How to compare the distance given by the GPS (WGS84) with a ground truth given by pro

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I would like to compare the result given by a GPS (WGS84) to a ground truth with only the projection matrix given (So rotation matrix 3x3 and translation vector 3x1).

For example I have this from the GPS:

Position 1

lat: latitude of the oxts-unit (deg) --> 48.972104544468

lon: longitude of the oxts-unit (deg) --> 8.4761469953335

alt: altitude of the oxts-unit (m) --> 201.86813354492

Position 2

lat: latitude of the oxts-unit (deg) --> 48.972103212661

lon: longitude of the oxts-unit (deg) --> 8.4761506974488

alt: altitude of the oxts-unit (m) --> 201.88606262207

Using this tool http://www.movable-type.co.uk/scripts/latlong.html , I was able to compute the distance. The result for those two positions is: 0.0003081km

Ground truth

I have in my ground truth for those two position the projection matrix: rotation 3x3 and translation part 3x1. Here the translation part (x y z)

0.000000 0.000000 -0.000000

-0.014018 1.198998 -0.02820

My first attempt was to compute the euclidian distance taking as an input the three component of the translation vector x y and z (sqrt((x1+x2)^2 + (y1+y2)^2 + (z3+z3)^2 )

But I have this result 1.19941157137

It's not at all the same.

Maybe I'm mistaken. Can someone helps me ?

Thanks



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