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The Geographic Support System Initiative will integrate improved address coverage, spatial feature updates, and enhanced quality assessment and measurement.
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The U.S. Census Bureau conducts the Boundary and Annexation
Survey (BAS) annually to collect information about selected legally defined
geographic areas. The BAS is used to update information about the legal
boundaries and names of governmental units in the
The file naming
convention for AIAs is as follows: BAS12R4<st><tribal code><tribal
where <st> represents the two digit state code, <tribal code> represents the four digit tribal code, <tribal area code> represents the four digit tribal area code, and <xxx> represents the mapsheet number. An example of an AIA file name is: BAS12R49900090495_001.pdf.
The file naming convention for Consolidated Cities is as follows: BAS12CC0<st>000<yyyyy>_<xxx>.pdf,
where <st> represents the two digit state code, <yyyyy> represents the five digit Consolidated city fips code, and <xxx> represents the mapsheet number. An example of a Consolidated City file name is: BAS12CC00900047500_003.pdf
The file naming convention for
Counties is as follows: BAS12C2<st><cou>00000_<xxx>.pdf,
where <st> represents the two digit state code, <cou> represents the three digit county code, and <xxx> represents the mapsheet number. An example of a County file name is: BAS12C2020200000_001.pdf
The file naming convention for
Incorporated Places is as follows: BAS12P1<st>000<place>_<xxx>.pdf,
where <st> represents the two digit state code, <place> represents the five digit place code, and <xxx> represents the mapsheet number. An example of an Incorporated Place file name is: BAS12P10600000947_001.pdf
The file naming convention for HHLs
is as follows: BAS12R4<st><yyyy><zzzz>_<xxx>.pdf,
where <st> represents the two digit state code, <yyyy> represents the four digit HHL state office code, <zzzz> represents the four digit HHL code, and <xxx> represents the mapsheet number. An example of a HHL file name is: BAS12R49903035026_001.pdf
The file naming convention for MCDs
is as follows: BAS12M3<st><cou><MCDcd>_<xxx>.pdf,
where <st> represents the two digit state code, <cou> represents the three digit county code, <MCDcd> represents the five digit MCD code, and <xxx> represents the mapsheet number. An example of a MCD file name is: BAS12M31700123412_001.pdf
The BAS entities are displayed on three different types of mapsheets: Index, Inset, and Parent. Index sheets show the entire entity boundary for entities that are too large to be printed on one single mapsheet. In addition, index mapsheets also show the total number of mapsheets for that particular entity, and any inset sheets in an entity. Index maps are assigned a mapsheet number of ‘000’. Inset mapsheets show a larger view for areas that are too small to view in the standard parent mapsheet. An example of an inset mapsheet number is ‘A01’. Parent mapsheets show a portion of an entity boundary, or the entire entity boundary for those entities that are small enough to be printed on one single mapsheet. An example of a parent mapsheet number is ‘003’.
NOTE: Some of the maps are very large in size and downloading time for these maps will vary depending on your internet access speed.