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Simplify polygons

arno

arno

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The features that are generated using the detect features step of scenProc are not simplified. Before these polygons would be a bit blocky because of the raster image that has been converted into the polygon. But with the simplification a more smooth polygon results. In the image below you can see an example without (left) and with (right) the simplification applied.

The simplification makes the polygons less complex and therefore also reduces the size of the AGN files. And with this simplification it also becomes possible to use the feature detect polygons for buildings. For the blocky polygons it was not possible to calculate the best fitting rectangle correctly, but for the simplified ones that no longer applies.

simplify.png


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Hi Arno, just wondering if this has been implemented yet in the developers release as yet or if it's still in the coding process? ;)
 
Hi Dean,

Yes, this thread is from the blog post where I announced that this feature was included. It's automatically used in the DETECTFEATURES step. There is no manual step to do the simplification now, I might be able to add that in the future.
 
Ah ok, thanks Arno. I was wondering if I could run the process over some .shp files I have that basically look like the example on the left and I'd love to reduce both the vertex count and smooth out the polygon. You gave me another idea though that might help me take a different approach :)
 
Hi Dean,

You can use the same logic on the command prompt with ogr2ogr as well (-simplify option). I use the OGR library for it.
 
Oh awesome, I'll give that a shot once I figure out this Windows Server 2012 R2 spb2xml error I'm getting
 
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