create_us_map

ea_crs

transform2D

transform_alaska

transform_hawaii

compute_centroids

alaska_bbox

hawaii_bbox

<code>create_us_map()</code> creates the modified shapefiles used by the
usmap package.
<code>ea_crs()</code> returns the US National Atlas Equal Area coordinate reference system
(CRS) used by this package and <code>usmap</code>.
<code>transform2D()</code> computes a two dimensional affine transformation matrix
for the provided rotation angle and scale factor.
<code>transform_alaska()</code> applies the appropriate transform for the Alaska polygons.
<code>transform_hawaii()</code> applies the appropriate transform for the Hawaii polygons.
<code>compute_centroids()</code> computes the modified centroids for each state or
county polygon using a center-of-mass technique on the largest polygon in
the region.
<code>alaska_bbox()</code> returns the bounding box of Alaska pre-transformation.
<code>hawaii_bbox()</code> returns the bounding box of Hawaii pre-transformation.

internal

Provides a container for data used by the 'usmap' package.
The data used by 'usmap' has been extracted into this package so that the
file size of the 'usmap' package can be reduced greatly. The data in this
package will be updated roughly once per year as new map data files are
provided by the US Census Bureau.

create_us_map: Internal map creation tools

Description

Usage

Arguments

References