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|