Great Circle Calculation
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I got two columns with latitude and longitude values. I need to calculate the distance between the points in every row. I'm trying to use the formula as seen:That's the so called 'great circle' calculation. I need perform this calculation on a huge amount of coordinates.The data looks like that: A B C D E F G- -0 LAT LON rLAT dLAT dLON a DIST1 52.3999.2 52.3992.???3 52.4014.???4 52.4012.???5 52.4015.???6.Now, what I have tried is the following for the field G2 in LibreOffice: C2=RADIANS(A2)D2=RADIANS(A2-A1)E2=RADIANS(B2-B1)F2=SIN(D2/2).SIN(D2/2)+SIN(E2/2).SIN(E2/2).COS(C1).COS(C2)G2=2.ATAN2(SQRT(F2), SQRT(1-F2)).6371The result for G2 is 20015 which is quite. Wrong.How do I calculate the distance between two points specified by latitude and longitude in Microsoft Excel or LibreOffice Calc? What's wrong with my formula?
As found by, this Excel formula to calculate distance between two latitude/longitude points works for me both in LibreOffice Calc and Microsoft Excel 2013: =ACOS(COS(RADIANS(90-A1)).COS(RADIANS(90-A2))+SIN(RADIANS(90-A1)).SIN(RADIANS(90-A2)).COS(RADIANS(B1-B2))).6371The result is in kilometers, for small distances I used.1000 to display the distance in meters. A B C- -0 LAT LON DIST1 52.39992 52.3992 54.83 52.4014 150.94 52.4012 37.65 52.4015 30.86.To display distances in miles, substitute.6371 with.3958. The Haversine method is good as long as you're willing to accept an error factor, or if you must implement with a worksheet formula only.
For short distances and non critical situations it will probably be ok. But if you need precision, you need to use something like the algorithm developed by Thaddeus Vincenty.
Recall that in this formula, we are finding the great circle distance d between two points P and Q which have latitudes ϕ1 and ϕ2 and longitudes λ.
It's results are considered accurate down to millimeters based on the accuracy of the lat/long pairs used. How much difference between the two? Between JFK and Tokyo it's a difference of about 14.9 statute miles (short). Between Los Angeles and Honolulu, you'll only be about 3 miles short of the island.A good implementation of the Vincenty algorithm in Visual Basic (as for Excel) can be found at:The code will run 'as-is' on 32-bit versions of Excel, but will fail with a 'formula too complex' error in the 64-bit version of Excel.
Just below the posting of the entire code I have posted a fix to that problem that enables it to run on both 32 and 64 bit versions of the VBA engine.Regards,J.Latham, Microsoft MVP, Excel 2006-2014.