[postgis-users] Distance from point inside polygon to closest edge of the polygon

[Chris Story]

Michael,
ExteriorRing doesn't seem to work. Maybe this is due to the_geom being a
multi-polygon? This returns something, but I'm not sure if it is correct.
Could anyone tell me?


SELECT distance(transform(GeomFromText( 'POINT(-81.0571731786471
28.0183613937886 )', 4326 ),utmzone(GeomFromText( 'POINT(-81.0571731786471
28.0183613937886 )', 4326 ))),
boundary(transform(the_geom,utmzone(GeomFromText( 'POINT(-81.0571731786471
28.0183613937886)', 4326 ))))) FROM "S_FIRM_PAN" where gid = 743;

On 7/30/07, Michael Fuhr <mike at fuhr.org> wrote:
>
> On Mon, Jul 30, 2007 at 08:43:34PM -0500, Chris Story wrote:
> > I am attempting to determine the distance from a point inside a polygon
> > to the edge of the polygon. How can I achieve this?
>
> Have you tried distance(point_geom, exteriorring(poly_geom))?
>
> --
> Michael Fuhr
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>



-- 
Thank you,

Chris Story
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