[Mapserver-users] WMS BBOX vs. Actual Bounds

[John Gorkos]

Gee.. ask what time it is, wind up with a treatise on atomic clocks....

Thanks to all of you that offered bits of code and advice.  We're actually 
going with a hybrid Mapscript/Java Applet solution that should fit the bill 
for what we're looking for, along with some code that Steve Lime provided.  
Thanks, Steve.
  Thanks again for the lively discussion.

John Gorkos


On Wednesday 07 January 2004 12:20, John Gorkos spake thusly:
> Howdy-
>   My programming team is up against a hard deadline, and we're stymied.
> Basic project is this:  use a WMS mapserver to feed a java applet a base
> map, and then connect (via TCP) to a real-time management system that feeds
> us status of devices across the planet, coded by lat/long and a status
> code. These then get overlayed on top of the base map on a "glass pane"
> that can be changed without redrawing the base.  The result is little
> winkin', blinkin' lights on top of a map that show (in our case) whether or
> not electricity is on in various places across the US.
>   The problem is that when we send a BBOX request to the mapserver from the
> java applet, we don't get back a map with the exact coordinates we asked
> for. That's OK, I realize that mapserver gets as close as it can given the
> image size, but I've GOT to know what the real boundaries are so I can
> overlay my status dots on top.  How do I get this information back from the
> mapserver? On a related thread, how does the mapserver decide what the real
> boundaries are, when given when the bounds requested don't match the aspect
> ratio of the returned image?

-- 
John Gorkos
quidquid latine dictum sit altum viditur
  (anything said in Latin sounds profound)