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author | Anton Tananaev <anton.tananaev@gmail.com> | 2014-09-03 00:09:42 +1200 |
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committer | Anton Tananaev <anton.tananaev@gmail.com> | 2014-09-03 00:09:42 +1200 |
commit | 66b62de750e75e1081ac8eeccca17f11b297d01a (patch) | |
tree | 080e3748138f31e5dd8ab9fba6a61993256acb27 /src/org/traccar/helper/DistanceCalculator.java | |
parent | 1f56f881365fbe31736c26c3b5ba848c2fda4f64 (diff) | |
download | traccar-server-66b62de750e75e1081ac8eeccca17f11b297d01a.tar.gz traccar-server-66b62de750e75e1081ac8eeccca17f11b297d01a.tar.bz2 traccar-server-66b62de750e75e1081ac8eeccca17f11b297d01a.zip |
Implement position filtering (fix #259)
Diffstat (limited to 'src/org/traccar/helper/DistanceCalculator.java')
-rw-r--r-- | src/org/traccar/helper/DistanceCalculator.java | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/org/traccar/helper/DistanceCalculator.java b/src/org/traccar/helper/DistanceCalculator.java new file mode 100644 index 000000000..072f3d7a8 --- /dev/null +++ b/src/org/traccar/helper/DistanceCalculator.java @@ -0,0 +1,33 @@ +/* + * 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; + } + +} |