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Description of 2012 District Information
County
County data was extracted from the District by County statistics for each plan generated by the District Builder Web Application. It is in MS Excel format and lists the population from each county in each district, the total population of each county in the district, and the percentage of the county's population in the district. This data is based on Census 2010 population counts.
Precincts
Precinct data was generated using a spatial query based on EDR's 2010 Precinct shapefile and the shapefiles of the adopted House, Senate, and Congressional plans generated by the District Builder software. The resulting dataset included many slivers, some of which were spatial errors and some of which were artifacts of the differences between Census boundaries and precinct boundaries. To filter out invalid shapes from the dataset, any shape that represented less than 0.01% of the entire precinct area was removed from the data. While some invalid slivers may yet remain in the data and some small valid shapes may have been wrongly removed, the data is overall cleaner as a result. The fields in this data set identify the county, precinct 2010 number, and percentage of precinct area in the district. Note that these are 2010 precincts and most counties have reprecincted for the 2012 election cycle.
Places
Place data was generated in a process similar to the precinct process using the 2010 Census municipal boundaries and the shapefiles of the adopted House, Senate, and Congressional plans generated by the District Builder software. The resulting data was filtered with a minimum percent area threshold of 1% and minimum population size of 10,000. The population listed for each place is the total place population. We did not attempt to estimate the percentage of population from each place that lives in each district.
ZIP Codes
ZIP Code data was generated using ESRI data and maps and the U.S. Postal Service to identify all 5 digit ZIP code areas within each district and associate each ZIP code with a city and county.
District Statistics
To provide additional information about the adopted plans, the comma separated files generated by the District Builder software that detail aggregated district statistics and district by county statistics have been included with these other data sets. These files are available for download from the Senate website in .zip format for each adopted plan with additional files generated by the District Builder software.
Last Revised: September 16, 2016
