Dear experts, 

I was wondering what formula the web utility for calculating distance between two coordinates (https://www.sdmproject.com/utilities/?sh...) employs. I gather that this is not outputting a normal euclidean distance since the result provided by the web utility differs from the result I obtain when performing the computation manually. 

Best,

Gaël

Dear Gaël

The website uses the standard formula...

Can you share an example?

With best wishes.

Joaquim

Thank you very much for anwsering so quickly.

Take these two coordinates:
a: -62 -28 28
b: -53 -37 25

The web utility determines that there is a 9mm difference between them.
However, when using matlab to calculate the same distance (code below) i get 13.0767 mm.

x = (a(1) - b(1))^2
y = (a(2) - b(2))^2
z = (a(3) - b(3))^2
ed = sqrt(x + y + z)

Maybe I'm messing up my code...?

Thank you

Oh! You should separate the numbers with commas, i.e.:
a: -62,-28,28
b: -53,-37,25
And the answer will be 13.0767 as you had calculated.
:-)

Ohhhh!!!!
I see, I should have thought about trying that
Thank you for satisfying my curiosity.

Best,

Gaël