go get -u github.com/umpc/go-zrange

Package zrange implements an efficient algorithm for performing geospatial range queries with Geohash-encoded keys and a search radius.

The RadialRange method appears to be sufficient for range queries of around 5,000km or less. Changes that efficiently add support for larger query ranges are welcome.

...

rangeParams := zrange.RadialRangeParams{
  Radius:    32.18688,
  Latitude:  37.334722,
  Longitude: -122.008889,
}

keyRanges := rangeParams.RadialRange()

...

Note: Geohash range searches are imprecise. Results should be filtered using the input radius where precision is desired.

• The RadialRange method was inspired by the algorithm in the "Search" section of this page.