title: How to perform the Search operation using Google S2 geometry
body: <p>I have geo location of vehicles and my point in the city and I need to find those vehicles that are within 5kms radius of my point.
  I could represent the vehicle locations and my point with S2 cell id. But how can i query ?</p>
  
  <p>can I store data for all the users in a database and make query on S2 cell ids.
  As S2 cell id is using Hilbert curve, Can we know those vehicles which have closer S2 cell ids are closer in distance with each other.
  Or is there any other method which i have to use here to perform the search operation?</p>