Description

In the below link, I found that $near 2d legacy use radians as distance measure.

https://docs.mongodb.com/manual/reference/operator/query/near/

{ $near: [ <x>, <y> ], $maxDistance: <distance in radians> }

However, when I tested queries in the mongo shell, I got confused because it seems like $near 2d legacy use degrees as distance measure.

1. use degrees

db.restaurants.find({ 'address.coord' :

{ $near : [ -73.9, 40.7 ], $maxDistance : 2/111.1 }

} ) #degrees

2. use radians

db.restaurants.find({ 'address.coord' :

{ $near : [ -73.9, 40.7 ], $maxDistance : 2/6378.1 }

} ) #radians

I checked that the first query with degrees gave correct answer, not the second one with radians.

Is there anyone who can solve my problem?

 

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