geohashtree 1.0.2

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GeohashTree is a tree implimentation to speed up spacial queries through geohash indexing.

GeohashTree #

Dart GeohashTree #

Pub Version Master

GeohashTree is a tree implimentation to speed up spacial queries through geohash indexing. This is useful for dynamically querying small selections of locations in a certain radius for example to display in a map as the user scrolls. The GeohashTree can have a variable depth with the default set at 9. This corresponds to a geohash of precision or length 9.

Install #

To get this plugin, add geohashtree as a dependency in your pubspec.yaml file. For example:

dependencies:
  geohashtree: ^1.0.2

Usage #

It is possible to add spatial based values to the tree with a geohash or directly with lat lng coordinates.

import 'package:geohashtree/geohashtree.dart';

GeohashTree<String> tree = GeohashTree<String>(); 
tree.add("6g3mc", "iguazu"); 
tree.addLatLng(-25.686667, -54.444722, "also iguazu");

To get all the coordinates in a tree within a radius of 5000 meters from the point 25.6953° S, 54.4367° W use getGeohashesByProximity(). The precision parameter dictates how specific the geohash match should be. Precision 5 return matches of geohash of length 5, which in this case would be all geohashes that start with "6g3mc". Precision 1 return matches of geohash of length 1, which in this case would be all geohashes that start with "6".

List<String> values = tree.getGeohashesByProximity(-25.686667, -54.444722,5000, precision: 9);

Issues #

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.

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GeohashTree is a tree implimentation to speed up spacial queries through geohash indexing.

Repository (GitHub)
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Documentation

API reference

Uploader

austen.novis@gmail.com

License

Apache 2.0 (LICENSE)

Dependencies

dart_geohash, proximity_hash

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Packages that depend on geohashtree