Compute Road Coverage in OpenStreetMap

A TileReduce processor for calculating OpenStreetMap mileage by country using OSM QA Tiles.

See How Complete is OpenStreetMap?.

# Usage in short (more command options below)
npm install
node download.js --all
node index.js > output.json

Installation

npm install

Downloading data

osm-coverage requires two data sources

• Country boundaries
• OSM QA Tiles

All sources

Both sources can be conveniently downloaded using the download.js script in this repo.

node download.js --all

Only country boundaries

node download.js --countries

This will automatically download and convert the Natural Earth 10m Countries dataset.

osm qa tiles

OSM QA tiles are very large - about 18 GB.

node download.js --osm

If you wish to download QA tiles yourself:

• Download OSM QA tiles
• Use gunzip or any other archiving tool that can expand .gz files to expand OSM QA tiles

Running

When executing the TileReduce task, you may provide a bounding box to select tiles. For example:

node index.js --area=[-77.12,38.79,-76.9,39] > output.json

If no bounding box is provided, osm-coverage will run for the whole world.