[postgis-users] points from st_distance

[Martin Davis]

>
> On the topic itself, this is doable, but note that distance does not
> calculate the shortest distance points (sometimes they are between
> vertices, note) it just calculates the segmentA/segmentB distances and
> finds the minimum.
>   
This is how the JTS algorithm works as well.  It is possible to identify 
the points which determine the shortest distance, and it's not too hard 
to do.  I added this to JTS once I realized that this is quite useful 
for visualizing the distance.
>   

-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022