Re: [jts-dev] complete overlay with labels

[Thomas Leduc <thomas.leduc.44@xxxxxxxxx>]

Dear Michaël,

A few years ago, in response to a question about multiple overlays, Martin Davies proposed to proceed by polygonization. Adapting the idea, I suggest the following procedure:
  - extract the contours and proceed to their geometrical union,
  - polygonize this set of contours,
  - for each centroid of the shapes resulting from this polygonization, identify the polygon or polygons of the starting set which contains it.
Have a nice day.

Thomas Leduc

On Thu, Sep 23, 2021 at 9:13 AM Michaud Michael <m.michael.michaud@xxxxxxxxx> wrote:

Hi JTS developpers,

I'm searching for the best approach to overlay 2 geometries A and B and label each resulting polygon
with A, B or A+B.
With Polygonizer, I can get all resulting polygons, but I need to add intersection tests with original
geometries to get the labels
Another approach is with OverlayNG, but all operations (intersection, union, A-B, B-A and symmetric difference) give me a partial result
and I did not find a way to avoid several ovelay computations to get the full result.

Thank you for your ideas,

Michaël

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Thomas LEDUC