Redis Geo commands are mainly intended to solve the specific problem of indexing points into the earth and querying by radius. In this setup, the error we have

Redis Geo commands are mainly intended to solve the specific problem of indexing points into the earth and querying by radius. In this setup, the error we have currently is around 0.5% because Earth is not actually a sphere, but the good news is that fixing it should be just a very simple matter of using a more accurate distance formula: http://www.movable-type.co.uk/scripts/latlong-vincenty.html http://www.movable-type.co.uk/scripts/latlong-vincenty.html Since anyway the bounding boxes we calculate and the resulting areas we scan are larger than needed, so all the actual precision is in the filtering function that removes points outside the radius. TLDR: It will be trivial to fix that later in a backward compatible way. Btw adding an item in my TODO in order to check if I can do it right now without compromising performances.