Create a geom_sf() or sf_transform() argument to rotate a map?

[brooke-l-hawkins-noaa]

I'm creating maps of the US West Coast and California, and want an easy way in R to rotate the map to better feature the coastline.

• I expected to find an easy sf::sf_transform() argument, or ggplot::geom_sf() argument that would take care of it, and didn't.
• I checked the sf documentation, and I calculated the rotation with rot = function(a) matrix(c(cos(a), sin(a), -sin(a), cos(a)), 2, 2), but that seemed like it would be easy to mess up when plotting multiple layers together that need the same rotation.
• I ended up asking a colleague for shape files with rotated coordinate reference systems from ArcGIS as a workaround. Which works, but feels a bit clunky still too, since the whole plotting workflow isn't in R.

It's my first time contributing an issue in this project, let me know if you need more details!

[edzer]

I would suggest to figure out which projection you want to use, and project your data to that; this could be specified in some way that st_transform() understands. What is the projection of the final map in ArcGIS?