Yes I think you got it right! I don't know how to use python very well, so I'd appreciate some code to work off of. No rush though!
On Mon, Jan 18, 2021 at 2:00 PM <qgis-u...@stripfamily.net> wrote: > If I understand correctly, your problem is that the layer you are > buffering has multiple polygons and the buffer around polygon 1 might > intersect polygon2, so if you buffer the layer, then difference the layer > from the buffer, you lose these overlaps. What you want is to difference > buffer 1 with polygon 1, buffer 2 with polygon 2, etc. > > I am not aware of a way to do that from the GUI, but it's only a couple of > line in PyQgis. You need to loop over the features of the buffer layer, > differencing the corresponding polygon from the original layer. In my quick > test, the FID is preserved across the two layers. The feature order appears > to be the same, but it would be prudent to sort the two lists of features > first to be sure of the same order. Then it's just a matter of looping over > the features and calling the difference method on the two geometries and > adding the result to your new layer. > > If nobody comes up with a better method or code and you don't know how to > write Python, I'll probably have a bit of time later today to bang this out. >
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