https://mongodb.github.io/mongo-csharp-driver/2.3/apidocs/html/M_MongoDB_Driver_GeoNearPoint_op_Implicit_2.htm
GeoNearPoint Implicit Conversion (GeoJsonPoint(GeoJson2DProjectedCoordinates) to GeoNearPoint)
Implicit conversion to wrap a 2D GeoJson point in a GeoNearPoint value.
implicit conversion
https://mongodb.github.io/mongo-csharp-driver/2.10/apidocs/html/Properties_T_MongoDB_Driver_GeoJsonObjectModel_GeoJson2DProjectedCoordinates.htm
GeoJson2DProjectedCoordinates Properties
properties
https://mongodb.github.io/mongo-csharp-driver/2.10/apidocs/html/P_MongoDB_Driver_GeoJsonObjectModel_GeoJson2DProjectedCoordinates_Northing.htm
GeoJson2DProjectedCoordinates.Northing Property
property