Grainstore
Need to simply generate a Mapnik map from a dynamic PostGIS table?
Grainstore is an opinionated Carto MML style store for PostGIS tables, views or sql queries that outputs Mapnik XML stylesheets.
Map styles can be defined in the Carto map styling language or use default styles. The Carto styles are persisted and Mapnik XML output cached in Redis, making it a good choice for use in map tile servers.
The generated Mapnik XML stylesheet plugs directly into Mapnik or Mapnik based tile server to render a map and interactivity layer.
Grainstore is braindead simple:
1 db + 1 table/query + 1 style = 1 Mapnik XML stylesheet.
or
1 db + N queries + N styles = 1 Mapnik XML stylesheet.
Typical use
For using multiple layers use an array type for the 'sql' parameter and for the 'style' parameter. Each resulting layer will be named 'layerN' with N starting from 0 (needed to properly reference the layers from the 'style' values).
Install
npm install
Dependencies
- node.js >=6
- npm
Additional test dependencies
- libxml2
- libxml2-devel
Examples
var grainstore = ; var params = dbname: 'my_database' sql:'select * from my_table' style: '#my_table { polygon-fill: #fff; }' // fully default.var mmls = ;var mmlb = mmls;mmlb; // custom pg settings.var mmls = ; // see mml_store.js for more customisation detail var options = map: srid: 4326 datasource: user: "postgres" geometry_field: "my_geom" mmlb = mmls;mmlb;
For more examples, see the tests.
Tests
To run the tests, from the project root:
npm test
Release
npm publish
Contributing
See CONTRIBUTING.md.