Not sure if I’ll get the time to do this but I was giving some thought to it.  Does anyone know for certain if this is the NLCD impervious dataset that is being used in the criteria?


The Federal Register doesn’t  go into much detail on how the percent impervious area data  is used in the criteria.  Is the impervious area translated to census block geography (raster to vector)? The footnotes in the register suggest some subjectivity which would could make it difficult to incorporate into code.


Dan Seidensticker
GIS Specialist
Madison Area Transportation Planning Board:

A Metropolitan Planning Organization (MPO)
City of Madison Planning Division
121 S. Pinckney Street, Suite 400
Madison, WI 53703
Voice: 608-266-9119
Fax: 608-261-9967



From: [] On Behalf Of
Sent: Monday, September 26, 2011 1:57 PM
Subject: [CTPP] Are you writing GIS code to estimate Urbanized Area Boundaries using 2010 Census


I can’t remember who told me they were writing some ArcGIS code to estimate what the Census Bureau’s new urbanized (50,000+) areas might be, based on the CB’s Federal Register notice of the final criteria.  If you are willing to share your code, I think that there are others who would be interested in applying it in their own area.


I checked with the Census Bureau Geography and they said they were NOT going to share their code. 


FHWA decided NOT to attempt this task, as we will just WAIT for the list and boundaries to be released from the Census Bureau. 


Elaine Murakami

FHWA Office of Planning

206-220-4460 (in Seattle)