify this.
> 
> This is NOT using the new 3.7 executable... all I did was replace the
> contents of the PROJ directory. This is really worth noting somewhere.
> Where
> is one supposed to get all of the stuff that's in the PROJ directory?
> Does
> that come from the remote sensing site? Anyway, if someone can clear
> these
> questions up for me, I will put a detailed windows - PROJ 
> setup page in
> the
> WIKI.
> 
> Chip
>