最近需要做運營商信號地圖，需要檢索某一區域用戶上報的信號質量問題，所以需要用到空間檢索能力，經過調研，geohash和google s2都可以實現相關的能力，但是geohash只有12級別，無法做細粒度的索引，google s2有30level，針對1公里甚至1cm都可以做索引，最終選擇google s2 的level12 13 14三個級別作為索引。

maven依賴

<!-- google s2 --> <dependency><groupId>io.sgr</groupId><artifactId>s2-geometry-library-java</artifactId><version>1.0.0</version> </dependency>

根據坐標建立cell,level選擇13級別，覆蓋范圍1平方公里。將cell存入數據庫中，作為索引字段

import com.google.common.geometry.*; double lat=30.2; double lng=116.3; int currentLevel =13; S2LatLng s2LatLng = S2LatLng.fromDegrees(lat, lng); S2CellId cellId = S2CellId.fromLatLng(s2LatLng).parent(currentLevel);

? 2.獲取cell的四個頂點

class Gps {private double wgLat;private double wgLon;public Gps(double wgLat, double wgLon) {setWgLat(wgLat);setWgLon(wgLon);}public double getWgLat() {return wgLat;}public void setWgLat(double wgLat) {this.wgLat = wgLat;}public double getWgLon() {return wgLon;}public void setWgLon(double wgLon) {this.wgLon = wgLon;}@Overridepublic String toString() {return wgLat + "," + wgLon;} }//由于google s2默認使用gps坐標系，在國內無法使用，需要轉換為國內的gcj坐標或者bd09坐標，轉換方法可自行上網查詢 List<Gps> points = new ArrayList();S2CellId curId = new S2CellId(35234364754L); S2Cell curCell = new S2Cell(curId); S2LatLng v0 = new S2LatLng(curCell.getVertex(0)); //將gps坐標轉換為bd09坐標 Gps gps0 = PositionUtils.gps84_To_Bd09(v0.latDegrees(), v0.lngDegrees()); points.add(gps0);S2LatLng v1 = new S2LatLng(curCell.getVertex(1)); Gps gps1 = PositionUtils.gps84_To_Bd09(v1.latDegrees(), v1.lngDegrees()); points.add(gps1);S2LatLng v2 = new S2LatLng(curCell.getVertex(2)); Gps gps2 = PositionUtils.gps84_To_Bd09(v2.latDegrees(), v2.lngDegrees()); points.add(gps2);S2LatLng v3 = new S2LatLng(curCell.getVertex(3)); Gps gps3 = PositionUtils.gps84_To_Bd09(v3.latDegrees(), v3.lngDegrees()); points.add(gps3);return points;

3.獲取level為7的cell的所有level為9的cell

S2CellId cellId = new S2CellId(3654375874L); childrenCell(cellId,9);public static List<S2CellId> childrenCell(S2CellId cellId, int desLevel) {List<S2CellId> list = childrenCellId(new ArrayList<S2CellId>(), cellId, cellId.level(), desLevel);return list;}private static List<S2CellId> childrenCellId(List<S2CellId> list, S2CellId cellId, int currentLevel, int desLevel) {if (currentLevel < desLevel) {long interval = cellId.childEnd().id() - cellId.childBegin().id();interval = interval / 4;for (int i = 0; i < 4; i++) {long id = cellId.childBegin().id() + interval * i;S2CellId newCellId = new S2CellId(id);//System.out.println(newCellId);childrenCellId(list, newCellId, currentLevel + 1, desLevel);}} else {list.add(cellId);return list;}return list;}

4.獲取矩形區域內所有的cell

S2LatLng startS2 = S2LatLng.fromDegrees(lat, lng); S2LatLng endS2 = S2LatLng.fromDegrees(lat1, lng1); S2LatLngRect rect = new S2LatLngRect(startS2, endS2);//獲取region區域內的cell S2RegionCoverer s2RegionCoverer = new S2RegionCoverer(); s2RegionCoverer.setMaxLevel(14); s2RegionCoverer.setMinLevel(13); S2CellUnion covering = s2RegionCoverer.getCovering(rect); return covering.cellIds();

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總結

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