Thank you, Rahkonen Jukka. Your advice helps me to fix this problem. I was wrong in identification of EXTENT and layer data. By using "ogrinfo", I fixed it.
Best regards, Tran Tho Ha On Sun, Mar 16, 2008 at 2:57 PM, Rahkonen Jukka <[EMAIL PROTECTED]> wrote: > Tran Tho Ha wrote > > > Thanks Frank for your advice. > > I identified that I was using old version of MS4W. So when I upgrade to > MS4W > > 2.2.7, it works. At least, the errors I mentioned before didn't > occurred > > anymore. But I have another problem: I only get a blank image, instead > of a > > map. Can you suggest which things should I check for this error? > > I believe that the most common reason for getting an empty map is simply > that > there are no data on the area of the request. Check very first that your > request and mapfile are using the same projection and that the layer data > is > having a correct projection, which I believe to be always epsg:4326 for > gpx. > Then check that the mapfile extents are correct so that your data fall > inside. > I suggest to start with keeping everything in epsg:4326. Use ogrinfo to > see the extents of the data and put those values to mapfile EXTENT and to > your > request. > > -Jukka Rahkonen- > >
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