How-to add a GeoJSON file
=========================

Getting a GeoJSON file
----------------------

GeoJSON files are stored statically! No MapServer is involved in the
serving or rendering of a GeoJSON file with GeoMoose.

A great example is the ``cities.geojson`` file. `It can be downloaded
from
here <https://github.com/mahemoff/geodata/raw/master/cities.geojson>`__
and placed in the the ``workshop/`` directory.

Add the new map-source
----------------------

In ``mapbook.xml`` after line 5 add:

.. raw:: html

   <!-- {% raw %} -->

::

    <map-source name="cities" type="geojson">
        <url>./cities.geojson</url>
        <layer name="all-cities">
            <style><![CDATA[
            {
                "circle-radius" : 5,
                "circle-color": "blue",
                "text-font": ["Arial", "Open Sans Regular"],
                "text-field": "{city}",
                "text-jusitfy": "right",
                "text-anchor": "right"
            }
            ]]></style>
        </layer>
    </map-source>

.. raw:: html

   <!-- {% endraw %} -->

Add cities to the catalog
-------------------------

-  Find ``<catalog>`` in the mapbook.
-  After the ``<catalog>`` tag add:

   .. code:: xml

       <layer src="cities/all-cities" title="World Cities" />

Important notes on GeoJSON layers
---------------------------------

1. They cannot yet be used for querying.
2. They are styled using a subset of `MapBox GL
   Styles <https://www.mapbox.com/mapbox-gl-js/style-spec/>`__.

The package used by GeoMoose to translate the MapBox GL styles to
OpenLayers styles is actively being updated and GeoMoose will follow its
progress.