Archive of Census Related Products (ACRP)

Download

The boundary files contain census geographic entities extracted from the TIGER/Line Files, 1992. These data have been processed to create the following:

• State boundary files for county, county subdivision (mcd), place, 1990 tract/block numbering area, blockgroup, and 1980 tract and mcd's (where available). The tract and blockgroup files are grouped by MSA (Metropolitan Statistical Area) and CMSA (Consolidated Metropolitan Statistical Area).

directory path: /pub/census/usa/tiger/xx (where xx represents the state postal codes).

• County boundary files for all census blocks. Each census block is identified by a unique POLygon IDentification (POLID) field which matches the POLID in the STF data.

directory path: /pub/census/usa/tiger/xx/bnablk (where xx represents the state postal codes).

Example data for the state of Massachusetts:

"250010000.00099A","099A","250010000.00099A","blk",4 
-70.023632, 41.788184 -70.023462, 41.788020 
-70.023533, 41.788223 
-70.023632, 41.788184 "250010000.00099B","099B","250010000.00099B","blk",93 
-70.603506, 41.511693 -70.592881, 41.511135 -70.560285, 41.509219

Spatial Coverage

United States

Format

Boundary ASCII Format (BNA); The BNA file format can be directly imported into ATLAS GIS (SMI). It can also be converted for other desktop packages, like MAPINFO, ARC/INFO, SAS, etc.

Code

Several format conversion programs (code) reside in /pub/census/.support/. These include:

• atlsbna.sas - converts SAS Gmap dataset to Atlas BNA format
• bna2sas.sas - converts BNA files to SAS Gmap format
• bna2mif.c - converts BNA files to MapInfo format
• cnty2met.sas - converts county code to metro code
• cnvtdlm.sas - converts SAS dataset to sequential file in delimited format
• latlonm - converts x-y coordinates from latitude, longitude to miles
• mlatlon - converts x-y coordinates from miles to latitude, longitude