[Mapserver-users] Projection woes, Revisited.

[Ed McNierney]

Chip -

The PROJ4 FAQ refers to the work you need to do to have the NAD datum shift files built - the code doesn't change.  Do you have your PROJ installation in C:\PROJ?  Whereever it is, look in that directory for a NAD subdirectory and files named CONUS, NAD27, NAD83, ALASKA, etc. (no file extensions).  You need to have these datum shift files set up and PROJ pointed to them in order to do the shift.

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 


-----Original Message-----
From: Hankley, Chip [mailto:Chip.Hankley at gasai.com]
Sent: Tuesday, February 04, 2003 12:17 PM
To: MapServer List (E-mail)
Subject: [Mapserver-users] Projection woes, Revisited.


OK, I'm still unable to do a datum shift between NAD27 and NAD83.

I've tried to strip out all of the non-essentials and come up with an
example. You can view it on-line at:

http://207.250.243.23/projtest/projtest.html

Basically, I can reproject data FINE when it's in the same datum. It's when
I try to do a datum shift that things don't work. I'm using one of the
pre-compiled binaries from the MS site. Here's my version info:

MapServer version 3.6.3 OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP SUPPORTS=PROJ
SUPPORTS=TTF SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT INPUT=TIFF INPUT=EPPL7
INPUT=JPEG INPUT=OGR INPUT=SHAPEFILE 

Could the problem be with the way PROJ4 was compiled into this binary? The
PROJ4 FAQ has some specific instructions for building PROJ4 to support datum
shifts... (see http://www.remotesensing.org/proj/faq.html). I don't know how
to check this on the binary...

TIA!

Chip
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