Missouri Census Data Center

MABLE/Geocorr12: Geographic Correspondence Engine

With Census 2010 (and later) Geography

Version 1.2, 2012

To access a version of this application that works with the old 2000 geography go to geocorr2k.html.

Links:  Cure for Common Codes (related app)    |    What's new in Geocorr12    |    geocorr12 Examples (html-based)

2k version tutorials:   ppt    |    geocorr2k examples (video-based)

Original help file from 1996 (still the best source for explaining how it works)

This form has 5 sections but only the first 2 are required:   Input | Output | Geographic Filter | Point & Distance | Bounding Box

Input Options

Select the state (or states) to process.

For background info re the Source/Target geocodes used in this application see the Master Area Geographic Glossary Of Terms -- MAGGOT file.

All geocodes are as of 2010 unless otherwise specified.
Select 1 or more "SOURCE" Geocode(s) Select 1 or more "TARGET" Geocode(s)
Notes:
+ If you chose census block then you may not choose more than 10 states.
* If you chose "Concentric Ring Pseudo-Geocode" from either list (above) then you must specify the "Point and Distance" or "Ring Geocode" options below.
Weighting Variable:
Specify the variable to use for determining the portion of the source geocodes corresponding to the target geocodes:

Note: Do NOT use the 2012 estimate as weighting variable when working with small (sub-county) geographic areas. The 2012 estimate for each block is just the pop2010 value multiplied by a county-based change-in-pop factor. .
Ignore Census Blocks with a value of 0 for the weighting variable.


Output Options


Have weighted centroids calculated and kept on the output file(s)

Generate 2nd allocation factor (AFACT2): portion of target geocodes in source geocodes

Sort by target geocodes, then source geocodes (default is by source, then target)

You have your choice of 2 output formats: a comma-separated-value (".csv") file and/or a report format ("listing") file. For each file you can specify whether you want just the geographic codes, or the codes and the names associated with them (where applicable), or just the names.

Comma Separated Value File Listing File
Generate a CSV file    Use tabs as delimiter Generate a listing file    Format:
(Optional) Title for output report:


  Processing time for large areas may be several minutes.

Geographic Filtering Options

NOTE: This section allows you to specify options that will limit the geographic universe to be processed. If you just want to process the entire state(s) that you have selected then you can ignore this section.
You can specify any or all of 4 types of geography to limit the universe to be processed. You may, for example, only want to see a file with geography for a set of counties, or for a specific metro area (or areas), or possibly for a city (place). You can do so by entering the appropriate FIPS (Federal Information Processing Standard) codes in the text entry boxes that follow. If you need to look up the codes you can click on the links to the code-list files in each section (the section headers are also the links) or use the Cure for the Common Codes web app.

By default, if you specify more than one kind of geography here then the application assumes that you want to "and" the selections, keeping only areas that satisfy all criteria. For example, if you specified three counties and a metro area, you would only get data based on blocks that were in both the counties and the metro area (i.e. the intersection of the selected areas.) To override this default and choose geographies that satisfy any (rather than all) of your select criteria -- click here:

All selections made below are in addition to the state-level or distance-based filtering which you specify

County codes . Enter 5-digit FIPS county codes with leading zeroes separated by blanks. You may enter 3-digit codes if you selected only one state. Your output will be limited to the counties specified.
Examples:

  • 29189 29510 17163 17119 (selects 4 counties in 2 states)
  • 005 017 049 (selects 3 counties from the single state selected)

Metro Area ("CBSA") codes.

Enter 5-digit Core-Based Statistical Area codes here to filter based on the Metropolitan/Micropolitan statistical areas. You can use the special value -99999 to select only those places which are outside any metro or micropolitan area.

Note that we no longer support filtering using the old (vintage 2000) 4-digit MSA/CMSA/PMSA codes.

Examples:
  • 27620 42740 (Selects the Jefferson City Metropolitan and Sedalia Micropolitan Statistical Areas (MO)
  • -99999 (Selects all geographic areas that are NOT within a CBSA).


Place codes. Enter 7-digit FIPS place codes with leading zeroes separated by blanks. You can enter 5-digit codes if only one state has been selected. Your output will be limited to the official city limits of these cities as of the 2010 census.
Enter a value of -99999 to indicate that you want to exclude all areas that are not inside any place. You will get all areas that are unincorporated and not within a Census Designated Place.
Examples:

  • 70520 70545 70550 53780 06020
    (Saginaw City, Saginaw Township North and South, Midland, Bay City, MI)
  • -99999
    You will get output that excludes any geographic area not included within a place.


Point and Distance Options

Specify a point (location) and distance to be used as filter:
Value for radius of Circle or radius of largest Ring: (In miles, unless you check here to specify kilometers.)
See just below for links to help find coordinates. If you just want to do a test you can enter the values 38.7070 & 90.3127 which are the coordinates of UMSL in St Louis county, MO.
Coordinates of Point:     degrees latitude,     degrees longitude.
Label of Point:   (optional)
Define Ring criteria (if Concentric ring geocode selected above) specifying only one of the following two options:
  1. # of equi-distant rings (integer value 1 to 10). Radius specified above will be divided by this to derive width of each Ring.
    -OR-
  2. Specify your own custom list of up to 10 ring radii values in ascending order (values must be greater than zero, may be fractional, and largest should equal the radius of the Circle specified above):
    #1 #2 #3 #4 #5 #6 #7 #8 #9 #10
Note: A ring is identified on output files by its outer radius. E.g., a ring of 4 to 8 miles will have code 8.

Links are provided here to facilitate obtaining coordinates for your location. (Click to use google maps to specify Lat/Long or see Usage Notes for links to web sites where you can enter an address and get its latitude-longitude coordinates.) Note: If you specify a lat-long location the variable "distance" will be added to your output. This requires that weighted centroids also be calculated (set automatically). The "distance" variable will be between the weighted centroid and the specified Point. If you specify Ring Pseudo-Geocodes then distance and weighted centroid values will not be calculated or stored (because weighted centroids of donuts are misleading).


Bounding Box Filter Options

If you want to limit processing to blocks with center points that fall in a specified rectangular area you can enter the coordinates for such a "bounding box" here.

Define the "bounding box" coordinates in decimal degrees:
Northern-most Latitude
Southern-most Latitude
Western-most Longitude
Eastern-most Longitude



Internal use only (ignore):


Please direct all questions and comments to John Blodgett at OSEDA.