Java DistanceUtils.dist2Degrees方法代码示例

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
/**
 * Returns a list of location near a certain coordinate. 
 * @param latitude, @param longitude - Center of search area 
 * @param distanceInMiles - Search Radius in miles
 * @param indexerPath - Path to Lucene index
 * @param count - Upper bound to number of results
 * @return - List of locations sorted by population
 * @throws IOException
 */
public List<Location> searchNearby(Double latitude, Double longitude, Double distanceInMiles, String indexerPath, int count) throws IOException {
	
	double distanceInDeg = DistanceUtils.dist2Degrees(distanceInMiles,DistanceUtils.EARTH_EQUATORIAL_RADIUS_MI);
	SpatialArgs spatialArgs = new SpatialArgs(SpatialOperation.IsWithin,
			ctx.makeCircle(longitude,latitude, distanceInDeg));
	
	String key = latitude+"-"+longitude;
	Filter filter = strategy.makeFilter(spatialArgs);
	
	IndexSearcher searcher = new IndexSearcher(createIndexReader(indexerPath));
	Sort sort = new Sort(populationSort);
	TopDocs topDocs = searcher.search(new MatchAllDocsQuery(), filter, count, sort);

	ScoreDoc[] scoreDocs = topDocs.scoreDocs;
	HashMap<String, List<Location>> allCandidates = new HashMap<String, List<Location>>();

	getMatchingCandidates(searcher, allCandidates, key, scoreDocs);
	List<Location> results = allCandidates.get(key);
	
	return results;
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
protected void initMaxLevels() {
  String mlStr = args.get(MAX_LEVELS);
  if (mlStr != null) {
    maxLevels = Integer.valueOf(mlStr);
    return;
  }

  double degrees;
  String maxDetailDistStr = args.get(MAX_DIST_ERR);
  if (maxDetailDistStr == null) {
    if (!ctx.isGeo()) {
      return;//let default to max
    }
    degrees = DistanceUtils.dist2Degrees(DEFAULT_GEO_MAX_DETAIL_KM, DistanceUtils.EARTH_MEAN_RADIUS_KM);
  } else {
    degrees = Double.parseDouble(maxDetailDistStr);
  }
  maxLevels = getLevelForDistance(degrees);
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
/**
 * Implemented for compatibility with Solr 3 spatial geofilt & bbox query parsers:
 * {@link SpatialQueryable}.
 */
@Override
public Query createSpatialQuery(QParser parser, SpatialOptions options) {
  //--WARNING: the code from here to the next marker is identical to LatLonType's impl.
  double[] point = null;
  try {
    point = ParseUtils.parseLatitudeLongitude(options.pointStr);
  } catch (InvalidShapeException e) {
    throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
  }

  // lat & lon in degrees
  double latCenter = point[0];
  double lonCenter = point[1];

  double distDeg = DistanceUtils.dist2Degrees(options.distance, options.radius);
  //--END-WARNING

  Shape shape = ctx.makeCircle(lonCenter, latCenter, distDeg);
  if (options.bbox)
    shape = shape.getBoundingBox();

  SpatialArgs spatialArgs = new SpatialArgs(SpatialOperation.Intersects, shape);
  return getQueryFromSpatialArgs(parser, options.field, spatialArgs);
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
/**
 * Returns a geoquery.
 */
public Filter geoSearch(String value) {
  GeopositionComparator comp = (GeopositionComparator) prop.getComparator();
  double dist = comp.getMaxDistance();
  double degrees = DistanceUtils.dist2Degrees(dist, DistanceUtils.EARTH_MEAN_RADIUS_KM * 1000.0);
  Shape circle = spatialctx.makeCircle(parsePoint(value), degrees);
  SpatialArgs args = new SpatialArgs(SpatialOperation.Intersects, circle);
  return strategy.makeFilter(args);
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
@Test
public void testOneMeterPrecision() {
  init(GeohashPrefixTree.getMaxLevelsPossible());
  GeohashPrefixTree grid = (GeohashPrefixTree) ((RecursivePrefixTreeStrategy) strategy).getGrid();
  //DWS: I know this to be true.  11 is needed for one meter
  double degrees = DistanceUtils.dist2Degrees(0.001, DistanceUtils.EARTH_MEAN_RADIUS_KM);
  assertEquals(11, grid.getLevelForDistance(degrees));
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
@Test
public void testPrecision() throws IOException{
  init(GeohashPrefixTree.getMaxLevelsPossible());

  Point iPt = ctx.makePoint(2.8028712999999925, 48.3708044);//lon, lat
  addDocument(newDoc("iPt", iPt));
  commit();

  Point qPt = ctx.makePoint(2.4632387000000335, 48.6003516);

  final double KM2DEG = DistanceUtils.dist2Degrees(1, DistanceUtils.EARTH_MEAN_RADIUS_KM);
  final double DEG2KM = 1 / KM2DEG;

  final double DIST = 35.75;//35.7499...
  assertEquals(DIST, ctx.getDistCalc().distance(iPt, qPt) * DEG2KM, 0.001);

  //distErrPct will affect the query shape precision. The indexed precision
  // was set to nearly zilch via init(GeohashPrefixTree.getMaxLevelsPossible());
  final double distErrPct = 0.025; //the suggested default, by the way
  final double distMult = 1+distErrPct;

  assertTrue(35.74*distMult >= DIST);
  checkHits(q(qPt, 35.74 * KM2DEG, distErrPct), 1, null);

  assertTrue(30*distMult < DIST);
  checkHits(q(qPt, 30 * KM2DEG, distErrPct), 0, null);

  assertTrue(33*distMult < DIST);
  checkHits(q(qPt, 33 * KM2DEG, distErrPct), 0, null);

  assertTrue(34*distMult < DIST);
  checkHits(q(qPt, 34 * KM2DEG, distErrPct), 0, null);
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
/**
 * Implemented for compatibility with geofilt & bbox query parsers:
 * {@link SpatialQueryable}.
 */
@Override
public Query createSpatialQuery(QParser parser, SpatialOptions options) {
  Point pt = SpatialUtils.parsePointSolrException(options.pointStr, ctx);

  double distDeg = DistanceUtils.dist2Degrees(options.distance, options.radius);

  Shape shape = ctx.makeCircle(pt, distDeg);
  if (options.bbox)
    shape = shape.getBoundingBox();

  SpatialArgs spatialArgs = new SpatialArgs(SpatialOperation.Intersects, shape);
  return getQueryFromSpatialArgs(parser, options.field, spatialArgs);
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
/**
 * {@inheritDoc}
 */
@Override
public Shape toSpatial4j(SpatialContext spatialContext) {
    double kms = distance.getValue(GeoDistanceUnit.KILOMETRES);
    double d = DistanceUtils.dist2Degrees(kms, DistanceUtils.EARTH_MEAN_RADIUS_KM);
    return spatialContext.makeCircle(longitude, latitude, d);
}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
private void checkHits(String fieldName, boolean exact, String ptStr, double distKM, int count, int ... docIds) throws ParseException {
  if (exact && fieldName.equalsIgnoreCase("bbox")) {
    return; // bbox field only supports rectangular query
  }
  String [] tests = new String[docIds != null && docIds.length > 0 ? docIds.length + 1 : 1];
  //test for presence of required ids first
  int i = 0;
  if (docIds != null && docIds.length > 0) {
    for (int docId : docIds) {
      tests[i++] = "//result/doc/*[@name='id'][.='" + docId + "']";
    }
  }
  //check total length last; maybe response includes ids it shouldn't.  Nicer to check this last instead of first so
  // that there may be a more specific detailed id to investigate.
  tests[i++] = "*[count(//doc)=" + count + "]";

  //Test using the Lucene spatial syntax
  {
    //never actually need the score but lets test
    String score = new String[]{null, "none","distance","recipDistance"}[random().nextInt(4)];

    double distDEG = DistanceUtils.dist2Degrees(distKM, DistanceUtils.EARTH_MEAN_RADIUS_KM);
    Point point = SpatialUtils.parsePoint(ptStr, SpatialContext.GEO);
    String circleStr = "BUFFER(POINT(" + point.getX()+" "+point.getY()+")," + distDEG + ")";
    String shapeStr;
    if (exact) {
      shapeStr = circleStr;
    } else {//bbox
      //the GEO is an assumption
      SpatialContext ctx = SpatialContext.GEO;
      Rectangle bbox = ctx.readShapeFromWkt(circleStr).getBoundingBox();
      shapeStr = "ENVELOPE(" + bbox.getMinX() + ", " + bbox.getMaxX() +
          ", " + bbox.getMaxY() + ", " + bbox.getMinY() + ")";
    }

    //FYI default distErrPct=0.025 works with the tests in this file
    assertQ(req(
          "fl", "id", "q","*:*", "rows", "1000",
          "fq", "{!field f=" + fieldName + (score==null?"":" score="+score)
            + "}Intersects(" + shapeStr + ")"),
        tests);
  }
  //Test using geofilt
  {
    assertQ(req(
        "fl", "id", "q", "*:*", "rows", "1000",
        "fq", "{!" + (exact ? "geofilt" : "bbox") + " sfield=" + fieldName + " pt='" + ptStr + "' d=" + distKM + "}"),
        tests);
  }

}
 

import com.spatial4j.core.distance.DistanceUtils; //导入方法依赖的package包/类
private void checkHits(String fieldName, boolean exact, String ptStr, double distKM, int count, int ... docIds) {
  String [] tests = new String[docIds != null && docIds.length > 0 ? docIds.length + 1 : 1];
  //test for presence of required ids first
  int i = 0;
  if (docIds != null && docIds.length > 0) {
    for (int docId : docIds) {
      tests[i++] = "//result/doc/*[@name='id'][.='" + docId + "']";
    }
  }
  //check total length last; maybe response includes ids it shouldn't.  Nicer to check this last instead of first so
  // that there may be a more specific detailed id to investigate.
  tests[i++] = "*[count(//doc)=" + count + "]";

  //Test using the Solr 4 syntax
  {
    //never actually need the score but lets test
    String score = new String[]{null, "none","distance","recipDistance"}[random().nextInt(4)];

    double distDEG = DistanceUtils.dist2Degrees(distKM, DistanceUtils.EARTH_MEAN_RADIUS_KM);
    String circleStr = "Circle(" + ptStr.replaceAll(" ", "") + " d=" + distDEG + ")";
    String shapeStr;
    if (exact) {
      shapeStr = circleStr;
    } else {//bbox
      //the GEO is an assumption
      SpatialContext ctx = SpatialContext.GEO;
      shapeStr = ctx.toString( ctx.readShape(circleStr).getBoundingBox() );
    }

    //FYI default distErrPct=0.025 works with the tests in this file
    assertQ(req(
          "fl", "id", "q","*:*", "rows", "1000",
          "fq", "{!field f=" + fieldName + (score==null?"":" score="+score)
            + "}Intersects(" + shapeStr + ")"),
        tests);
  }
  //Test using the Solr 3 syntax
  {
    assertQ(req(
        "fl", "id", "q", "*:*", "rows", "1000",
        "fq", "{!" + (exact ? "geofilt" : "bbox") + " sfield=" + fieldName + " pt='" + ptStr + "' d=" + distKM + "}"),
        tests);
  }

}