Dart Proximity Hash
Proximity Hash generates a set of geohashes that cover a circular area, given the center coordinates and the radius. Geohash is a public domain geocode system which encodes a geographic location into a short string of letters and digits and is used as unique identifies and to represent point data in databases.
For example the point
25.6953° S, 54.4367° W
will covert to
Proximity hash also comes with a geohash library forked from dart_geohash since it was not being actively maintained.
To get this plugin, add
proximity_hash as a dependency in your pubspec.yaml file. For example:
dependencies: proximity_hash: ^1.1.0
To get all the geohashes within a radius of
5000 meters from the point
25.6953° S, 54.4367° W with precision
3 simply import the library and call
createGeohashes(). The precision dictates how long and how many geohashes are returned. For
example a precision of 3 returns geohahses of length 3.
import 'package:proximity_hash/proximity_hash.dart'; List<String> proximityGeohashes = createGeohashes(48.864716, 2.349014, 5000, 3); // proximityGeohashes == ["u0d","u09"]
createGeohashes for different precisions with radius
1000. Performance can become limiting starting at precision 9. Note that a larger radius will also decrease performance.
Please file any issues, bugs or feature requests as an issue on our GitHub page.
Want to Contribute
If you would like to contribute to the plugin (e.g. by improving the documentation, solving a bug or adding a cool new feature) submit a pull request.
Want to Support
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