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Showing content from https://github.com/pdil/usmap/issues/13 below:

add these projection details to Intro/Vignette PDF · Issue #13 · pdil/usmap · GitHub

usmap/data-raw/maps/create-map-df.R

Line 32 in b3d285e

us_aea <- spTransform(us, CRS("+proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +a=6370997 +b=6370997 +units=m +no_defs"))

This is an important piece of projection info that will let others use other dataframes, for instance, having unprojected geographic data (i.e., lat/long coordinates) transform to the right spatial projection. I would include this in the intro/vignette part where you describe which projection is used (i.e., page 17 of https://cran.r-project.org/web/packages/usmap/usmap.pdf).


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