Hi, With these polygons
POLYGON ((261 419, 400 380, 360 261, 242 260, 261 419)) POLYGON ((403 380, 545 349, 479 209, 361 259, 403 380)) POLYGON ((339 397, 369 465, 542 425, 490 358, 339 397)) topology plugin option Find coverage overlaps in layer creates layer Overlap size with two features. With OJ Version 20201222 snapshot rev.6656 the length attribute values are 0.11195423340878746 2.9378493119766333 and the geometries are LINESTRING ( 339.0451892299002 397.10242892110716, 339 397 ) LINESTRING ( 490.62660355029584 360.87024852071005, 490 358 ) With OJ2 from yesterday the length values are zero and the geometries are LINESTRING ( 0 0, 0 0). The Overlap segments and Overlaps layers seem to be OK. Java 8 and Java 11 yield similar results. -Jukka Rahkonen-
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