public static HashSet <GeoObj> SearchGeoHashIndex(SessionBase session, double lat, double lon, double radius) { HashSet <GeoObj> resultSet = new HashSet <GeoObj>(); WGS84Point center = new WGS84Point(lat, lon); GeoHashCircleQuery query = new GeoHashCircleQuery(center, radius); // radius in meters BoundingBox bbox = query.BoundingBox; var btreeSet = session.AllObjects <BTreeSet <GeoObj> >().FirstOrDefault(); foreach (GeoHash hash in query.SearchHashes) { var itr = btreeSet.Iterator(); itr.GoTo(new GeoObj(hash.LongValue)); var current = itr.Current(); while (current != null) { GeoHash geoHash = GeoHash.FromLongValue(current.GeoHashAsLong); if ((geoHash.SignificantBits >= hash.SignificantBits && geoHash.Within(hash)) || (geoHash.SignificantBits < hash.SignificantBits && hash.Within(geoHash))) { if (!(current.Latitude < bbox.MinLat || current.Latitude > bbox.MaxLat || current.Longitude < bbox.MinLon || current.Longitude > bbox.MaxLon)) { resultSet.Add(current); } current = itr.Next(); } else { break; } } } return(resultSet); }
public TwoGeoHashBoundingBox(GeoHash bottomLeft, GeoHash topRight) { if (bottomLeft.SignificantBits != topRight.SignificantBits) { throw new System.ArgumentException("Does it make sense to iterate between hashes that have different precisions?"); } m_bottomLeft = GeoHash.FromLongValue(bottomLeft.LongValue, bottomLeft.SignificantBits); m_topRight = GeoHash.FromLongValue(topRight.LongValue, topRight.SignificantBits); m_boundingBox = m_bottomLeft.BoundingBox; m_boundingBox.ExpandToInclude(m_topRight.BoundingBox); }
public static HashSet <GeoObj> SearchGeoHashIndex(SessionBase session, double minLat, double minLon, double maxLat, double maxLon) { HashSet <GeoObj> resultSet = new HashSet <GeoObj>(); if (minLat > maxLat) { double t = minLat; minLat = maxLat; maxLat = t; } if (minLon > maxLon) { double t = minLon; minLon = maxLon; maxLon = t; } WGS84Point min = new WGS84Point(minLat, minLon); WGS84Point max = new WGS84Point(maxLat, maxLon); BoundingBox bbox = new BoundingBox(min, max); GeoHashBoundingBoxQuery query = new GeoHashBoundingBoxQuery(bbox); var btreeSet = session.AllObjects <BTreeSet <GeoObj> >().FirstOrDefault(); foreach (GeoHash hash in query.SearchHashes) { var itr = btreeSet.Iterator(); itr.GoTo(new GeoObj(hash.LongValue)); var current = itr.Current(); while (current != null) { GeoHash geoHash = GeoHash.FromLongValue(current.GeoHashAsLong); if ((geoHash.SignificantBits >= hash.SignificantBits && geoHash.Within(hash)) || (geoHash.SignificantBits < hash.SignificantBits && hash.Within(geoHash))) { if (!(current.Latitude < bbox.MinLat || current.Latitude > bbox.MaxLat || current.Longitude < bbox.MinLon || current.Longitude > bbox.MaxLon)) { resultSet.Add(current); } current = itr.Next(); } else { break; } } } return(resultSet); }
public static HashSet <Person> SearchGeoHashIndex(string bootDirectory, double minLat, double minLon, double maxLat, double maxLon) { HashSet <Person> resultSet = new HashSet <Person>(); if (minLat > maxLat) { double t = minLat; minLat = maxLat; maxLat = t; } if (minLon > maxLon) { double t = minLon; minLon = maxLon; maxLon = t; } WGS84Point min = new WGS84Point(minLat, minLon); WGS84Point max = new WGS84Point(maxLat, maxLon); BoundingBox bbox = new BoundingBox(min, max); GeoHashBoundingBoxQuery query = new GeoHashBoundingBoxQuery(bbox); using (SessionNoServer session = new SessionNoServer(bootDirectory)) { session.BeginRead(); BTreeMap <Int64, VelocityDbList <Person> > btreeMap = session.AllObjects <BTreeMap <Int64, VelocityDbList <Person> > >().FirstOrDefault(); foreach (GeoHash hash in query.SearchHashes) { BTreeMapIterator <Int64, VelocityDbList <Person> > itr = btreeMap.Iterator(); itr.GoTo(hash.LongValue); var current = itr.Current(); while (current.Value != null) { GeoHash geoHash = GeoHash.FromLongValue(current.Key); if (geoHash.Within(hash) || (geoHash.SignificantBits > hash.SignificantBits && hash.Within(geoHash))) { foreach (Person person in current.Value) { resultSet.Add(person); } current = itr.Next(); } else { break; } } } // actual geohash bounding box may be including some that are not within requested bounding box so remove such items if any HashSet <Person> notWithin = new HashSet <Person>(); foreach (Person person in resultSet) { if (person.Lattitude < min.Latitude || person.Lattitude > max.Latitude || person.Longitude < min.Longitude || person.Lattitude > max.Latitude) { notWithin.Add(person); } } foreach (Person person in notWithin) { resultSet.Remove(person); } foreach (Person person in resultSet) { Console.WriteLine(person.ToString() + " Lattitude: " + person.Lattitude + " Longitude: " + person.Longitude); } session.Commit(); } return(resultSet); }