What does Shape_area mean? I noticed that it is not the sum of Aland and Awater. What are the units of these three?
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2 Answers
The units of ALAND and AWATER are square meters. E.g., tl_2015_us_county.dbf has a record for Cuming County with ALAND = 1477895811 and AWATER = 10447360. From Wikipedia the area is 575 mi^2. If you convert 575 mi^2 to sq. meters you get same result as ALAND + AWATER
answered Oct 23, 2015 at 20:59
Squared meters as the docs specifies: https://www.census.gov/quickfacts/fact/note/US/LND110210
