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69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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---------------------------------------------------------------------------------------------
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Copyright (C) 2002-2022, Chris Veness
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Adaptations Copyright (C) 2023, John Norrbin (JohnEx)
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Adaptations (C) 2023, Ramon F. Kolb (kx1t)
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MIT License:
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or
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sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
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THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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---------------------------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#define PI 3.14159265
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// https://www.movable-type.co.uk/scripts/latlong.html
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double distance(double lat_a, double lon_a, double lat_b, double lon_b)
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{
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double lat_a_scaled = lat_a * (double)PI / 180.0;
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double lat_b_scaled = lat_b * (double)PI / 180.0;
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double lat_delta = (lat_b - lat_a) * (double)PI / 180.0;
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double lon_delta = (lon_b - lon_a) * (double)PI / 180.0;
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double a = sin(lat_delta / 2.0) * sin(lat_delta / 2.0) + cos(lat_a_scaled) * cos(lat_b_scaled) * sin(lon_delta / 2.0) * sin(lon_delta / 2.0);
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double c = 2.0 * atan2(sqrt(a), sqrt(1.0 - a));
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return 6372797.56085 * c;
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}
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int main(int argc, char *argv[])
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{
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if (argc != 5)
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{
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printf("Usage: distance lat1 lon1 lat2 lon2\n");
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return 1;
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}
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double lat1 = atof(argv[1]);
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double lon1 = atof(argv[2]);
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double lat2 = atof(argv[3]);
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double lon2 = atof(argv[4]);
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double d = distance(lat1, lon1, lat2, lon2);
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printf("%f\n", d);
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return 0;
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}
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