Question

我的任务是找到靠近给定用户位置的出租车司机（类似于Grab / Lyft）。我有司机＆＃39;带时间戳的位置（纬度，经度）。这些数据每2分钟由移动设备推送到我的服务器。当用户请求乘坐时，我需要使用驱动程序找到最近的驱动程序＆＃39;数据。我试图使用Lucene的GeoSpatial搜索。我已经使用驱动程序数据进行索引，并根据用户的经度和经度进行搜索。我还能够使用给定的纬度/经度组合进行搜索，并获得距离参数最近的司机。但我不知道如何在搜索查询中添加另一个参数来指定驱动程序数据的时间戳。例如，我想仅搜索在特定时间戳附近的给定位置的驾驶员。有人可以帮我弄这个吗？这是我使用的代码段：

package com.test.trials;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.Paths;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.StoredField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.spatial3d.Geo3DPoint;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.document.LatLonPoint;

public class LuceneTrial {

    private IndexSearcher searcher;

    public static void main(String[] args) throws IOException {
        LuceneTrial trial = new LuceneTrial();
        trial.generateData();
        trial.search();
    }

    private void generateData() throws IOException {
        Directory dir = FSDirectory.open(Paths.get("C:/temp/Lucene"));
        Analyzer analyzer = new StandardAnalyzer();
        IndexWriterConfig iwc = new IndexWriterConfig(analyzer);
        iwc.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
        IndexWriter writer = new IndexWriter(dir, iwc);

        try (BufferedReader br = new BufferedReader(new FileReader(
                "C:/temp/Lucene/Drivers.csv"))) {
            String line;
            String[] fieldNames = new String[] { "Driver ID", "Latitude", "Longitude", "Time" };
            while ((line = br.readLine()) != null) {
                // process the line.
                String[] tags = line.split(",");
                Document doc = new Document();
                for (int i = 0; i < fieldNames.length; i++)
                    doc.add(new StoredField(fieldNames[i], tags[i]));

                // Add a latlon point to index
                try {
                    doc.add(new LatLonPoint("latlon", Double
                            .parseDouble(tags[1]), Double.parseDouble(tags[2])));
                    Geo3DPoint point = new Geo3DPoint("geo3d",
                            Double.parseDouble(tags[1]),
                            Double.parseDouble(tags[2]));
                    doc.add(point);
                } catch (Exception e) {
                    System.out.println("Skipped: " + line);
                }
                writer.addDocument(doc);
            }
        }
        searcher = new IndexSearcher(DirectoryReader.open(writer));
    }

    public void search() throws IOException {
        System.out
                .println("\nLatLonQuery around given point, 10km radius --------------------------------------");
        TopDocs docs = searcher.search(LatLonPoint.newDistanceQuery("latlon",
                6.9270790, 79.8612430, 10 * 1000), 20);
        for (ScoreDoc scoreDoc : docs.scoreDocs) {
            Document doc = searcher.doc(scoreDoc.doc);
            System.out.println(doc);
        }
    }

}

以下是我使用的示例数据：

Driver ID   Latitude    Longitude   Time
1   -6.081689   145.391881  7:01:17
2   -5.207083   145.7887    8:32:40
3   -5.826789   144.295861  8:40:49
4   -6.569828   146.726242  8:57:33
5   -9.443383   147.22005   6:14:26
6   -3.583828   143.669186  8:13:35
7   61.160517   -45.425978  8:58:24
8   64.190922   -51.678064  7:42:16
9   67.016969   -50.689325  6:52:20
10  76.531203   -68.703161  6:08:21
11  65.659994   -18.072703  7:57:45
12  65.283333   -14.401389  7:32:23
13  64.295556   -15.227222  8:20:26
14  65.952328   -17.425978  8:51:34
15  66.058056   -23.135278  8:33:43
16  63.985  -22.605556  7:39:35
17  65.555833   -23.965 7:20:54
18  64.13   -21.940556  7:37:48
19  66.133333   -18.916667  6:46:36
20  63.424303   -20.278875  7:15:12
21  46.485001   -84.509445  6:14:15
22  50.056389   -97.0325    7:12:15
23  44.639721   -63.499444  6:15:31
24  51.391944   -56.083056  7:15:50
25  49.082222   -125.7725   6:52:22

有人可以告诉我如何根据两个属性 - 距离和时间来搜索驱动程序吗？

Answer 1

您可以使用BooleanQuery来解决您的使用案例。以下是您的搜索功能的外观：

public void search() throws IOException {
        System.out
                .println("\nLatLonQuery around given point, 10km radius --------------------------------------");
        Query distQuery = LatLonPoint.newDistanceQuery("latlon", -6.08165, 145.8612430, dist * 1000);
        long startTime=0;//adjust according to your needs
        long endTime=Long.Max_VALUE;//adjust according to your needs
        Query timeQuery = LongPoint.newRangeQuery("timestamp", startTime, endTime);

        BooleanQuery booleanQuery = new BooleanQuery.Builder()
            .add(distQuery, Occur.MUST)
            .add(timeQuery, Occur.MUST)
            .build();
        TopDocs docs = searcher.search(booleanQuery, 20);
        for (ScoreDoc scoreDoc : docs.scoreDocs) {
            Document doc = searcher.doc(scoreDoc.doc);
            System.out.println(doc);
        }
    }

使用Lucene进行带时间戳的地理空间搜索

1 个答案: