public static TwoGeoHashBoundingBox WithCharacterPrecision(BoundingBox bbox, int numberOfCharacters)
{
GeoHash bottomLeft = GeoHash.WithCharacterPrecision(bbox.MinLat, bbox.MinLon, numberOfCharacters);
GeoHash topRight = GeoHash.WithCharacterPrecision(bbox.MaxLat, bbox.MaxLon, numberOfCharacters);
return new TwoGeoHashBoundingBox(bottomLeft, topRight);
}