[geos-devel] Buffering with obstacles

Paul Ramsey pramsey at cleverelephant.ca
Wed Oct 11 15:55:35 PDT 2023

Feels like a raster problem… each cell in your picture is a fixed distance from the starting cell.

> On Oct 11, 2023, at 3:49 PM, Nyall Dawson via geos-devel <geos-devel at lists.osgeo.org> wrote:
> Hi list!
> (Apologies in advance for the embedded image, I couldn't write this
> post sensibly without it).
> I had a novel request this week for calculation of buffers which
> respect obstacle geometries. Given input features (the red dot below,
> but could also be line/polygon features), and a layer of "obstacles"
> (the blue line, but could be either lines or polygons), then the
> buffer must respect the obstacles and not be allowed to cross over the
> blue line. Ie the desired result is the red shaded area in the
> attached image.
> Every point in the buffer should be within the buffer distance of the
> original geometry by paths which don't cross any of the obstacle
> features.
> There's some prior related discussion at
> https://gis.stackexchange.com/questions/390958/buffering-with-obstacles
> Is this something which could potentially belong in JTS / GEOS? Is it
> even possible? And if so, is it something my customer could fund the
> development of?
> Cheers,
> Nyall
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