Finding the maximum distance between two polygons from a set is going to
be very slow. Also, there's no built-in function to do this, so you'd
have to code it up yourself.
It would be faster to find the bounding box of all the geometries and
use that to determine a visibility area.
Kevin Kempfer wrote:
Hello!
I have to find out which polygons have the longest distance between any
two polygons (or points of them) from a set of multiple polygons. For
example:
I have 5 polygons.
Find out where's the biggest distance between them and give back the two
points.
I need this to be able to zoom in/out my map application to a zoom level
where all polygons are visible to the user.
Is this possible using build-in postgis functions or do I have to write
my own?
Best regards,
Kevin
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--
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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