what do you mean with "reference"?

[Magallo]

What is the first paramater called 'reference'? What is it used for? Could you possibly explain that please?

[chrberger]

This input is the origin and used as outlined below:Convert a given WGS84 position to a Cartesian position using a given WGS84 reference position with Mercator projection: std::array<double, 2> cartesianPosition = wgs84::toCartesian({52.247041, 10.575830} /* reference position /, {52.248091, 10.57417} / position to be converted /));On 26 Jun 2023, at 09:58, Magallo @.**> wrote: What is the first paramater called 'reference'? What is it used for? Could you possibly explain that please?

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[Magallo]

I continue not to understand. What an origin is used for? I expected only one coordinate in WGS84 as input and a coordinte in cartesian as output.