Hi, I admit that my test was somewhat lunatic but I took some random dataset from Finland with 68101 polygons and converted data into MVT with default settings which means that minzoom was 0. As a result 12196 of the source polygons were written into the 0-level protobuf tile (in EPSG:3067 gridset) and none of the polygons is valid. Most polygons have too few points and those which have enough points have self-intersections.
Perhaps there should be some sort of geometry validator in the writer chain? -Jukka Rahkonen-
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