Since the definition of "Major Employers" might differ from region to region, you will need to bring the "Thermal" layer into GIS and symbolize it based on the data provided in the information in the Thermal Legend document. 

There is a .lyr file in this folder for the "thermals_2010.gif" file. You'll have to direct it to the right source once you bring it into ArcGIS. 

Overlay the Assisted Housing shapefile and select the ones that fall within what you consider to be "Major Employment Centers". 




Points_2010 Metadata
Demographics, Financial, and NAICS Industry Sector (C06-C21)

c000 	- Total Employees
C01	- Age 29 or Younger
C02	- Age 30 to 54
c03	- $1,250 per month or less
c04	- $1,250 per month or more
c05	- More than $3,333 per month
c06	- Agriculture, Forestry, Fishing and Hunting
c07	- Mining, Quarrying, and Oild and Gas Extraction
c08	- Utilities
c09	- Construction
c10	- Manufacturing
c11	- Wholesale Trade
c12	- Retail Trade
c13	- Transportation and Warehousing
c14	- Information
c15	- Finance and Insurance
c16 	- Real Estate and Rental and Leasing
C17	- Professional, Scientific, and Technical Services
c18	- Management of Companies and Enterprises
C19	- Administration & Support, Waste Management and Remediation
c20	- Educational Services
c21	- Health Care and Social Assistance



Please let me know if you have more questions on how to proceed with this.


Steve Waleryszak
603-357-0557
swaleryszak@swrpc.org