I was thinking of something like this, but it doesn't work. Unfortunately Geoserver doesn't have the ability to create offset lines, so there's no nice way to do this without doing a little negative buffer on the shape (which incidentally, you could do using the geometry transformation facility on the fly http://docs.geoserver.org/stable/en/user/styling/sld-extensions/geometry-transformations.html
P <?xml version="1.0" encoding="ISO-8859-1"?> <StyledLayerDescriptor version="1.0.0" xmlns="http://www.opengis.net/sld"; xmlns:ogc="http://www.opengis.net/ogc"; xmlns:xlink="http://www.w3.org/1999/xlink"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xmlns:gml="http://www.opengis.net/gml"; xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd";> <NamedLayer> <Name>USA states</Name> <UserStyle> <Name>population</Name> <Title>United States</Title> <Abstract>A Simple Brush Style</Abstract> <FeatureTypeStyle> <Rule> <LineSymbolizer> <Stroke> <GraphicStroke> <Graphic> <ExternalGraphic> <OnlineResource xlink:type="simple" xlink:href="file:///Users/pramsey/green_bottom.gif" /> <Format>image/gif</Format> </ExternalGraphic> </Graphic> </GraphicStroke> <CssParameter name="stroke-linecap">round</CssParameter> <CssParameter name="stroke-dasharray">1 0 1 0</CssParameter> </Stroke> </LineSymbolizer> </Rule> </FeatureTypeStyle> </UserStyle> </NamedLayer> </StyledLayerDescriptor> On Tue, Feb 28, 2012 at 12:00 PM, Robert Buckley <robertdbuck...@yahoo.com> wrote: > Thanks for the advice. > > Unfortunately I don´t understand what you have just told me....half-brush? > half-circle? > > are these sld specifications?...I am delivering wms data using sld´s to > style the data. > > could you please clarify? > > cheers, > > Rob > > ________________________________ > Von: Paul Ramsey <pram...@opengeo.org> > An: Robert Buckley <robertdbuck...@yahoo.com>; PostGIS Users Discussion > <postgis-users@postgis.refractions.net> > Gesendet: 19:20 Dienstag, 28.Februar 2012 > Betreff: Re: [postgis-users] how to create a hole in a polygon table? > > Rather than geometry processing, work on your rendering engine. You > can usually achieve an interior band (the classic National Geographic > political boundary, yes?) with a half-brush (rather than a full > circle, use a half-circle), and just ensuring your polygons are > consistently oriented. > > P. > > On Tue, Feb 28, 2012 at 10:04 AM, Robert Buckley > <robertdbuck...@yahoo.com> wrote: >> Hi, >> >> I am trying to create an inner buffer of a polygon geometry table. >> Unfortunately this is the only way I can think of which will enable me to >> make a certain symbol for a polyon layer. The SLD Filter "difference" >> might >> do it, but it needs to be nested and i´m not sure if this is possible. >> >> anyway....My polygons need to be symbolized with a thin outline AND an >> inside Buffer of 3 mm(150m at a scale of 1:50 000)....in essence just an >> inside ring. >> >> This means I need to first buffer my polygon geometry and then substract >> the >> buffer from the original polygon. = ST_Difference (i think!?!) >> >> my attempt created some geometries but not what I was expecting... >> >> create view rrop08.rrop_01_13_innerbuffer AS >> >> SELECT ST_Difference(a.st_buffer, b.the_geom) >> >> FROM rrop08.rrop_01_13_buffer a, rrop08.rrop_01_f b; >> >> >> rrop08.rrop_01_f = the original polyon >> >> rrop08.rrop_01_13_buffer = the inner buffer >> >> >> >> >> >> _______________________________________________ >> postgis-users mailing list >> postgis-users@postgis.refractions.net >> http://postgis.refractions.net/mailman/listinfo/postgis-users >> > > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
