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@turf/kinks and @turf/unkink-polygon

See original GitHub issue

The kinks package detects self-intersection in the following shape: https://gist.github.com/polizz/53bfb5d8cd0e7cac09ae6543e1c89528. When I run the shape through unkink-polygon, I get the same shape back out. Not sure what is wrong here. The unkink-polygon function does work on other self-intersecting polygons. Let me know if I can provide more information.

export function removeDuplicatesAndFormatGeoJson(wkt) {
  try {
    let cleanGeom = clean(parse(wkt));
    const hasKinks = get(kinks(cleanGeom), 'features[0].geometry', false);

    if (hasKinks) {
      const unkinked = unkink(cleanGeom);
...

Issue Analytics

State:
Created 6 years ago
Comments:9 (7 by maintainers)

Top GitHub Comments

1reaction

barnabas-avalaracommented, Oct 3, 2018

Hi @DenisCarriere. I had to re-implement kink and unkinkPolygon functions in my own project because of this issue. It’s ES6 and a little brute-force but it does the job. Cheers!

https://gist.github.com/barnabas-avalara/2a9d9be5edd84fe2da8e769a9a9c509e

0reactions

DenisCarrierecommented, Jan 9, 2018

👍 @rowanwins Agreed, having both modules align would be the best approach using geojson-polygon-self-intersections, unfortunately that’s not a quick fix and would require some serious effort in making that modification.