Buffering sometimes drops non-contiguous shapes

[peterqliu]

running turf.buffer(fc, 0, 'miles') on this featurecollection

gives me this:

Removing the polygon to the far northeast seems to solve this problem; it's also the only poly with a hole, so that may have something to do with it.

cc/ @morganherlocker

[peterqliu]

Another example, this time without visible holes. Original:

turf.buffer(fc, 0, 'miles'):

[tcql]

@peterqliu this might be the same as #12. turf-buffer got some updates and is currently v1.0.4, but the main turf release is still only including v1.0.1

[sbma44]

I'm seeing the same behavior using v1.0.4 with quattroshapes' myanmar. confirmed the behavior in Mapbox Studio and QGIS:

studio is still chewing through the original myanmar geojson but here's the buffer -- you can see that features are missing

[sbma44]

wound up with this workaround. pretty slow but gets the job done:

var fs = require('fs');
var buffer = require('turf-buffer');
var merge = require('turf-merge');
var polygon = require('turf-polygon');
var featurecollection = require('turf-featurecollection');

var p = JSON.parse(fs.readFileSync('quattro-myanmar.geojson'));

var out = [];
p.geometry.coordinates.forEach(function(coords, i) {
     out.push(buffer(polygon(coords), 1000, 'meters'));
});

console.log(JSON.stringify(merge(featurecollection(out))));