MABLE/Geocorr90 Geographic Correspondence Engine

Version 3.03a With 1990 Census Geography

See the geocorr_index page for links to other versions of this application with more current geography.

Geocorr90 is [was] mirrored at SEDAC/Ciesin
This application accesses the MABLE98 geographic data base to generate custom "correlation lists" as reports and/or files.

Help   |   Examples   |   Usage Notes   |  

Select 1 or more state(s) to process. (Required)

For background information re any of the geographic codes used in the MABLE database (source/target geocodes) see the
MAGGOT  (Master Area Geographic Glossary Of Terms) file.
Select "SOURCE" Geocode(s) Select "TARGET" Geocode(s)
* If you chose "Concentric Ring Pseudo-Geocode" from either list (above) then you must specify the "Point and Distance" or "Ring Geocode" options below.
** The 95 MSA and PMSA codes are not available in New England. NECMA95 codes are available only for New England.
*** Hydrologic Unit Codes are normally 8 digits, but you can specify keeping only the first 2, 4 or 6 (region, subregion and accounting units). These codes not available for Alaska and Hawaii.

Weighting Variable:
Specify the weighting variable to use for determining the portion of the source geocodes corresponding to the target geocodes:
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 (".lst") 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 Generate a listing file
Use tabs (not commas) as delimiter

Process time for large areas may be several minutes.

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.)
Coordinates of Point:     degrees latitude,     degrees longitude.
Label of Point:   (optional)
Define Ring criteria specifying only one of the following two options:
Either: # of equi-distant rings (integer value between 1 and 10). Radius specified above will be divided by this to derive width of each Ring.
Or: 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: 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 Option

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" next.

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

Process time for large areas may be several minutes.

NOTE: The rest of this form 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 the rest of this form and submit your request now.

Geographic Filtering Options

You can specify any or all of 3 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.

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 specified above

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.

Metro Area codes. Enter 4-digit FIPS metro area codes with leading zeroes separated by blanks. MSA, CMSA and PMSA codes may be used (4-digit only). The 1990 definitions will be used. Your output will be limited to the metro areas specified. New England NECMA codes can not be used.

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 1990 census.

Process time for large areas may be several minutes.

Debug option