Yes, at CB, water is substracted before calculating pop density.

From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Elizabeth Hassett
Sent: Thursday, May 19, 2011 12:25 PM
To: ctpp-news@chrispy.net
Subject: [CTPP] Census population density calculations

Hello all,

I am finding discrepancies between population densities that I’m calculating in ArcGIS using Census 2010 population data and the TIGER geography shapefiles (in my case for the county and state level), and population density numbers posted on Census websites.  The discrepancy is from the square mileage calculation, in particular.  Does anyone know if this is because water bodies are subtracted from the total square mileage for the density calculation (or if there is another reason for the discrepancy)? 

Thank you,

Elizabeth

Elizabeth Hassett

Syracuse Metropolitan Transportation Council

100 Clinton Square

126 N. Salina Street, Suite 100

Syracuse, NY 13202

ehassett@smtcmpo.org

(P) 315-422-5716

(F) 315-422-7753