[mapserver-users] GPX file viewer with mapserver

[Tran Tho Ha]

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 <Jukka.Rahkonen at mmmtike.fi>
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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