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The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation.
Metropolitan and Micropolitan Statistical Areas are together termed Core Based Statistical Areas (CBSAs) and are defined by the Office of Management and Budget (OMB) and consist of the county or counties or equivalent entities associated with at least one urban core (urbanized area or urban cluster) of at least 10,000 population, plus adjacent counties having a high degree of social and economic integration with the core as measured through commuting ties with the counties containing the core. Categories of CBSAs are: Metropolitan Statistical Areas, based on urbanized areas of 50,000 or more population; and Micropolitan Statistical Areas, based on urban clusters of at least 10,000 population but less than 50,000 population.
Fields (https://www2.census.gov/geo/pdfs/maps-data/data/tiger/tgrshp2013/TGRSHP2013_TechDoc_A.pdf, p. A-85)
Field
|
Length
|
Type
|
Description
|
CSAFP
|
3
|
String
|
Current combined statistical area code, if applicable
|
CBSAFP
|
5
|
String
|
Current metropolitan statistical area/micropolitan statistical area code
|
GEOID
|
5
|
String
|
Metropolitan statistical area/micropolitan statistical area identifier, metropolitan statistical area/micropolitan statistical area code
|
NAME
|
100
|
String
|
Current metropolitan statistical area/micropolitan statistical area name
|
NAMELSAD
|
100
|
String
|
Current name and the translated legal/statistical area description for metropolitan statistical area/micropolitan statistical area
|
LSAD
|
2
|
String
|
Current legal/statistical area description code for metropolitan statistical area/micropolitan statistical area
|
MEMI
|
1
|
String
|
Current metropolitan/micropolitan status indicator
|
MTFCC
|
5 |
String |
MAF/TIGER feature class code (G3110) |
ALAND
|
14
|
Number
|
Current land area
|
AWATER
|
14 |
Number |
Current water area
|
INTPTLAT
|
11
|
String
|
Current latitude of the internal point
|
INTPTLON
|
12 |
String |
Current longitude of the internal point
|
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