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Geographic Queries

Druid supports filtering specially spatially indexed columns based on an origin and a bound.

Spatial Indexing

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

"dataSpec" : {
    "format": "JSON",
    "dimensions": <some_dims>,
    "spatialDimensions": [
        {
            "dimName": "coordinates",
            "dims": ["lat", "long"]
        },
        ...
    ]
}

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 coordinate values.	yes
dims	A list of dimension names that comprise a spatial dimension.	no

Spatial Filters

The grammar for a spatial filter is as follows:

"filter" : {
    "type": "spatial",
    "dimension": "spatialDim",
    "bound": {
        "type": "rectangular",
        "minCoords": [10.0, 20.0],
        "maxCoords": [30.0, 40.0]
    }
}

Bounds

Rectangular

property	description	required?
minCoords	List of minimum dimension coordinates for coordinates [x, y, z, …]	yes
maxCoords	List of maximum dimension coordinates for coordinates [x, y, z, …]	yes

Radius

property	description	required?
coords	Origin coordinates in the form [x, y, z, …]	yes
radius	The float radius value	yes