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#' Tools, Shapefiles & Data to Work with an 'AlbersUSA' Composite Projection
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#'
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#' Creating a composite projection for states and counties of the United States
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#' that includes scaled and shifted polygons for Alaska and Hawaii is time consuming
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#' and potentially error-prone. Functions and data sets are provided to make it easier to
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#' produce maps with a composite projection. Furthermore, named projections for common
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#' transormations are provided to further increase mapping productivity.
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#'
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#' Newer \code{sf} (simple features) objects can be returned or legacy R
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#' spatial \code{sp} objects can be returned.
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#'
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#' Reference GeoJSON files are provided in the following locations (i.e. you can use
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#' them in any mapping program):
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#'
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#' \preformatted{
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#' system.file("extdata/composite_us_states.geojson.gz", package="albersusa")
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#' system.file("extdata/composite_us_counties.geojson.gz", package="albersusa")
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#' }
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#'
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#' @name albersusa
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#' @docType package
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#' @author Bob Rudis (bob@@rud.is)
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#' @import sp rgeos rgdal maptools
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#' @import sf
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NULL
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