SOURCE

This datalayer was produced from the post-census release of 1990 TIGER/Line files for the fourteen counties of Massachusetts. This datalayer includes the boundaries of all census blocks and can therefore be used in conjunction with Census Bureau data summarized at the census block level--the finest available resolution of census data.

The layer is named CENSUS1990TIGER_ARC.

Using ArcInfo Workstation, the Census Block data (in coverage format) were created by extracting from county TIGER files all linework, line attributes, and polygon attributes. The coverages were enhanced by dropping redundant data items, appending several demographic data items from the STF-1, STF-3a, and PL94-171 census data matrices, and creating an Arc/INFO ADD file for address-matching. Each polygon in the original county TIGER file was assigned a MassGIS town-ID code, ensuring that all of the original polygons appear within the Town TIGER Geography datalayer.

The layer's arc attribute table includes the following items:

Item Name		Description
BLK90L		TABULATION BLOCK NUMBER LEFT - 1990 CENSUS TIGER ITEM 'BLKL'
BLK90R		TABULATION BLOCK NUMBER RIGHT - 1990 CENSUS TIGER ITEM 'BLKR'
CFCC		CENSUS FEATURE CLASS CODE
CFCC1		CENSUS FEATURE CLASS CODE - MAJOR FEATURE TYPE; REDEFINED ITEM
CNT90LEFT		FIPS COUNTY CODE LEFT - 1990 CENSUS TIGER ITEM 'COL'
CNT90RGT		FIPS COUNTY CODE RIGHT - 1990 CENSUS TIGER ITEM 'COR'
CTBNA90L		CENSUS TRACT/BNA CODE LEFT - 1990 CENSUS TIGER ITEM CTBNAL
CTBNA90R		CENSUS TRACT/BNA CODE RIGHT - 1990 CENSUS TIGER ITEM 'CTBNAR'
FDPRE		FEATURE DIRECTION PREFIX; TIGER ITEM 'DIRPRE'
FDSUF		FEATURE DIRECTION SUFFIX; TIGER ITEM 'DIRSUF'
FMCDCCD90L		FIPS 55 CODE LEFT (MDC/CCD) - 1990 CENSUS TIGER ITEM 'FMCDL'
FCDCCD90R		FIPS 55 CODE RIGHT (MDC/CCD) - 1990 CENSUS TIGER ITEM 'FMCDR'
FNAME		FEATURE NAME; TIGER ITEM 'FEANME'
FPLACO90L		PLACE CENSUS CODE LEFT; TIGER ITEM 'PLCDEL'
FPLACO90R		PLACE CENSUS CODE RIGHT; TIGER ITEM 'PLCDER'
FROMLAT		LATITUDE FROM (IMPLIED 6 DECIMAL PLACES)
FROMLONG		LONGITUDE FROM (IMPLIED 6 DECIMAL PLACES)
FSUBMCD90L		FIPS 55 CODE LEFT (SUB-MCD) - 1990 CENSUS TIGER ITEM 'FSMCDL'
FSUBMCD90R		FIPS 55 CODE RIGHT (SUB-MCD) - 1990 CENSUS TIGER ITEM 'FSMCDR'
FTYPE		FEATURE TYPE; TIGER ITEM 'FEATYP'
LEFTADD1		FROM ADDRESS LEFT; TIGER ITEM 'FRADDL'
LEFTADD2		TO ADDRESS LEFT; TIGER ITEM 'TOADDL'
LEFTFFL		FROM IMPUTED ADDRESS FLAG LEFT; TIGER ITEM 'FRIADDFL'
LEFTTFL		TO IMPUTED ADDRESS FLAG LEFT; TIGER ITEM 'TOIADDFL'
RECNUM		CENSUS RECORD NUMBER (PERMANENT)
RGTADD1		FROM ADDRESS RIGHT; TIGER ITEM 'FRADDR'
RGTADD2		TO ADDRESS RIGHT; TIGER ITEM 'TOADDR'
RGTFFL		FROM IMPUTED ADDRESS FLAG RIGHT; TIGER ITEM 'FRIADDFR'
RGTTFL		TO IMPUTED ADDRESS FLAG RIGHT; TIGER ITEM 'TOIADDFR'
RT		RECORD TYPE ( 1 = LINE SEGMENT)
SIDE		SINGLE SIDE SEGMENT CODE (1 = DATA EXIST FOR ONLY ONE SIDE OF THE SEGMENT)
SOURCE		SOURCE CODE
ST90LEFT		FIPS STATE CODE LEFT - 1990 CENSUS TIGER ITEM 'STL'
ST90RGT		FIPS STATE CODE RIGHT - 1990 CENSUS TIGER ITEM 'STR'
STREET		STREET NAME; DERIVED FROM FNAME AND FTYPE
TILE_NAME		TOWN ID
TOLAT		LATITUDE TO (IMPLIED 6 DECIMAL PLACES)
TOLONG		LONGITUDE TO (IMPLIED 6 DECIMAL PLACES)
VERSION		VERSION NUMBER
ZIPCOLEF		ZIP CODE LEFT (ONLY WHEN ADDRESS RANGE IS PRESENT); TIGER ITEM 'ZIPL'
ZIPCORGT		ZIP CODE RIGHT (ONLY WHEN ADDRESS RANGE IS PRESENT); TIGER ITEM 'ZIPR'

• OVERVIEW
• WHAT MASSGIS PROVIDES
  
• Census 1990 Blocks
• Census 1990 Block Groups
• Census 1990 TIGER Linework
• Also see the Datalayers from the 2000 U.S. Census

Last Updated 9/28/2007
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