Hi,
Geo-Spatial Queries are already part of Mongo: https://docs.mongodb.com/manual/reference/operator/query-geospatial/ and some examples here: https://docs.mongodb.com/manual/reference/operator/query/nearSphere/
You would use them with the find method: http://docs.coroniumcore.com/server/modules/mongo/#find
I’ll see if I can write up a little example as soon as I have a minute.
-dev