pyhgtmap failing with one specific poly file with multipolygon and datasource sonn1 about pyhgtmap HOT 3 CLOSED

Hi, and happy new year!
I've been able to reproduce. It's actually a specific tile of sonn1 (no issue with sonn3):
python ../../pyhgtmap/main.py --pbf --source=sonn1 --polygon=Freizeitkarte_GBR+.poly --log=DEBUG hgt/SONN1/N49E000.hgt

I guess it's linked to computed intersections of the polygon(s) and the tile bounding box.

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This is actually not because the input is a multi-polygon, but because the intersection of the first polygon (in red, right part) with the tile bounding box (in blue) is a heterogeneous collection of polygon and line (in orange below) :

Green is the result after fixing the function.

NB: never noticed the bounding box of Great Britain looked like a rabbit :D

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Many thanks for fixing it.

Just tested it with the same setup as last time, just new pyhgtmap version and it works like a charm.

Cheers Patrik

BTW: rabbit ? that's true..... Switzerland (where I'm from) looks a bit like a wild boar :D

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