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.
First read the documentation at tile-reduce.
tile-reduce-py allows you to write the map script in Python. The reducer is
still Javascript. These examples require a modification to tile-reduce (see: mapbox/tile-reduce#68)
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
tile = mapbox_vector_tile.decode(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:
- An additional argument
workerCommandis set to 'python' - The
mapargument is now the path to the Python map script
'use strict';
var tileReduce = require('tile-reduce');
var path = require('path');
var numFeatures = 0;
tileReduce({
bbox: [-122.05862045288086, 36.93768132842635, -121.97296142578124, 37.00378647456494],
zoom: 15,
map: path.join(__dirname, '/count.py'), // Calling python script
workerCommand: 'python',
sources: [{name: 'osm', mbtiles: path.join(__dirname, '../../tests/fixtures/osm.mbtiles'), raw: true}]
})
.on('reduce', function(num) {
numFeatures += num;
})
.on('end', function() {
console.log('Features total: %d', numFeatures);
});