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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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Land area - an area measurement providing the size, in square meters, of the land portions of geographic entities for which the Census Bureau tabulates and disseminates data.
ALAND10 and AWATER10 are the areas, in square meters, of the land and water in the tract in 2010. Sometimes these will be ALAND and AWATER. This was computed by the Census Bureau, and used information not present in the shape file to determine the proportions of land and water in the record.
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
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Squared meters as the docs specifies: https://www.census.gov/quickfacts/fact/note/US/LND110210
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