proximity_hash 2.0.0 proximity_hash: ^2.0.0 copied to clipboard
Generate a set of geohashes that cover a circular area, given the center coordinates and the radius
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 #
Based on proximityhash