[Mapserver-users] center map on x,y coordinates

Paco Regodon mapserver at meteologica.es
Tue May 4 10:04:58 EDT 2004

The scale parameter is not clear, as it is related with RESOLUTION.

If your units are meters, you can calculate your escale using this formula:

scale = ((EXTENT * 100) * RESOLUTION / 2.54 ) / image_width_in_pixels.

RESOLUTION defaults to 72 dpi (dots per inch) but you can change it in the 
mapfile if you need to.
Just try a big scale (scale=15000000).

Have you tried using MAPXY/BUFFER instead of MAPXY/SCALE?


On Tuesday 04 May 2004 11:24, Elisabeth Nolz wrote:
> hi list.
> in my application i have a drop-down menu with lots of addresses (addresses
> and appropriate x,y coordinates stored in a mysql-database). the user can
> choose one address and then click on the submit-button to show the map
> centered on the chosen address.
> the problem is, that i don't know how i could center my map on x,y
> coordinates.
> i found the following entry in the mapserver-user-history:
> "If you have x,y coordinates for the centers of your parcels in your mysql
> database, you can just run your search, grab the results, and redirect to a
> url like:
> http://myserver.com/cgi-bin/mapserver?map=parcel.map&mapxy=x_from_mysql+y_f
> i tried this link with my coordinates but it doesn't work this way. could
> someone help me please?
> thx,
> elisabeth.
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> Mapserver-users at lists.gis.umn.edu
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