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$Centersphere Operator In Mongodb

In this article, we will discuss the $centerSphere operator in MongoDB.

Purpose

The $centerSphere operator is used to find all the documents where the location falls within a certain distance from the specific points.

Consider the following image: -

Picture showing how the distance is measured from the radius in a sphere

In the above figure, we are checking all the locations that fall within the 10-mile radius of the center.

Syntax

{
  $geoWithin: {
    $centerSphere: [ [ <x>, <y> ], <radius> ]
  }
}

In the above syntax, x and y are the center coordinates. The radius is the distance from the center of the circle. The radius is calculated using the following formula.

Distance/6378.1

Here 6378.1 is the radius of the earth in kilometers.

Creating The 2Dsphere Index

The first step is to create a 2dsphere index.

db.locations.createIndex({ location: "2dsphere" });

Example

Consider the following collection: -

Picture showing the sample mongodb collection

To find all the locations within 4 kilometers of Pragati Maidan, we will use the following query: -

db.locations.find({
  location: {
    $geoWithin: {
      $centerSphere: [ [ 77.2441, 28.6189 ], 4 / 6378.1 ]
    }
  }
});

Output

Posted By -	Karan Gupta

Posted On -	Friday, May 31, 2024

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