tegola-bathymetry

Rendering a GEBCO gridded bathymetric data set using Tegola.

This repo houses configuration files used to run a Tegola-based vector tile service for bathymetric data. We use it in combination with basic OpenStreetMap data rendering and specialized seamark-tagged data rendering. The goal here is to match NGA-style contour symbology as laid out in US Chart 1:

Repo files of interest

• bathymetry.toml - a Tegola configuration file
• .env-example - a skeleton for setting configuration and sensitive values via environment variables
• systemctl/bathymetry.service - we use this in production to start and stop the service

Setting database connections with environment variables

It can be desirable to use separate databases for a Tegola installation. For example, even though you may have OpenStreetMap data for multiple metro or Geofabrik extracts, you'll likely only need one copy of the OSM land polygons and Natural Earth Data.

Tegola v0.6.0 and higher supports the use of environment variables to configure cache and database connection information. Copy .env-example to .env and customize away. A Procfile is included for those who use tools that recognize it, such as foreman, clones such as node-foreman or Python's honcho, or the Heroku Command Line Interface which bundles it.

For use in development, you should be able to:

npm install foreman -g
nf start

For use in production, you may install systemctl/bathymetric.service into /lib/systemd/system/. Make sure all paths are correct for your installation, then use:

sudo systemctl start bathymetry

to start the service,

sudo systemctl stop bathymetry

to stop the service, and

sudo systemctl enable bathymetry

to start the service on system boot.