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authorAnton Tananaev <anton.tananaev@gmail.com>2014-09-03 00:09:42 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2014-09-03 00:09:42 +1200
commit66b62de750e75e1081ac8eeccca17f11b297d01a (patch)
tree080e3748138f31e5dd8ab9fba6a61993256acb27 /src/org/traccar/helper/DistanceCalculator.java
parent1f56f881365fbe31736c26c3b5ba848c2fda4f64 (diff)
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Implement position filtering (fix #259)
Diffstat (limited to 'src/org/traccar/helper/DistanceCalculator.java')
-rw-r--r--src/org/traccar/helper/DistanceCalculator.java33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/org/traccar/helper/DistanceCalculator.java b/src/org/traccar/helper/DistanceCalculator.java
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+/*
+ * Copyright 2014 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.helper;
+
+public class DistanceCalculator {
+
+ private static final double equatorialEarthRadius = 6378.1370D;
+ private static final double deg2rad = (Math.PI / 180);
+
+ public static double distance(double lat1, double lon1, double lat2, double lon2) {
+ double dlong = (lon2 - lon1) * deg2rad;
+ double dlat = (lat2 - lat1) * deg2rad;
+ double a = Math.pow(Math.sin(dlat / 2), 2) +
+ Math.cos(lat1 * deg2rad) * Math.cos(lat2 * deg2rad) * Math.pow(Math.sin(dlong / 2), 2);
+ double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+ double d = equatorialEarthRadius * c;
+ return d * 1000;
+ }
+
+}