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A URL to a GeoJSON file, or inline GeoJSON.
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Maximum zoom level at which to create vector tiles (higher means greater detail at high zoom levels).
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Contains an attribution to be displayed when the map is shown to a user.
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Size of the tile buffer on each side. A value of 0 produces no buffer. A value of 512 produces a buffer as wide as the tile itself. Larger values produce fewer rendering artifacts near tile edges and slower performance.
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Douglas-Peucker simplification tolerance (higher means simpler geometries and faster performance).
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If the data is a collection of point features, setting this to true clusters the points by radius into groups. Cluster groups become new
Point
features in the source with additional properties:cluster
Istrue
if the point is a clustercluster_id
A unqiue id for the cluster to be used in conjunction with the cluster inspection methodspoint_count
Number of original points grouped into this clusterpoint_count_abbreviated
An abbreviated point count
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Radius of each cluster if clustering is enabled. A value of 512 indicates a radius equal to the width of a tile.
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Max zoom on which to cluster points if clustering is enabled. Defaults to one zoom less than maxzoom (so that last zoom features are not clustered). Clusters are re-evaluated at integer zoom levels so setting clusterMaxZoom to 14 means the clusters will be displayed until z15.
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An object defining custom properties on the generated clusters if clustering is enabled, aggregating values from clustered points. Has the form
{"property_name": [operator, map_expression]}
.operator
is any expression function that accepts at least 2 operands (e.g."+"
or"max"
) — it accumulates the property value from clusters/points the cluster contains;map_expression
produces the value of a single point.Example:
{"sum": ["+", ["get", "scalerank"]]}
.For more advanced use cases, in place of
operator
, you can use a custom reduce expression that references a special["accumulated"]
value, e.g.:{"sum": [["+", ["accumulated"], ["get", "sum"]], ["get", "scalerank"]]}
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Whether to calculate line distance metrics. This is required for line layers that specify
line-gradient
values. -
Whether to generate ids for the geojson features. When enabled, the
feature.id
property will be auto assigned based on its index in thefeatures
array, over-writing any previous values. -
A property to use as a feature id (for feature state). Either a property name, or an object of the form
{<sourceLayer>: <propertyName>}
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When loading a map, if PrefetchZoomDelta is set to any number greater than 0, the map will first request a tile at zoom level lower than zoom - delta, but so that the zoom level is multiple of delta, in an attempt to display a full map at lower resolution as quick as possible. It will get clamped at the tile source minimum zoom. The default delta is 4.
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