This weekly blog will deal with things GIS, including Computer Cartography, Thematic Cartography, Census Data, and other areas of interest.
The first issue is to identify your client, and their requirements. A map of Housing Index data means both county-level and MSA-level data; an appropriate visualization would be to extrapolate current counties/MSAs back in time, according to the data. For a bank Compliance Officer, a 2010 map of Census Tracts shaded by "Income as a % of MSA Median", however, would use Census Tracts (boundaries defined by the US Census Bureau), but only those FIPS Codes mandated by the Federal Financial Institutions Examination Council (the FFIEC).
Each year, the FFIEC issues "A Guide To HMDA Reporting: Getting It Right!". Among other changes, the 2010 edition was updated to reflect the US Census Bureau making a couple changes to county codes in Alaska, separating Hoonah-Angoon from Skagway-Hoonah-Angoon (232) and assigning Hoonah-Angoon (105) as a separate small county; and giving a new county code 230 to Skagway.
The FFIEC has chosen to wait until 2010 to apply a County-change in Alaska that the US Census Bureau officially noted was effective June 20, 2007. Additionally, the FFIEC has not yet implemented 2 additional Alaska County-changes, one of which was was officially noted effective 5/19/2008, and the other effective June 1, 2008.
http://www.census.gov/geo/www/ansi/changenotes.html
The point is, for 2010 Census Tract Mapping for Bank Compliance Officers, yes - remove Alaska County 232 and include Alaska Counties 105 and 232, but no - do not change Alaska Counties 130, 201, 280.
Note for HMDA Geocoding users: 904 MAIN ST, SKAGWAY, AK 99840 should geocode to County 230, Census Tract 0001.00 for 2010, but to County 232, Census Tract 0001.00 for prior years.
Dennis C. Dixon
Geo-Information Specialist
Dixon Spatial Consulting
dennis.dixon@dixonspatialconsulting.com
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