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LAYERS.md

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Layers

Add custom layer

To add a custom layer from an external source (e.g. vector, raster) you can use the mapengine's MapSource which employs MapLibre's Source.

In the following example, the WMS raster layer Flurstücke from ALKIS Brandenburg (WMS) is added.

Adjust the tile URL to your needs, see the WMS GetCapabilities (GetCapabilities for this example) for supported parameter values.

MAP_ENGINE_SOURCES = [
    setup.MapSource(
        name="bb_flurstuecke",
        type="raster",
        tiles=[
            "https://isk.geobasis-bb.de/ows/alkis_wms"
            "?bbox={bbox-epsg-3857}&format=image/png&service=WMS&version=1.3.0&request=GetMap&crs=EPSG:3857&"
            "styles&width=768&height=768&transparent=true&layers=adv_alkis_flurstuecke",
        ],
    ),
]

MAP_ENGINE_LAYERS = [
    setup.MapLayer(id="bb_flurstuecke", source="bb_flurstuecke", style={"type": "raster"}),
]

To add the layer to your legend, add the following to your legend definition:

legend.LegendLayer(
    _("Flurstücke"),
    _(
        "Flurstücke Brandenburg<br>"
        "© GeoBasis-DE/LGB, dl-de/by-2-0<br><br>"
        "<i>Diese Ebene wird erst bei hohen Zoomstufen eingeblendet.</i>",
    ),
    layer_id="bb_flurstuecke",
),

You will also need a style definition for the legend in your layer style json file (defined in the variable ``), e.g.

{
    "bb_flurstuecke": {
        "type": "fill",
        "paint": {
            "fill-color": "#000000",
            "fill-opacity": 0.8
        }
    }
}

On WMS see also:

Toggling layers

In your django project you can create inputs which get connected automatically connected to a layer in order to switch this layer on and off. To do so, you have to create an input of type "checkbox" with an id which is related to layer ID you want to trigger:

<input id="wind" type="checkbox">

Triggering (changing) this input will toggle all layers starting with "wind". This guarantees that also clustered layers (in this example "wind", "wind_cluster" and "wind_cluster_count") are triggered.