A 
geohash is a convenient way of expressing a location (anywhere in the world) 
    using a short alphanumeric string, with greater precision obtained with longer strings.
    
    The 
ol/geohash adds functions to convert a geohash to/from a latitude/longitude point,
    and to determine bounds of a geohash cell and find neighbours of a geohash.
    
    Geohash can be used with permalink.