Brian Dunning's FileMaker Custom Functions

HaversineDistance ( latx ; lony ; laty ; lony ; units )

compute shortest distance

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john renfrew   john renfrew - Show more from this author
attitude

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  Sample input:
HaversineDistance ( 36.12 ; -86.67 ; 33.94 ; -118.4 ; "" )
  Sample output:
1794 mi 105.88 yds

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

The haversine formula is an equation important in navigation, returning great-circle distances between two points on a sphere from their longitudes and latitudes.

 

Comments

Tim Anderson   Tim Anderson, Tim Anderson Group
Mar 4, 2015
Just to repay the compliment John, you a typo or 2!


HaversineDistance ( latx ; lony ; lat y ; lony ; units )
should be


HaversineDistance ( latx ; lonx ; laty ; lony ; units )?

Tim
 
john renfrew   john renfrew, attitude
Mar 4, 2015
Tim
Well spotted Mr Darcy...
Jeremy Bante's custom function uses the more complex Andoyer-Lambert-Thomas method if the coordinates are in the WGS84 coordinate system, and is more accurate, but this is within 99.98% of that, so for use in short distance calculations is as effective

https://github.com/jbante/FileMaker-Techniques/blob/master/CustomFunctions/Location/LocationDistanceValues.fmfn
 

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Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

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