druid/docs/Spatial-Indexing.md

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Note: This feature is highly experimental.

In any of the data specs, there is now the option of providing spatial dimensions. For example, for a JSON data spec, spatial dimensions can be specified as follows:

<code>
{
    "type": "JSON",
    "dimensions": <some_dims>,
    "spatialDimensions": [
        {
            "dimName": "coordinates",
            "dims": ["lat", "long"]
        },
        ...
    ]
}
</code>

property	description	required?
dimName	The name of the spatial dimension. A spatial dimension may be constructed from multiple other dimensions or it may already exist as part of an event. If a spatial dimension already exists, it must be an array of dimension values.	yes
dims	A list of dimension names that comprise a spatial dimension.	no