-----------------------------------------
 Emission Surrogate Coverage Data Sources
-----------------------------------------

-------------
UNITED STATES
-------------


Surrogate			Type		Source
--------------------------------------------------------------------------------------


Population and Housing		Polygon		1990 Census of Population, Block
						groups, and Housing, U.S. Bureau 
						of the Census
   


Agriculture			Polygon		North America Land Cover 
						Characterisitcs Data Base,
						based on 1992-1993 AVHRR satellite 
						imagery, U.S Geological Survey
					 
						
   
   
Airports			Point		National Transportation Atlas
						Database, 1999, Bureau of 
						Transportation Statistics
   

Ports				Point		National Transportation Atlas
						Database, 1999, Bureau of 
						Transportation Statistics
   
   
Railroads			Line		National Transportation Atlas
						Database, 1999, Bureau of 
						Transportation Statistics	
   

Land/Water			Polygon		North America Land Cover 
						Characterisitcs Data Base,
						based on 1992-1993 AVHRR satellite 
						imagery, U.S Geological Survey
  

Urban/Rural			Polygon		1990 Census of Population
						and Housing, Block groups.,
						U.S. Bureau of the Census
  
  
Roads (Urban/Rural)		Line		1990 TIGER line files, 1990
						Census of Population, U.S. 
						Bureau of the Census


Forest				Polygon		North America Land Cover 
						Characterisitcs Data Base,
						based on 1992-1993 AVHRR satellite 
						imagery, U.S Geological Survey


 
======================================================================================
 

------
CANADA
------

  Surrogate				Type		Source
--------------------------------------------------------------------------------------



Population and Housing 			Polygon	      Environment Canada - Pollution
					     	      Data Branch, Geographic Database,
						      October 1999.
	
    				
Agriculture				Polygon	      Environment Canada - Pollution
						      Data Branch, Geographic Database,
						      October 1999.
	


Airports				Point	      Environment Canada - Pollution
						      Data Branch, Geographic Database,
						      October 1999.
			


Ports					Point	      Environment Canada - Pollution
						      Data Branch, Geographic Database,
						      October 1999.
	


Railroads				Line	      National Atlas Digital Data,
						      1992, Geoaccess Division, 
						      Geomatics Canada


Land/Water				Polygon	      North America Land Cover 
					              Characterisitcs Data Base,
						      based on 1992-1993 AVHRR 
						      satellite imagery, U.S 
						      Geological Survey


Urban/Rural				Polygon	      National Atlas Digital Data,
						      1992, Geoaccess Division, 
				 		      Geomatics Canada		
  
       
Roads (Urban/Rural)			Line	      National Atlas Digital Data,
						      1992, Geoaccess Division, 
				 		      Geomatics Canada
 						     
						     					   	        				
Forest					Polygon	      Environment Canada - Pollution
						      Data Branch, Geographic Database,
						      October 1999.