$center
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Definition
-
$center
-
The
$center
operator specifies a circle for a$geoWithin
query. The query returns legacy coordinate pairs that are within the bounds of the circle. The operator does not return GeoJSON objects.To use the
$center
operator, specify an array that contains:- The grid coordinates of the circle’s center point, and
- The circle’s radius, as measured in the units used by the coordinate system.
Important
If you use longitude and latitude, specify longitude first.
Behavior
The query calculates distances using flat (planar) geometry.
Applications can use $center
without having a geospatial index. However, geospatial indexes support much faster queries than the unindexed equivalents.