[mapguide-internals] MapGuide RFC 15 - New Query Features API

Jason Birch Jason.Birch at nanaimo.ca
Fri Feb 2 19:06:21 EST 2007

I think this is a great idea, but...

Will there be any way to disable this behaviour in the viewer?  I don't
know if I want selected parcels showing up on the map at extreme zoom
levels.  Talk about ugly.

This is not a feature request.  From a cartographic standpoint I'd love
to see something like this:

Representation thresholds.  Set zoom levels where adjacent polygonal
features are merged into a single polygon, and then turn into a
symbolized point feature.  For instance, consider a Hospital:
- at 1:5000, all buildings in the hospital complex are represented, and
labelled with the word "Hospital"
- at 1:10000, these buildings are aggregated into a single rubber-band
polygon, labelled with the letter "H" in a blue circle
- at 1:15000, the hospital is represented by a letter H in a blue
circle, positioned at the center of gravity of the original features

The trick is that all just different representations of the same
feature, so selection would be maintained, and geometry operations would
be applied to the true geometry, not the simplified representation.

I'm already doing this to a certain extent manually, but it would be
nice to not have to maintain multiple copies of the same data just for
display's sake, and with this method there is no way of maintaining
selection status from one scale range to the next.


-----Original Message-----
Subject: [mapguide-internals] MapGuide RFC 15 - New Query Features API

Hi Everyone,

We would like to submit the following RFC for open discussion and


Please respond to the list with any feedback and we will be happy to



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