Cartographic Products Management Branch
20030411
107th Congressional Districts, Illinois
vector digital data
http://www.census.gov/geo/www/cob/cd107.html
Congressional districts (CDs) are the 435 areas from which people are elected to the U.S. House of Representatives. After the appointment of congressional seats among the states, based on census population counts, each state is responsible for establishing CDs for the purpose of electing representatives. Each CD is to be as equal in population to all other CDs in the state as practicable.
The cartographic boundary files are a generalized extract from the U.S. Census Bureau's TIGER database. Line simplification/smoothing was performed with a tolerance of 0.005 decimal degrees and a coordinate reduction using the Douglas-Peucker method with a tolerance of 0.0003 decimal degress. Very small polygons were eliminated when the combination of geographic codes existed elsewhere. The geography was clipped back to the shoreline of the United States, in contrast to TIGER/Line which shows the full extent of geography out to the 3-mile limit.
These generalized cartographic boundary files are originally produced to support the spatial geographic infrastructure for certain mapping functions within the Census Bureau's American Fact Finder and in support of the LandView Geographic Data Viewer. The generalized files have a much smaller file size than the original file extraction from the Census Bureau's TIGER database, resulting in faster download and processing times.
20010101
20030101
publication date
As needed
-91.512817
-87.495491
42.508301
36.970249
ISO 19115 Topic Categories
boundaries
None
Cartographic
Boundary
generalized
government
boundaries
congressional
districts
107
census
107th
FGDC Framework Themes
FWGOVERNMENTALUNITS
None
United States
State
Illinois
17
None
The boundaries in this file are for statistical purposes only. They do not represent legal boundaries.
U.S. Census Bureau, Geography Division,
Geographic Products Management Branch
mailing
4700 Silver Hill Road, Stop 7400
Washington
DC
20233-7400
US
physical
8903 Presidential Parkway, Room 520 WP1
Upper Marlboro
Maryland
20772
US
301-763-1128
301.457.4710
tiger@census.gov
7am - 5pm EST
http://www.census.gov/geo/www/maps/CP_Contact.htm
20030514
U.S. Census Bureau, Geography Division,
Cartographic Products Management Branch
Cartographic Products Management Branch Metadata Coordinator
mailing
4700 Silver Hill Road, Stop 7400
Washington
DC
20233-7400
US
physical
8903 Presidential Parkway, Room 301 WP1
Upper Marlboro
Maryland
20772
US
301-763-1101
301-457-4710
zachariah.meade.turner.iii@census.gov
7am - 5pm EST
http://www.census.gov/geo/www/maps/CP_Contact.htm
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998