[Mapserver-users] How to get the x y value of a pixel from the tiff file by mapserver

[Steve Lime]

Yes you can. 

One way is to set up a dummy shapefile (1 big polygon consisting of
4 points, a rectangle) that is larger than the extent of your image
dataset. With that file
you have something to query since you can't query raster layers. Then
you can create
a query template and use the [mayx] [mapy] substitutions to get at the
mouse click. There
are also [maplat] [maplon] substitutions to get lat/lon if you have
proj.4 support.

Another way to do this would be to actually switch template files. So,
if a user want's just
the xy coordinate you use a template file that doesn't actually show a
map, but just uses
the substitutions mentioned above.

There also used to be a showxy mode, but it's undocumented and I'll
have to look at source
to tell you how to use it.

Steve

Stephen Lime
Data & Applications Manager

Minnesota DNR
500 Lafayette Road
St. Paul, MN 55155
651-297-2937

>>> "pond bear" <pond_bear at hotmail.com> 01/23/03 05:32PM >>>
I succeeded to compile mapserver and run it on my Redhat 7.3 machine.
Now I 
can show a tiff image by mapserver and zoom in or zoom out.
Can I get the x/y value or latitude/longitude value when I click on the
tiff 
image?






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