MSCEWI2069

ST_DISTANCE results are slightly different from ST_SPHERICALDISTANCE

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Severity

Low

Description

The Teradata function ST_SPHERICALDISTANCE calculates the distance between two spherical coordinates on the planet using the Haversine formula, on the other side, the Snowflake ST_DISTANCE function does not utilize the haversine formula to calculate the minimum distance between two geographical points.

Example Code

Input Code:

--The distance between New York and Los Angeles
Select Cast('POINT(-73.989308 40.741895)' As ST_GEOMETRY) As location1,
	Cast('POINT(40.741895 34.053691)' As ST_GEOMETRY) As location2,
	location1.ST_SPHERICALDISTANCE(location2) As Distance_In_km;

Output Code

--The distance between New York and Los Angeles
SELECT
TO_GEOGRAPHY('POINT(-73.989308 40.741895)') As location1,
TO_GEOGRAPHY('POINT(40.741895 34.053691)') As location2,
--** MSC-WARNING - MSCEWI2069 - ST_DISTANCE RESULTS ARE SLIGHTLY DIFFERENT FROM ST_SPHERICALDISTANCE **
ST_DISTANCE(location1, location2) As Distance_In_km;

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