Closed andrewharvey closed 7 years ago
Internally this library is using union
from jsts
which outputs Polygon|MultiPolygon
, however the MultiPolygon output isn't get handled properly.
Solution: We could use flattenEach
from @turf/meta
to process the unioned outputs into simple polygons.
I am having the same issue here, I can try to fix and send a PR :)
That would be great thanks @thiagoxvo , sing out if you need a hand!
[x] GeoJSON data as a gist file or geojson.io (filename extension must be
.geojson
). http://geojson.io/#id=gist:anonymous/59a73beffdced0e4f7d2d12eb271d380&map=16/-36.8815/174.8318[x] Snippet of source code or for complex examples use jsfiddle. http://jsbin.com/joqeraloxe/edit?html,console,output
In the above data/example app, turf-mask fails with:
From what I could tell it's the
unionPolygons
step where it returns a MultiPolygon but the spec at https://github.com/Turfjs/turf/blob/master/packages/turf-mask/index.js#L137 says it should only return Polygon:@returns {FeatureCollection<Polygon>} polygons only apply union if they collide
I don't have the time to investigate further and I'll workaround this issue so it's not a critical issues.
/cc @rowanwins just flagging you as you did the original implementation.