displaying objects based on DBF information

[Stephen Lime]

This is what class objects are for. You can use class expressions to
restrict display to certain sets of features or to change the display 
characteristics (eg. color/size/symbol) for each "class". I've attached
a map file that I use to draw different highway shields based on an
item value. Look at the definitions for "major_roads".

Steve

>>> "Yeewen Sat" <yeewen at petromap.com> 01/15/01 03:35PM >>>
Hi,

I like to find out if mapserver CGI support this:

display objects based on specific DBF information?

As an example, DBF file contains a field named ObjectID. And, a map being
displayed has bunch of lines in it. When user zoom into the map, all lines
that fall inside the bounding rectangle will show up. Is there a way to tell
mapserver to draw only those lines that match the given ObjectIDs?

The same question applies to mapscript. Can I just pass these lines
ObjectIDs to some mapscript functions, and it will only plot these lines?

If mapserver cgi or mapscript does supports the above functions, can I get
some examples to get me started?

Thanks.
Yee Wen


Stephen Lime
Internet Applications Analyst

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

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