$minDistance¶

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Definition
Examples

Definition¶

$minDistance¶

2.6 新版功能.

Filters the results of a geospatial $near or $nearSphere query to those documents that are at least the specified distance from the center point.

$minDistance is available for use with 2dsphere index only.

If $near or $nearSphere query specifies the center point as a GeoJSON point, specify the distance as a non-negative number in meters.

If $nearSphere query specifies the center point as legacy coordinate pair, specify the distance as a non-negative number in radians. $near can only use the 2dsphere index if the query specifies the center point as a GeoJSON point.

Examples¶

Use with `$near`¶

重要

Specify coordinates in this order: “longitude, latitude.”

Consider a collection places that has a 2dsphere index.

The following example returns documents that are at least 1000 meters from and at most 5000 meters from the specified GeoJSON point, sorted from nearest to farthest:

db.places.find(
   {
     location:
       { $near :
          {
            $geometry: { type: "Point",  coordinates: [ -73.9667, 40.78 ] },
            $minDistance: 1000,
            $maxDistance: 5000
          }
       }
   }
)

Use with `$nearSphere`¶

Consider a collection places that contains documents with a location field and has a 2dsphere index.

Then, the following example returns whose location is at least 1000 meters from and at most 5000 meters from the specified point, ordered from nearest to farthest:

db.places.find(
   {
     location: {
        $nearSphere: {
           $geometry: {
              type : "Point",
              coordinates : [ -73.9667, 40.78 ]
           },
           $minDistance: 1000,
           $maxDistance: 5000
        }
     }
   }
)

For an example that specifies the center point as legacy coordinate pair, see $nearSphere

← $geometry $maxDistance →