CGEIC Global Lead Emissions Inventory (GEIA Global Lead Emissions Inventory,
Version 1)
								97/06/23
						(last updated from 97/04/07)

This file contains information about the lead data sets available on the CGEIC
web site <http://www.info.ortech.on.ca/cgeic>. Details of the methodology used
in compiling the inventory are given in Pacyna, Jozef M., M. Trevor Scholtz and
Y-F. Li, Global Budgets of Trace Metal Sources, Environmental Reviews,
3:145-159 (1995). The emissions are gridded on a 1 x 1 degree latitude-longitude
grid. 

The three lead files, totalpb.prn (all sources), pointpb.prn (>100 m sources) 
and areapb.prn (<100 m sources) each consist of five comma delimited fields as 
follows:

	1) Grid
	2) latitude
	3) longitude
	4) Emission_low	 (Sum = 167,889, Maximum Value = 3037.093680)
	5) Emission_high (Sum = 206,435, Maximum Value = 3646.066781)

Definition of Data Fields:
--------------------------
Fields 2 and 3 are 1x1 latitude, longitude coordinates in degrees.  

Field 1     Grid Number

            The GEIA grid is used, which is a 180x360 grid with 1 degree latitude
            x 1 degree longitude cells. The latitude - longitude coordinates of a 
            cell are those of the southwest corner of the grid cell. Note: Only grid
            cells which contain emissions are included in this file. Grid cell numbers
            are a packed integer representing both latitude and longitude as described
            below:
            
            Grid number= (latitude+91)*1000+(longitude+181)

            The origin, packed cell number 1001 for this grid system is located
            at the lower left edge of the grid, which corresponds to -90 degrees
            latitude, -180 degrees longitude.

            To unpack the grid number into Latitude and Longitude follow these
            steps:
            
	    1) Divide Grid Number by 1000
               example: 1003 / 1000 = 1.003 

            2) To calculate Latitude take the integer portion of the number in
               Step 1) and subtract 91.
               example: Latitude = 1 - 91 = -90 degrees latitude

            3) To calculate Longitude take the decimal portion of the number
               in Step 1) and multiply by 1000 (e.g. 1.003 = 3) and subtract 181.
               example: Longitude = 3 - 181 = -178 degrees longitude
Notes:
------
1. Fields 4 and 5, Emission_low and Emission_high, are the low and high estimates
of lead emissions rate(tonne of lead per grid per year), respectively; these
estimates are based on emission factors that were assumed to be the highest and 
the lowest values within the emission factor ranges for a given source category.

2. Point sources such as smelters and other mahor point sources of lead are 
assumed to have a physical stack height and sufficient buoyant plume rise that
the emissions are transport in the atmosphere above 100m. Other distributed 
sources, such as transportation, are reported in the area emissions file.



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