[postgis-users] inside of a geometry

[Paul Ramsey]

A negative buffer will work, it'll just be unpleasantly slow, and not  
really workable at multiple scales unless you re-buffer on the fly at  
size consistent with your current scale. It really should be solved  
at the mapserver level, during rendering, not with geometry hacks  
like buffer.

P.

On 19-Jan-06, at 11:46 AM, Stephen Woodbridge wrote:

> 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.
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