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16 lines
440 B
16 lines
440 B
CREATE OR REPLACE FUNCTION `get_bearing`(
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lon1 DOUBLE,
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lat1 DOUBLE,
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lon2 DOUBLE,
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lat2 DOUBLE
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) RETURNS double
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BEGIN
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SET @rlat1 = deg2rad(lat1);
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SET @rlat2 = deg2rad(lat2);
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SET @rlon1 = deg2rad(lon1);
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SET @rlon2 = deg2rad(lon2);
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SET @dlon = deg2rad(lon2 - lon1);
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SET @b = atan2(sin(@dlon) * cos(@rlat2), cos(@rlat1) * sin(@rlat2) - sin(@rlat1) * cos(@rlat2) * cos(@dlon));
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SET @bd = rad2deg(@b);
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RETURN MOD(@bd + 360, 360);
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END;
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