polygon-geohasher

polygon-geohasher

Polygon Geohasher is a Open source Python package which converts a polygon into a set of geohashes with arbitrary precision. More conversely, it can obtain the set of geohashes inside a polygon or geohashes that touch (intersects) the polygon. This library uses python-geohash and shapely.

Requirements

Polygon Geohasher requires:

• Python >= 3.x.
• GEOS >= 3.3 (due to shapely).

Installing

Linux users can get Polygon Geohasher from the Python Package Index with pip (8+):

todo $ pip install polygon-geohasher

Usage

Here are some simple examples:

from shapely import geometry

polygon = geometry.Polygon([(-99.1795917, 19.432134), (-99.1656847, 19.429034),
                            (-99.1776492, 19.414236), (-99.1795917, 19.432134)])
inner_geohashes_polygon = geohashes_to_polygon(polygon_to_geohashes(test_polygon, 7))
outer_geohashes_polygon = geohashes_to_polygon(polygon_to_geohashes(test_polygon, 7, False))

geohash_to_polygon(geohash):

This function receives a geohash, and returns a Shapely's Polygon.

geohashes_to_polygon(geohashes):

This function receives a set of geohashes, and returns a Shapely's Polygon or MultiPolygon.

polygon_to_geohashes(polygon, precision, inner(optional)):

This function receives a Shapely's Polygon, the precision of geohashes that will be used to create a polygon and returns a set of geohashes (strings) which covers the polygon. It also receives an optional parameter inner that defines the way how those polygons will be created. If inner only contained geohashes will be used, otherwise intersected will.

For instance you can see resulted geohashed polygons with both options.

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