OpenRoads Vietnam Tiler

A set of "worker" processes to support the OpenRoads website (repo orma/openroads-vn-analytics), drawing on the OpenRoads database.

Generates raster tiles from an OSM-API-v0.6-compatible database and pushes these tiles to a remote host. Additionally, runs geospatial processes and statistics, creating:

• vector tiles, that have field-data road properties conflated onto the OSM geometries
• routable dumps of the road geometries, with some properties attached, by admin area
• for each road ID in the OSM geometries, calculation of road length and summary statistics for roughness, which get applied back to the database for display on the front-end
• generation of "tasks" where potential duplicate geometries are detected, or potential intersections
• a backup of the database's key tables

Running locally

Requirements

• psql
• tippecanoe
• node v6
• yarn
• geojson-stream-merge

Environment variables

The necessary environment variables are listed in the cron.sh file. Set these in a .env file when running locally.

Setup and execution

yarn install
yarn start

To run particular processes/calculations in the scripts folder, first get a dump of production data using the scripts/*.sql commands (eg, cd scripts; psql -d ${DATABASE_URL} -f ways.sql;), then execute one of the scripts.

Deployment

The worker tasks will be executed on a regular basis, as dictated in the cron.sh file, and all code will be packaged using the Dockerfile. To deploy to production, simply increment the version in package.json, push to master, and then update the version in the AWS configuration in the orma/openroads-vn-api repo accordingly (https://github.com/orma/openroads-vn-api/blob/develop/aws/app/config.yml).

License

MIT