USAboundaries 0.3.1

• New vignette demonstrating the package's functionality (#40).
• Additions and clarifications to documentation following @andysouth's suggestions for JOSS peer review (#38).
• us_cities() now returns an sf object rather than a data frame (#36).
• us_cities() gains a states argument to match other functions in the package (#35).
• Citation to JOSS paper.

USAboundaries 0.3.0

• Moved most data to USAboundariesData. This improves loading time and permits more frequent updates to the user-facing package.
• Added state plane projections table and functions (@jfbratt). Now users can get an appropriate projection for a state.
• Converted all boundary objects to sf objects.
• Updated all contemporary census boundaries from the 2014 to the 2016 versions.
• Added zipcode tabulation area centroids.
• Added historical city populations compiled by Erik Steiner at CESTA/Stanford University.

USAboundaries 0.2.0

• Added contemporary boundaries for states, counties, and congressional districts.
• Import many fewer packages. The us_boundaries() function no longer has an option to return a fortified data frame. It is assumed that users will convert the SpatialPolygonsDataFrame objects to whatever format they need.
• High resolution data is now available in the USAboundariesData package.

v0.1

USAboundaries 0.1

• Initial release
• us_boundaries() returns an sp object or a data frame which can be
  plotted.