geo-index.go
func (geoIndex *geoIndex) Range(topLeft Point, bottomRight Point) []interface{} {
	topLeftIndex := cellOf(topLeft, geoIndex.resolution)
	bottomRightIndex := cellOf(bottomRight, geoIndex.resolution)

	return geoIndex.get(bottomRightIndex.x, topLeftIndex.x, topLeftIndex.y, bottomRightIndex.y)
}
func (geoIndex *geoIndex) Range(topLeft Point, bottomRight Point) []interface{} {
	topLeftIndex := cellOf(topLeft, geoIndex.resolution)
	bottomRightIndex := cellOf(bottomRight, geoIndex.resolution)

	return geoIndex.get(bottomRightIndex.x, topLeftIndex.x, topLeftIndex.y, bottomRightIndex.y)
}
// Range returns the index entries within lat, lng range.