zland-core
Version:
zland core
35 lines (31 loc) • 1.1 kB
JavaScript
/*!
* Copyright 2015 Florian Biewald
*
* 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.
*/
;
function rad(x) {
return x * Math.PI / 180;
};
module.exports = {
calculateMeters: function(p1, p2) {
var R, a, c, d, dLat, dLong;
R = 6378137;
dLat = rad(p2.latitude - p1.latitude);
dLong = rad(p2.longitude - p1.longitude);
a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(rad(p1.latitude)) * Math.cos(rad(p2.latitude)) * Math.sin(dLong / 2) * Math.sin(dLong / 2);
c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
d = R * c;
return d;
}
}