/// <summary>
 /// Constructor
 /// </summary>
 /// <param name="geohasher">A geohasher implementation</param>
 /// <param name="trieMap">A trie map implementation</param>
 /// <param name="precision">The default search precision. Depending on your data </param>
 public GeohashSpatialIndex(IGeohasher geohasher, IGeohashTrieMap <GeohashIndexEntryList <T>, T> trieMap, int precision = 9)
 {
     _geohasher = geohasher;
     _trieMap   = trieMap;
     _precision = precision;
 }