tilereduce

tilereduce

A framework for writing tile-reduce map scripts in Python.

NOTE: This library is experimental and under active development. No official release has been created.

Usage

First read the documentation at tile-reduce.

tile-reduce-py allows you to write the map script in Python. The reducer is still Javascript.

import mapbox_vector_tile

import tilereduce


class BuildingRoadCount(tilereduce.TR):
    def mapper(self, x, y, zoom, data):
        if data is None:
            return 0

        # Decode the raw binary protocol buffer data
        td = mapbox_vector_tile.decoder.TileData(2048)
        tile = td.getMessage(data)

        count = 0
        if tile.get('buildings'):
            count += len(tile['buildings'])
        if tile.get('roads'):
            count += len(tile['roads'])

        return count


if __name__ == '__main__':
    BuildingRoadCount.main()

The reduce script is identical as the original Node example except the map argument is now the path to the Python map script.