Ok, got it. Guess I mis-represented what WGS84 in my earlier post. What I should have said is that in RethinkDB we only mean a specific reference ellipsoid for

Ok, got it. Guess I mis-represented what WGS84 in my earlier post. What I should have said is that in RethinkDB we only mean a specific reference ellipsoid for computing distances between latitude/longitude coordinate pairs when referring to WGS84. If you have data in other projections you will definitely have to convert it first. On a side-note, in case it's of any help: There is a currently undocumented feature that allows you to specify an oblate reference ellispoid other than the one from WGS 84 in ReQL. The way you do that is by passing an object `{a: ..., f: ...}` to the `geo_system` optional argument. The value of 'a' must be the major radius of the ellipsoid in meters, and 'f' must be the flattening of the ellipsoid. This feature is not heavily tested though and should be used with caution.