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Algorithm - How to use php to find the angle based on the longitude and latitude of two points

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Release： 2016-08-04 09:19:15

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It has been several years since I graduated and I have even forgotten trigonometric functions

As shown in the figure, given the longitude and latitude of two points AC or BC, find the angle of α or β

How to implement it with php Thank you

Algorithm - How to use php to find the angle based on the longitude and latitude of two points

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It has been several years since I graduated and I have even forgotten trigonometric functions

As shown in the figure, given the longitude and latitude of two points AC or BC, find the angle of α or β

How to implement it with php Thank you

Algorithm - How to use php to find the angle based on the longitude and latitude of two points

Calculate the length of a, b, c
Angle ACB = rad2deg(asin(a/b));

asin — arcsine, returns the radian corresponding to the sine value, a==sin(asin(a)).

rad2deg — Convert radians to corresponding degrees

Insufficient conditions to calculate.

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