Created
July 18, 2013 03:13
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T-SQL Distance between two coordinates.
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create FUNCTION [dbo].[DistanceBetween] (@Lat1 as real, | |
@Long1 as real, @Lat2 as real, @Long2 as real) | |
RETURNS Decimal | |
AS | |
BEGIN | |
DECLARE @dLat1InRad as float(53); | |
SET @dLat1InRad = @Lat1 * (PI()/180.0); | |
DECLARE @dLong1InRad as float(53); | |
SET @dLong1InRad = @Long1 * (PI()/180.0); | |
DECLARE @dLat2InRad as float(53); | |
SET @dLat2InRad = @Lat2 * (PI()/180.0); | |
DECLARE @dLong2InRad as float(53); | |
SET @dLong2InRad = @Long2 * (PI()/180.0); | |
DECLARE @dLongitude as float(53); | |
SET @dLongitude = @dLong2InRad - @dLong1InRad; | |
DECLARE @dLatitude as float(53); | |
SET @dLatitude = @dLat2InRad - @dLat1InRad; | |
/* Intermediate result a. */ | |
DECLARE @a as float(53); | |
SET @a = SQUARE (SIN (@dLatitude / 2.0)) + COS (@dLat1InRad) | |
* COS (@dLat2InRad) | |
* SQUARE(SIN (@dLongitude / 2.0)); | |
/* Intermediate result c (great circle distance in Radians). */ | |
DECLARE @c as real; | |
SET @c = 2.0 * ATN2 (SQRT (@a), SQRT (1.0 - @a)); | |
DECLARE @kEarthRadius as real; | |
SET @kEarthRadius = 3956.0; /* miles */ | |
/* SET @kEarthRadius = 6376.5; kms */ | |
DECLARE @dDistance as real; | |
SET @dDistance = @kEarthRadius * @c; | |
return cast(@dDistance as Decimal(6,2)); | |
END |
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