[Proj] EPSG CS not supported, but the epsg file contains the correct definition

[Clifford J Mugnier]

The difference between the WGS84 ellipsoid and the GRS80 ellipsoid is less than 0.001 meters, and that is only for the semi-minor axis (b).  Consider them identical for all practical purposes.
 
Clifford J. Mugnier, C.P., C.M.S.
Chief of Geodesy,
Center for GeoInformatics
Department of Civil Engineering 
Patrick F. Taylor Hall 3223A
LOUISIANA STATE UNIVERSITY 
Baton Rouge, LA  70803
Voice and Facsimile:  (225) 578-8536 [Academic] 
Voice and Facsimile:  (225) 578-4578 [Research] 
Cell: (225) 238-8975 [Academic & Research]
Honorary Life Member of the 
Louisiana Society of Professional Surveyors 
Fellow Emeritus of the ASPRS 
Member of the Americas Petroleum Survey Group


________________________________

From: proj-bounces at lists.maptools.org on behalf of SAEZ Laurent - SG/SPSSI/CPII/DOM/ETER
Sent: Thu 07-Oct-10 11:29
To: proj at lists.maptools.org
Subject: [Proj] EPSG CS not supported,but the epsg file contains the correct definition



Hi all,

I have to add support for new CRS in my mapfiles.

New EPSG code, 4559 (Projected CRS for French Antilles - Guadeloupe and
Martinique) replaces 2989.
The ellipsoide is the only thing different (GRS80 instead of WGS84).

So I add the EPSG:4559 definition in my epsg file.
<4559> +proj=utm +zone=20 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m
+no_defs  <>

I use MapServer 5.6.5 with proj 4.7.0 (on Debian 64bits).

When I call a GetMap using EPSG:4559 the image rendered is "wrong".
EPSG:4559 and EPSG:2989 are almost identical and the images should be
approximately similar.
So, I test my EPSG code with testepsg.

If I don't specify the epsg file location ('/opt/mapserver/bin/testepsg'
EPSG:4559), I have :
"ERROR 6: EPSG PCS/GCS code 4559 not found in EPSG support files.  Is
this a valid
EPSG coordinate system?
ERROR 1: Error occured translating EPSG:4559."

If I specify the file location ('/opt/mapserver/bin/testepsg'
'/opt/mapserver/share/proj/epsg' EPSG:4559)  :
"Validate Succeeds.
WKT[/opt/mapserver/share/proj/epsg] =
PROJCS["unnamed",
    GEOGCS["GRS 1980(IUGG, 1980)",
        DATUM["unknown",
            SPHEROID["GRS80",6378137,298.257222101],
            TOWGS84[0,0,0,0,0,0,0]],
        PRIMEM["paris",2.3372291666985],
...
...
...
UNIT["Meter",1],
    PARAMETER["standard_parallel_1",46.8]]
PROJ.4 rendering of [/opt/mapserver/share/proj/epsg] = +proj=lcc
+lat_1=46.8 +lat_0=46.8 +lon_0=2.33722917 +k_0=0.99987742 +x_0=600000
+y_0=2200000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +pm=2.3372291666985
+units=m +no_defs

ERROR 6: EPSG PCS/GCS code 4559 not found in EPSG support files.  Is
this a valid
EPSG coordinate system?
ERROR 1: Error occured translating EPSG:4559."

I use to add EPSG codes in my mapfiles. It's the first time I have this
problem.

It seems that sometimes it is not sufficient to add a definition in the
file EPSG...
I have read this thread ("Unsupported SRS but available in epsg file") :
http://www.mail-archive.com/gdal-dev@lists.osgeo.org/msg04926.html

My GDAL_DATA environnement variable is well defined. I tried to add the
definition in cubewerx_extra.wkt without success.
Any idea ?

I send this message on this list but I can't know what application is at
issue: GDAL or PROJ?

NB: I apologize for my bad English.




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