st99_d00: US State Boundary Data and Information

In SeerMapper: A Quick Way to Map U.S. Rates and Data of U.S. States, Counties, Census Tracts, or Seer Registries using 2000 and 2010 U.S. Census Boundaries

Description

US State and Territory Boundary datasets from the 2000 or 2010 census for use with the Seer Mapper packages (SeerMapper and the SatScan Mapping Program.

Usage

data(st99_d00)

Format

SpatialPolygons class of object. Keyed on the State FIPs code. Each list element is a "polygons" class object contains a list of "Polygons" class objects describing the state boundaries and several attributes: Boundary Box, Label Point, Area, and ID.

Details

  The state FIPS code are:
      01 - Alabama
      02 - Alaska
      04 - Arkansas
      06 - California
      08 - Colorado
      09 - Connecticut
      10 - Delaware
      11 - District of Columbia
      12 - Florida
      13 - Georgia
      15 - Hawaii
      16 - Idaho
      17 - Illinois
      18 - Indiana
      19 - Iowa
      20 - Kansas
      21 - Kentucky
      22 - Louisiana
      23 - Maine
      24 - Maryland
      25 - Massachusetts
      26 - Michigan
      27 - Minnesota
      28 - Mississippi
      29 - Missouri
      30 - Montana
      31 - Nebraska
      32 - Nevada
      33 - New Hampshire
      34 - New Jersey
      35 - New Mexico
      36 - New York
      37 - North Carolina
      38 - North Dakota
      39 - Ohio
      40 - Oklahoma
      41 - Oregon
      42 - Pennsylvania
      44 - Rhode Island
      45 - South Carolina
      46 - South Dakota
      47 - Tennessee
      48 - Texas
      49 - Utah
      50 - Vermont
      51 - Virginia
      53 - Washington 
      54 - West Virginia
      55 - Wisconsin
      56 - Wyoming
      72 - Puerto Rico
    

As of Version 1.0 of SeerMapper package, the .rda files are compressed using the "xz" method to reduce the disk space requirements.

The SeerMapper package contains the state boundary files from the U. S. 2000 Census state boundary data. Since the U. S. 2000 state boundaries are very similar to the U. S. 2010 state boundaries, the U. S. 2000 state boundaries are used for mapping data for both census years.

The censusYear call parameter or using the SeerMapper2010 function call informs the package which census year boundaries to use during the mapping. In the case of the state boundaries, they are the same. Three states changed counties and have additional 2010 counties boundary files. Most of the change was with the tract boundaries, so there are two set of three supplemental packages containing the tract boundaries for each state.

The state, county and tract boundary shape file data was downloaded from the U. S. census website on July 3, 2016. The shapefiles were uploaded to the "www.MapShaper.org" website and using the modified Visvalingam method with intersection repair enabled, prevent shape removal enabled, and coordinate precision set to 0.0, the boundaries were simplified from 100 the original. This reduced the space requirements by 90 The shapefiles were downloaded and converted to SpatialPolygons structures and saved as one county dataset per state, one tract dataset per state and census year and the state boundary set (st99_d00). The coordinates started as lat/long values and have been transformed to a cartisian coordinates system based on proj4 string "+proj=eqdc +lat_1=33 +lat_2=49 +lat_0=39 +lon_0=96w +units=m" for mapping. All boundary data used by the SeerMapper package is pre-transformed to this project for better visualization and to reduce the time required to build each map.

The st99_d00 is used to support both census years (2000 and 2010). It contains the information to identify the three states that had county boundary changes and triggers the program to use different county boundary files when mapping census year 2010.

The boundary spatial data

The @data structure of the saved st99_d00 SpatialPolygonsDataFrame contains the following information for use by the SeerMapper function:

row.names

the row.names of the SPDF are the 2 digit state FIPS codes.

ID

the state 2 digit FIPS code.

stID

the state 2 digit FIPS code.

abbr

= A character vector of the 2 letter state abbreviation.

stName

= A character vector of the state full name.

rgID

= a value representing the U. S. census region containing the state.

rgName

= A character vector of the name of the region containing the state.

dvID

= An integer representing the U. S. census regional division containing the state.

dvName

= A character vector of the name of the regional division containing the state.

loc

= A character vector of the last part of the name of the supplemental package containing the census tract boundary data for this state.

DoAdj

= a value indicating if adjustments are required to the original shapefile boundary data. (e.g. moveX, moveY, scale) (Not used by SeerMapper.)

moveX

= A numeric value of the number of degrees latitude the centroid of the state was moved to create the boundary data for this state. (Not used by SeerMapper.)

moveY

= A numeric value of the number of degrees longitude the centroid of the state was moved to create the boundary data for this state. (Not used by SeerMapper.)

scale

= A numeric value represntating the scaling factor used on the original shapefile data to create the boundary data in this dataset. The value of 1 indicates no scaling change. (Not used by SeerMapper.)

proj

= A character vector representing the proj4 values of the boundary data projection. All boundaries are transformed to an equal area projection for the mapping. (Not used by SeerMapper.)

county00

= An integer value of the number of counties in the state during the 2000 census year.

county10

= An integer value of the number of counties in the state during the 2010 census year.

tracts00

= An integer value of the number of 2000 census tracts contained in the state.

tracts10

= An integer value of the number of 2010 census tracts contained in the state.

change10

= A logical value (T/F) indicateing (if TRUE), the states had county boundary changes in the U. S. 2010 Census. If TRUE, the backages uses the coXX_d10 datasets for the states instead of the standard cXX_d00 datasets for the county boundaries in the state for mapping.

c_X

= A numeric value of the X coordinate of the centroid of the state.

c_Y

= A numeric value of the Y coordinate of the centroid of the state.

To ensure the boundary datas correctly align when census tracts are mapped within counties and counties within states, the state boundaries based on their census tract boundaries data. The state census tract data was imported from the U. S. census website and uploaded into URL:www.mapshaper.org and reduced as stated above to 10 The resulting shapefile for tracts in a state are saved as the census tract baseline shapefile for the state. The census tract boundaries are joined together into counties to create the state's county boundary dataset. The county boundaries are then joined together to create the state boundary and added to this state boundary dataset.

Source

The US State boundary SpatialPolygon structures are generated by collapsing the census tract bountaries from the U. S. Census website urlhttp://www.census.gov/geo/maps-data/data/cbf/cbf_tracts.html for the appropriate census year - 2000 or 2010. The shapefiles were downloaded on July 3, 2016.

Examples

  data(st99_d00)

Example output

SeerMapper documentation built on Jan. 15, 2021, 3:16 p.m.