README.md

SQL_GPS_Distance_calculator

This is an example of how to calculate the distance between two GPS coordinates as a function in MySQL.

Formula

For calculating the distance of the two given GPS coordinates, we use the Harversine formula.

Usage

In order to use the distance function, just type

select DISTANCE(24.784734,120.995724,24.785498,120.996633,'KM');

which will return a table with one entry with the requested value.

Distance options

This function can take the following measure of units as inputs:

1. Kilometers: Type 'KILOMETER' or 'KM' as input.
2. Miles: Type 'MILE' or 'MI' as input.

Example

If just want to measure the distace between two GPS coordinates, use a SELECT statement.

select DISTANCE(24.784734,120.995724,24.785498,120.996633,'KM');
select DISTANCE(24.784734,120.995724,24.785498,120.996633,'MI');

Usage in stored procedures or functions

Because the function returns a unique number, it can be used inside functions and stored procedures as follows

if distance(user1_gps_latitude,users1_gps_longitude,user2_gps_latitude,users2_gps_longitude,'KM')<0.09 then
	# Insert your code here
end if;