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Illinois Enacted Redistricting Shapefiles & Geospatial Analysis
Enacted boundary files are obtained from individual states and are in the public domain. In early 2013, the Census Bureau plans to release an official set of these boundary files. The purpose of our process is to provide early access to these boundary files (shapefiles) to facilitate their use between now and mid 2013.
See the ERS Main Section for a list of other state ERS resources.
Using the Shapefiles. The shapefiles are in decimal degrees and geographic; no projection. They may be used with any software that can process shapefiles. Applications are supported by the ProximityOne CommunityViewer GIS software (CV -- http://proximityone.com/cv.htm). CV is a general purpose GIS software used for reference and pattern analysis applications. CV was used in the Census 2010 LUCA program to facilitate improvement in coverage and accuracy of the Census 2010 TIGER/Line files. CV is used to organize multiple related shapefiles into a GIS project. Map views developed with CV using ERS data create a projected view in a Mercator projection which works well throughout the U.S.
To use the GIS project and shapefiles on your computer, proceed with the three following steps. Once the software and project files are installed, you can repeatedly open, view, analyze by just using step 3.
1. Install the No-Fee Version of CommunityViewer (CV) GIS
Use the no-fee version of CV to view/examine/analyze boundaries and patterns.
Run CV Installer -- http://proximityone.com/tracts/cvinstaller.exe (Windows 32/64 OS).
Learn more about CommunityViewer GIS at http://proximityone.com/cv.htm.
Please register here (optional) to receive information on updates ... check "Registering Installation ...".
This step is only performed once. Other state projects and shapefiles work with the installed CV software.
2. Expand the Illinois State GIS Project Fileset
Steps shown here are for the Illinois project/shapefiles.
Expand the project files http://proximityone.com/gis/1/il2011.zip to new folder c:\gis\1
3. Viewing the Geography/Shapefiles and Geospatial Analysis
With CV installed and the GIS Project Fileset expanded, start CV (desktop icon)
Use File>Open and open the Illinois project c:\gis\1\il2011.gpr. Start-up view appears as shown below.
See CommunityViewer user information at http://proximityone.com/cv.htm.
Illinois GIS Project and Shapefile Structure and Use
The following views and narrative describe/illustrate how the Illinois congressional district and state and house district boundary files can be used with GIS software to visually examine maps and district geography/characteristics of interest.
Congressional District Boundaries
The following graphic shows the Illinois 2011 enacted congressional districts (green bold semi-transparent boundary with labels) and 111/112th congressional district boundaries (black boundary with yellow labels). County boundaries are shown with gray semi-transparent boundary. The Illinois 2011 enacted shapefile became available June 2011. All 2010 shapefile boundaries have been trimmed at shoreline. Start-up view of GIS project.
Ohio State and House Boundaries
IL House 2010 (black) and enacted (red semi-transparent)
IL Senate 2010 (black) and enacted (blue semi-transparent)
See the Main ERS Section examples illustrating:
- addition of other layers/shapefiles including roads, ZIP codes and census blocks.
- drill-down to census block and intersection level of detail.
More About the Illinois GIS Project
View the above maps on your computer. Zoom in to view specific districts of interest and more. Check/uncheck layers to view only the boundaries of interest.
Scope of GIS Project
The GIS project fileset includes these shapefiles:
Illinois 111th/112th Congressional Districts (Census Bureau Census 2010)
Illinois 2011 Enacted Congressional Districts (Illinois Board of Elections)
Illinois 2010 vintage Senate districts (Census Bureau Census 2010)
Illinois 2010 vintage House districts (Census Bureau Census 2010)
Illinois 2011 Enacted Senate districts (Illinois Board of Elections)
Illinois 2011 Enacted House districts (Illinois Board of Elections)
Integrating subject matter and making thematic pattern maps.
Viewing city/place layers.
Viewing ZIP code layers.
Proximity develops geodemographic-economic data and analytical tools and helps organizations knit together and use diverse data in a decision-making and analytical framework. We develop custom demographic/economic estimates and projections, develop geographic and geocoded address files, and assist with impact and geospatial analyses. Wide-ranging organizations use our tools (software, data, methodologies) to analyze their own data integrated with other data. Contact Proximity (888-364-7656) with questions about data covered in this section or to discuss custom estimates, projections or analyses for your areas of interest.