Hi @robertk,

According to Stack Overflow (https://stackoverflow.com/questions/1185408/converting-from-longitude-latitude-to-cartesian-coordinates), the formula for calculating the spherical lat, long from what appears to be geocentric coordinates would be:

latitude = asin(Z / Radius)

longitude = atan2(Y, X)

However this formula is dependent on these condition:

• the x-axis goes through long,lat (0,0), so longitude 0 meets the equator;
• the y-axis goes through (0,90);
• and the z-axis goes through the poles.

This formula gives us latitude -27.26644670517016, longitude 2.858518396400994, which is quite different from your target lat/long, so it appears that those coordinates are not geocentric.

Are you able to provide any information on the source of the coordinates?

I know Global Mapper comes with a number of ellipsoids for celestial bodies (moon, all major planets, a few dwarf planets and moons). If I understand this correctly that's all you need really.

You could hack your own of course and import them into FME.

Hello! @DaveAtSafe

Thanks for your reply!

I am on a verge of giving up because a lot of time has passed and still no real headway. Its for bonus points but I think its just too hard.

I have read that article and tried to make a C program but it failed. I usually try to exhaust all options I can find before asking. Learned a lot that way but still no closer in solving this...

Also I believe coordinates have Haversine component.

This is a software at university which is closed source. Software is used to do a lot of space calculations for Solar system but it has some addons for others. It is basically a simulator for other worlds and small bodies. Some are real (our system) and most are semi (what is known) and many are not real for practice. Navigation (1st person "hovering") is done by using this format. We are tasked to try and make several waypoints by reading XYZ and then convert them to decimal for easier navigation since every other body will be different and reading XYZ is not really good.

There are several coordinates like this one on the same body as well as few others for reference (solved) to help with the possible solutions for this and eventually some other body with different radius.

Here is another one: Radius: 2503km, EMasses: 0.0503

X: -2405525.88 Y: 490527.71 Z: 483042.96 == Latitude(Y): 11.2058, Longitude(Z): 168.5456

Also I must point out that I saw in UI something that is called "RelativePosition". Then values are (from above): X: -240.5525, Y: 490.527, Z: 483.042

Could it have something with radians? This is a snippet of small program I wrote for known coordinates for calculating area size on particular body. It yields precise results.

#define ONEDEGREEINRADIANS 0.0174532925

double degToRad(double degrees);

int main()
{

double interval, radius, latitude, instance;

// bunch asking for coords and some math stuff

interval = 360 / ((cos(degToRad(latitude)) * (radius * 2 * PI)) / instance);

}

double degToRad(double degrees)

{
return ONEDEGREEINRADIANS * degrees;
}

Thanks.

latitude = @Evaluate(@asin(@Value(z)/@Value(r))*(180/@pi())) longitude = @Evaluate(@atan2(@Value(y),@Value(x))*(180/@pi()))