Kosmtik

Very lite but extendable mapping framework to create Mapnik ready maps with OpenStreetMap data (and more).

For now, only Carto based projects are supported (with .mml or .yml config), but in the future we hope to plug in MapCSS too.

Alpha version, installable only from source

Lite

Only the core needs:

• project loading
• local configuration management
• tiles server for live feedback when coding
• exports to common formats (Mapnik XML, PNG…)
• hooks everywhere to make easy to extend it with plugins

Screenshot

Install

Clone this repository with git clone https://github.com/kosmtik/kosmtik.git, go to the downloaded directory with cd kosmtik, and run:

npm install

Update

Obtain changes from repository (e.g. git pull)

rm -rf node_modules && npm install

To reinstall all plugins:

node index.js plugins --reinstall

Usage

To get command line help, run:

node index.js -h

To run a Carto project (or .yml, .yaml):

node index.js serve <path/to/your/project.mml>

Then open your browser at http://127.0.0.1:6789/.

You may also want to install plugins. To see the list of available ones, type:

node index.js plugins --available

And then pick one and install it like this:

node index.js plugins --install pluginname

For example:

node index.js plugins --install kosmtik-map-compare [--install kosmtik-overlay…]

Local config

Because you often need to change the project config to match your local env, for example to adapt the database connection credentials, kosmtik comes with an internal plugin to manage that. You have two options: with a json file named localconfig.json, or with a js module name localconfig.js.

Place your localconfig.js or localconfig.json file in the same directory as your carto project (or .yml, .yaml).

In both cases, the behaviour is the same, you create some rules to target the configuration and changes the values. Those rules are started by the keyword where, and you define which changes to apply using then keyword. You can also filter the targeted objects by using the if clause. See the examples below to get it working right now.

Example of a json file

[
    {
        "where": "center",
        "then": [29.9377, -3.4216, 9]
    },
    {
        "where": "Layer",
        "if": {
            "Datasource.type": "postgis"
        },
        "then": {
            "Datasource.dbname": "burundi",
            "Datasource.password": "",
            "Datasource.user": "ybon",
            "Datasource.host": ""
        }
    },
    {
        "where": "Layer",
        "if": {
            "id": "hillshade"
        },
        "then": {
            "Datasource.file": "/home/ybon/Code/maps/hdm/DEM/data/hillshade.vrt"
        }
    }
]

Example of a js module

exports.LocalConfig = function (localizer, project) {
    localizer.where('center').then([29.9377, -3.4216, 9]);
    localizer.where('Layer').if({'Datasource.type': 'postgis'}).then({
        "Datasource.dbname": "burundi",
        "Datasource.password": "",
        "Datasource.user": "ybon",
        "Datasource.host": ""
    });
    // You can also do it in pure JS
    project.mml.bounds = [1, 2, 3, 4];
};

Custom renderers

By default Kosmtik uses Carto to render the style. Via plugins it is possible to use other renderers or Carto implementations. You can switch the renderer installing the appropriate plugin and by passing the command line option --renderer NAME. NAME refers to the renderer name (e.g. carto for the default renderer or magnacarto for the Magnacarto renderer).

Known plugins

• kosmtik-overpass-layer: add Overpass Layer in your carto project
• kosmtik-fetch-remote: automagically fetch remote files in your layers
• kosmtik-place-search: search places control
• kosmtik-overlay: add an overlay above the map
• kosmtik-open-in-josm: open JOSM with current view
• kosmtik-map-compare: display a map side-by-side with your work
• kosmtik-osm-data-overlay: display OSM data on top of your map
• kosmtik-tiles-export: export a tiles tree from your project
• kosmtik-mbtiles-export: export your project in MBTiles
• kosmtik-magnacarto: Magnacarto renderer for CartoCSS

Run node index.js plugins --available to get an up to date list.