Symbolizing FeatureQuery

[David Stajan]

On Fri, 1 Jul 2005 03:12:15 +0000, Richard Greenwood
<richard.greenwood at GMAIL.COM> wrote:

>David Stajan <dls <at> INFORMGIS.COM> writes:
>
>>
>> Hi Group,
>>
>> I'm tying to perform theme on theme selections using the cgi
featurequery
>> mode.  For example I have a polygon layer and a line layer, and I want
to
>> select all the lines that fall within a selected polygon.  The
>> featurequery mode works, however I was wondering if there is a way to
>> symbolize the selected polygon differently from the selected lines in
the
>> query map.  Right now I get all the selected features (polygon and
lines)
>> symbolized in the same color.  Even better would be if its possible to
>> perform this type of query and only have the selected lines returned and
>> not include the polygon the the query results.  Is this possible with
>> mapserver cgi or can I get this kind of result using some other kind of
>> method?
>
>I have not done exactly what you are trying to do, but I have done
something
>similar enough so that I am confident that it can be done easily in CGI
mode.
>
>The lines and polygons are in separate shape files (or PostGIS tables)
but are
>symbolized in 2 different layers in the map file; one layer for general
display
>and a 2nd layer with a filter to hi-light query results.
>
>Pusedo code:
>1. general polygon display (shows all the polygons, all the time)
>      class w/ symbol for regular display of all features
>2. general line display
>      class w/ symbol for regular display of all features
>3. line results (hi-lights selected lines )
>      status default (so it's always displayed)
>      filter %result% (so only query results are displayed
>
>I know that's a pretty general answer, but your question is pretty
general, too.
>If my response doesn't make sense , follow up with more specifics.
>
>Rich
>

Hey you've come through again Rich, Thanks!  I'm not a big fan of having
all these duplicate layers in the mapfile, as it makes a dynamic layerlist
a little more challenging.  But it seems that's the trick to give
mapserver a more desktop-like gis feel and functionality. Do you have an
example of your methodology that I could check out.

Thanks,

DaviD