[maplab-users] How do you display a layer by attribute?
zak-ms at hoppsan.org
Fri Jun 25 13:55:27 EDT 2004
You need to specify a separate class for each value or value range of
the attribute that you want to differentiate. Multiple Style objects
are used within each class to build layered symbolization (for instance
a star within a circle for point markers or a fill with a contrasting
outline for polygons). One serious bug that I can warn you about: don't
give a Style a name in Mapedit or it will break your mapfile. This
problem will be addressed in the upcoming release.
Applications and Software Development
DM Solutions Group Inc.
On Jun 25, 2004, at 1:05 PM, Ken Sanderson wrote:
> Hello all.
> How do you set up a map file through map edit to display a layer by an
> attribute value. So for example if I have a field called TYPE and in
> that field you can have a value of 1-4. I then want to display all 1's
> as red, 2's as blue, 3's as green, 4's as yellow on the map.
> How do I go about setting that up? I assumed that I would set ClassItem
> to TYPE, but not sure how to go about defining a style object for each
> value type could be?
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> Maplab-users at lists.maptools.org
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