Make the GFC parser more generic about satellitetoolbox.jl

[ronisbr]

Excellent idea! This should be easy. In fact, I have one proposal. See if this is good:

1. parse_gfc will create a new structure called GFC probably with the header information stored in Dict.
2. Then we need another function to convert this raw data into gravitational coefficients.
3. The compute_u and compute_g function will use the coefficients, leading to a fast algorithm.

One question (the website is still down): the algorithm used to compute the gravitational force in other celestial bodies is precisely the same as the one we have now right? In this case, we can have a very general function to compute this.

[helgee]

One question (the website is still down): the algorithm used to compute the gravitational force in other celestial bodies is precisely the same as the one we have now right? In this case, we can have a very general function to compute this.

Yes 👍

When the website is back I will check what kind of differences can be expected.

[ronisbr]

Hi @helgee !

I found this specification for the GFC files:

http://icgem.gfz-potsdam.de/ICGEM-Format-2011.pdf

I will try to implement this. It should be a little difficult because it is also used for models that consider tides. Hence, if I do this, we will have a very generic system to compute gravitational forces!

[ronisbr]

Hi @helgee

This problem should be fixed in master now. You can parse your file (with FORTRAN numbers, and gravity_constant header instead of earth_gravity_constant) using:

G = create_gravity_models_coefs(parse_icgem(filename))

Then, you can use the coefficients in G to compute the gravity with the function compute_g.

Please, let me know if this works!