Example usage for org.apache.lucene.util SloppyMath TO_RADIANS

Introduction

In this page you can find the example usage for org.apache.lucene.util SloppyMath TO_RADIANS.

Prototype

double TO_RADIANS

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Usage

From source file:org.codelibs.elasticsearch.common.geo.GeoUtils.java

License:Apache License

/**
 * Return the distance (in meters) between 2 lat,lon geo points using a simple tangential plane
 * this provides a faster alternative to {GeoUtils#arcDistance} when points are within 5 km
 *//*from  w w  w .  jav  a  2  s .com*/
public static double planeDistance(double lat1, double lon1, double lat2, double lon2) {
    double x = (lon2 - lon1) * SloppyMath.TO_RADIANS * Math.cos((lat2 + lat1) / 2.0 * SloppyMath.TO_RADIANS);
    double y = (lat2 - lat1) * SloppyMath.TO_RADIANS;
    return Math.sqrt(x * x + y * y) * EARTH_MEAN_RADIUS;
}

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