# SatelliteToolbox.jl can now read lots of gravity models! And everything is validated :)

**URL:** <https://discourse.julialang.org/t/satellitetoolbox-jl-can-now-read-lots-of-gravity-models-and-everything-is-validated/11723>\
**Category:** Astro/Space\
**Created:** [June 16, 2018, 8:08pm UTC](https://discourse.julialang.org/t/satellitetoolbox-jl-can-now-read-lots-of-gravity-models-and-everything-is-validated/11723 "2018-06-16T20:08:38Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![stephancb](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stephancb/32/14243_2.png) [@stephancb](https://discourse.julialang.org/u/stephancb)\
**Post date:** [June 18, 2018, 11:36am UTC](https://discourse.julialang.org/t/satellitetoolbox-jl-can-now-read-lots-of-gravity-models-and-everything-is-validated/11723/11 "2018-06-18T11:36:52Z")

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Good argument, a package for each model would have advantages, I think. With the [Queryverse](https://github.com/davidanthoff/Queryverse.jl) as the role model, metapackages like Geophysics.jl would just pull all tools together, that a user wanting to do something in this field might need.

Important is perhaps that there is a good interface to Julia specific features. E.g. how can we iterate over the data that we use? I learned from [this nice tutorial](https://discourse.julialang.org/t/intro-to-the-queryverse-a-julia-data-science-stack-tutorial-this-thursday/11599) that all iterable named tuples can be fed into that system.

So if the SateliiteToolbox, GeopotentialModels … packages allow to convert data and models input/output into such data structrure, it would be great. Perhaps some standardization of names is important? For example, instead of `latitude` use

- `geocentric_latitude` as used in the gravity and magnetic field models;
- `geodetic_latitude` as used in mapping tools;
- `qdip_latitude` and `aacgm_latitude` for magnetic latitudes (indirect output of magnetic field models);

when creating named data structures (like named tuples) that go in and out of the packages. This is only an example. Not sure what really needs coordination, how and who.

I think that trying to get these things consistent and working seamlessly can deliver one of the main benefits that integrating all this in principle already existing software into a language like Julia has.

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