[postgis-users] inside of a geometry

[Stephen Woodbridge]

Brent Pedersen wrote:
> hi, this may be a mapserver problem, but i'm trying to display the 
> OUTLINE's of a polygon layer color coded according to an attributes. 
> the problem is that the adjacent polygons essentially share a border so 
> only one of those polygon's border's is visible:
> http://giifweb.cnr.berkeley.edu/fire/geoFRAP/060_247802000000.png  
>  (ignore the circle)
> 
> i tried using expand(the_geom, -0.1), but that doesn't work. is there a 
> postgis to get the inner boundary of a polygon? (or a mapserver method 
> to accomplish same?

expand only works on the bbox of the geometry. You might try buffer with 
a negative number, but I suspect that will not work either.

-Steve W.