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turf-concave
Advanced tools
Takes a set of points and returns a concave hull polygon.
Internally, this uses turf-tin to generate geometries.
Parameters
points
FeatureCollection<Point> input pointsmaxEdge
number the size of an edge necessary for part of the
hull to become concave (in miles)units
string used for maxEdge distance (miles or kilometers)Examples
var points = {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [-63.601226, 44.642643]
}
}, {
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [-63.591442, 44.651436]
}
}, {
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [-63.580799, 44.648749]
}
}, {
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [-63.573589, 44.641788]
}
}, {
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [-63.587665, 44.64533]
}
}, {
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [-63.595218, 44.64765]
}
}
]
};
var hull = turf.concave(points, 1, 'miles');
var resultFeatures = points.features.concat(hull);
var result = {
"type": "FeatureCollection",
"features": resultFeatures
};
//=result
Returns Feature<Polygon> a concave hull
This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.
Install this module individually:
$ npm install turf-concave
Or install the Turf module that includes it as a function:
$ npm install turf
FAQs
turf concave module
We found that turf-concave demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 9 open source maintainers collaborating on the project.
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