Example for GeoMakie / Orthodromic vs Loxodromic navigation

[scls19fr]

Hello,

After following discussion on https://discourse.julialang.org/t/geodesy-how-to-calculate-the-straight-line-distance-between-two-locations-which-is-represented-by-longitude-and-latitude/19984/10 I have just found this project that I missed on https://discourse.julialang.org/search?q=geomakie.

So thanks for building GeoMakie! It seems to be a great project!

Maybe you should create a specific post on Julia discourse to present this project and add link to it from https://discourse.julialang.org/t/plotting-data-on-a-map-in-julia/4655 post.

I also think that creating a Jupyter notebook showing difference between orthodromic navigation (aka great-circle navigation) navigation and loxodromic navigation using GeoMakie could be a nice example to have.

http://ressources.univ-lemans.fr/AccesLibre/UM/Pedago/physique/02/divers/ortholoxo.html provide such an example.

Be also aware that a lot of maps can be found at https://www.sciencespo.fr/cartographie/khartis/docs/les-fonds-de-carte-disponibles/index.html https://github.com/AtelierCartographie/Khartis/tree/master/public/data/map

Kind regards

[asinghvi17]

I could probably whip one up. Is loxodromic navigation just a straight line in lon/lat coordinates?

[scls19fr]

loxodromic navigation is "straight line" but I prefer to say a constant bearing move because it's not really a line (because of roundness of Earth) whereas orthodromic navigation is navigation following a great circle (ie a circle passing by center of earth and 2 points)

loxodromic navigation is a straight line using Mercator projection (or any other conformal_map)