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$geoWithin

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Definition

$geoWithin

New in version 2.4: $geoWithin replaces $within which is deprecated.

Selects documents with geospatial data that exists entirely within a specified shape. When determining inclusion, MongoDB considers the border of a shape to be part of the shape, subject to the precision of floating point numbers.

$geoWithin does not require a geospatial index. However, a geospatial index will improve query performance. Both 2dsphere and 2d geospatial indexes support $geoWithin.

The specified shape can be either a GeoJSON Polygon (either single-ringed or multi-ringed), a GeoJSON MultiPolygon, or a shape defined by legacy coordinate pairs.

To specify a GeoJSON Polygon (either single-ringed or multi-ringed) or MultiPolygon, $geoWithin uses the $geometry operator to specify the shape and has the following form:

{
   <location field>: {
      $geoWithin: {
         $geometry: {
            type: <"Polygon" or "MultiPolygon"> ,
            coordinates: [ <coordinates> ]
         }
      }
   }
}

Important

If you use longitude and latitude, specify coordinates in order of longitude, latitude.

If querying for inclusion in a shape defined by legacy coordinate pairs on a plane, use the following syntax:

{
   <location field>: {
      $geoWithin: { <shape operator>: <coordinates> }
   }
}

The available shape operators are:

Behavior

The $geoWithin operator does not return sorted results. As such, MongoDB can return $geoWithin queries more quickly than geospatial $near or $nearSphere queries, which sort results.

For $geoWithin queries, GeoJSON geometries must have an area less than the area of a single hemisphere. For geometries larger than a single hemisphere, MongoDB queries for the smaller of the complementary geometries. For geometries equal to a single hemisphere, MongoDB makes no guarantees as to which geometry (the specified geometry or the complementary) it uses.

Example

The following example selects all loc data that exist entirely within a GeoJSON Polygon:

db.places.find(
   {
     loc: {
       $geoWithin: {
          $geometry: {
             type : "Polygon" ,
             coordinates: [ [ [ 0, 0 ], [ 3, 6 ], [ 6, 1 ], [ 0, 0 ] ] ]
          }
       }
     }
   }
)
$within

Deprecated since version 2.4: $geoWithin replaces $within in MongoDB 2.4.