I am not able to create this "inside puffer with transparent hole "sld using
difference as this needs two separate input geometries in order to create the
buffer.
I wanted to do this with just one polyon geometry.
yours,
Rob
________________________________
Von: Robert Buckley <[email protected]>
An: "[email protected]"
<[email protected]>
Gesendet: 11:50 Dienstag, 21.Februar 2012
Betreff: Re: [Geoserver-users] SLD: inside Puffer
Hi,
sorry.. buffer = "puffer in german.
Thanks for the advice...ill give it a try
yours,
Rob
________________________________
Von: Andrea Aime <[email protected]>
An: Robert Buckley <[email protected]>
Cc: "[email protected]"
<[email protected]>
Gesendet: 10:52 Dienstag, 21.Februar 2012
Betreff: Re: [Geoserver-users] SLD: inside Puffer
On Mon, Feb 20, 2012 at 1:38 PM, Robert Buckley <[email protected]>
wrote:
Hi,
>
>
>I have tested the inside puffer capability of the geometry filter function and
>find it great. There is one detail though that I can´t create.
Puffer? You mean buffer?
Puffer does not seem to apply to GIS: http://en.wikipedia.org/wiki/Puffer
>
>I have a polyon which needs to be symbolized with an inner ring of 3.5mm at
>1:50,000. This can be done with the filterfunction. The problem is that the
>the middle of the polygon ie the area inside the polygon past the puffer must
>be fully transparent .In effect this is a hole in the middle.
>
>
>The filterfunction can indeed create a puffer, but the center of the polygon
>will always be filled.
So you're trying with a negative buffer, but that just shrinks the polygon,
while you want to extract some sort of border
instead?
I never tried myself, but I believe you can combine two filter functions,
buffer and difference, to get what you
want. Something like: difference(geom, buffer(geom, negativeDistance)) might
work.
Cheers
Andrea
--
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Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
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Italy
phone: +39 0584 962313
fax: +39 0584 962313
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