which-polygon
Advanced tools
A simple index for matching points against a set of GeoJSON polygons to find what polygon a point belongs to.
For example, given a GeoJSON of world countries, it can be used to determine what country a location belongs to.
Using this 50m world countries dataset:
var geojson = require('./countries.json');
var tree = whichPolygon.index(geojson);
whichPolygon.query(tree, [30.5, 50.5]).admin; // 'Ukraine'
The input GeoJSON must be a feature collection of polygons or multipolygons.
Once the index is built, queries are pretty fast — 20 seconds to query 1 million random locations on a Macbook Pro in this particular case.
FAQs
Index for matching points against a set of GeoJSON polygons
The npm package which-polygon receives a total of 14,430 weekly downloads. As such, which-polygon popularity was classified as popular.
We found that which-polygon demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 28 open source maintainers collaborating on the project.
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