I have a pair of longitude latitude coordinates that I’m trying to measure the distance between in KM
If I cross-reference this “distance” result in ArcGIS Pro, I get approximately 1.44km
This is also roughly the same result if I use a online calculator;
My question, is how does the result 0.01630799258600798 translate to 1.44km? is there something I’m missing??
While I’m not 100% sure on this - typically most transformers perform calculations based on the x-y units. In this case the “distance” is likely a result if FME assumed that the coordinates were all in meters (or feet) rather than Lat-Long (i.e the result is in decimal degrees). Essentially I don’t think FME takes in to account the coordinate systems here when performing these kinds of calculations.
Typically it is recommended to first project the data into an appropriate local (grid based) coordinate system. Then you will get meters (or feet) as a result.
Here’s some more reading which might help:
https://support.safe.com/hc/en-us/articles/25407476391821-Coordinate-Systems-and-Measurements-with-the-Reprojector
What
Consulting my cheatsheet:
0.01 degree of latitude is 1.113 km
at a latitude of -45 degrees 0.01 degree of longitude is 0.788 km
So… ballpark off the top of my head math, looking at the direction of your line, I’d say it’s correct.
You can try the GeographicLengthCalculator (as described here) as an alternative to Matt’s suggestion.
Awesome thank you for that.