intersection return empty
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- Dominant language
- C++
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Description
Why I do intersection with wagyu return 'MULTIPOLYGON EMPTY',but do intersection with GEOS return a geometry object?
e.g.
select st_astext(st_intersection(ST_GeomFromText('POLYGON((2600140.901 -603782.437400002, 2600545.2722 -603782.437400002, 2600545.2722 -603279.563999999, 2600140.901 -603279.563999999, 2600140.901 -603782.437400002))', 3857), ST_GeomFromText('POLYGON((2600245.2722 -603682.437400002,2600245.2722 -603682.437400002,2600244.66725 -603682.174225002,2600244.0623 -603681.911050001,2600243.45735 -603681.647875001,2600242.8524 -603681.3847,2600242.8524 -603681.3847,2600242.8524 -603681.3847,2600242.8524 -603681.3847,2600242.61455 -603680.929525,2600242.3767 -603680.47435,2600242.13885 -603680.019175,2600241.901 -603679.563999999,2600241.901 -603679.563999999,2600241.901 -603679.563999999,2600241.901 -603679.563999999,2600242.7438 -603680.28235,2600243.5866 -603681.000700001,2600244.4294 -603681.719050001,2600245.2722 -603682.437400002,2600245.2722 -603682.437400002))', 3857)));
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the supplied ST_Intersection query using the two WKT polygons and SRID 3857, then compare the Wagyu and GEOS results. Trace the intersection behavior in the Wagyu integration and use the observed geometry outputs to determine why Wagyu returns MULTIPOLYGON EMPTY while GEOS returns a geometry object.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, sql
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100