Geography

Problem:

When you running your python script, you see an error message like

Traceback (most recent call last):
  File "run.py", line 2, in <module>
    import osmium as osm
ModuleNotFoundError: No module named 'osmium

Solution:

Install pyosmium using

pip install osmium

or

pip3 install osmium

This minimal example uses the osmium python binding to read an .osm.pbf file and count the number of nodes, ways and relations.

First, we need to download a suitable dataset. For this example, we’ll be using kenya-latest.osm.pbf which you can download from Geofabrik:

wget https://download.geofabrik.de/africa/kenya-latest.osm.pbf

Now we can run the script:

#!/usr/bin/env python3
import osmium as osm

class OSMHandler(osm.SimpleHandler):
    def __init__(self):
        osm.SimpleHandler.__init__(self)
        self.node_count = 0
        self.way_count = 0
        self.relation_count = 0

    def node(self, n):
        self.node_count += 1

    def way(self, w):
        self.way_count += 1

    def relation(self, r):
        self.relation_count += 1

osmhandler = OSMHandler()
osmhandler.apply_file("kenya-latest.osm.pbf")
print(f'Number of nodes: {osmhandler.node_count}')
print(f'Number of way: {osmhandler.way_count}')
print(f'Number of relations: {osmhandler.relation_count}')

Example output:

Number of nodes: 29442019
Number of way: 3188550
Number of relations: 2225