While this is possible (for longitude and latitude), it does involve a lot of complex math to accomplish the job. A Google search lists a variety of formulas to accomplish the job, most of which should work fine with Couchbase.
You’ll be using various number functions like ACOS, etc.
@badrictl You can’t directly do radius search with Spatial Views. You would need to do that in your application. You would calculate a bounding box around the radius you want to search for, and then filter out the false positives.