[ms4w-users] Re: ms4w, GDAL_DATA and ogr

Jeff McKenna jmckenna at dmsolutions.ca
Fri Apr 1 13:19:57 EST 2005

Hi Richard,

This is an interesting one, so i've CC'd the FWTools list as well for 

What i do know is that the GDAL_DATA environment variable is used for 
GDAL to find supporting files.  For MS4W, GDAL_DATA is set to 
/ms4w/tools/ogr-utils because that directory contains supporting files 
for S57 data.  But i now see that /FWTools0.9.6/data/ does contains many 
more reference files.

Are those missing reference files in MS4W causing your problem? 
Hopefully someone from the FWTools list can help us out.

PS. For MapServer debugging I add the following to my httpd.conf:

   SetEnv MS_ERRORFILE "/ms4w/tmp/ms_errorfile.txt"


Richard Duivenvoorde wrote:
> Hi list,
> hope this is usefull for somebody:
> I'm using fwtools and ms4w.
> Wanted to use a Virtual Datasource (OGRVRTDataSource) from a textfile 
> based pointlayer, where the points where in coordinate system epsg:28992 
> (dutch coordinate system).
> Using fwtools ogrinfo (only in the fwtools terminal) I was able to read 
> and report about the coordinates in the file.
> But using the same file in ms4w mapserver for a layer failed. Changing 
> the projection to WGS84 did succeed in both scenario's. My conclusion: 
> it has something to do with the projection / epsg.
> Finally it appeared that the GDAL_DATA environment variable for apache 
> was set to: "c:/ms4w/tools/ogr-utils": the ogr-utils directory as it 
> comes with ms4w. Using this didn't succeed in a map.
> But when I changed the GDAL_DATA environment setting in the httpd.conf 
> to the data dir of fwtools I had a map:
> SetEnv GDAL_DATA "c:\programs\FWTools0.9.6\data"
> Question:
> 1) are the files in the ms4w ogr-utils missing the right epsg 
> information? Or did I make another mistake here...
> 2) I couldn't find any (debug) or error information in the apache or 
> other logfiles. How will I be able to see error information in the 
> future from ogr or gdal?
> Thanx
> Richard

Jeff McKenna
DM Solutions Group Inc.

More information about the ms4w-users mailing list