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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