Question

Here is a simplified version of my data:

> db.foo.insert({"name" : "jim",  "locations" : [[10,10],[3,6],[1,2]]})
> db.foo.insert({"name" : "john",  "locations" : [[1,5],[2,4]]})

I would like to be able to do things like

> db.foo.find( { locations : { $near : [5,5] } } )

Is there a way to create a geospatial index on an array? Doing:

> db.foo.ensureIndex({locations: "2d"}) 

gives the following error:

geo values have to be numbers: { 0: [ 1.0, 5.0 ], 1: [ 2.0, 4.0 ] }

Any advice or resources would be very much appreciated.

Answer 1

Currently, MongoDB’s Geospatial indexes only support 2 coordinate indexes; you can also have only one geospatial index per collection.

They must be either an array of two numeric values, or a document of two numeric values.

Array:

  [40.889248, -73.898583]

Document:

{ "lat" : 40.889248, "lon" : -73.898583 }