CGEIC Global Population Database 97/06/10 This file contains information about the global population data sets available on the CGEIC web site. The database consists of three data sets which have been compiled in ascii text format. The data sets are described below: 1. 1990pop.dat: Gridded global population distributions for 1990 with 1X1 latitude/longitude resolution The format(fortran) of the 5 fields is: (I6,1X,E10.6,1X,E10.6,1X,A3,8X,A50). The 5 fields are as follows: - Geia-id Integer Grid code number = jgrid, igrid - Pop1990 Real Total population contained in each grid cell for each country Total population: 5,291,059,610 - Ratio(%) Real Ratio of the population in cell to total population of country - UNCode2 Character United Nations standard ISO country codes (See Notes below) - Country Character Country/region name Number of Records: 12,859 Number of Cells: 11,783 Number of Countries: 210 Source: Yi-Fan Li, "Global Population Distribution Database", A Report to the United Nations Environment Programme, under UNEP Sub-Project FP/1205-95-12, March 1996. 2. ratec90.dat: The relationship between grid cells and countries The format (fortran) of the 5 fields is: (I6,1X,F10.6,1X,I2,9X,A3,8X,A40). The 5 fields are as follows: - Geia-id Integer Grid code number = jgrid, igrid - Rate-in-Country Real Percentage of the area of a country contained in each grid cell - Cover-Id Integer Cover ID number "0": All covered by sea "1": Entirely contained in one country "2": Shared by two countries "3": Shared by three countries "4": Shared by four countries "10": Shared by one country and ocean "20": Shared by two countries and ocean "30": Shared by three countries and ocean "40": Shared by four countries and ocean - UNCode2 Character United Nations ISO country codes (See Notes below) - Country Character Country/region name Number of Records: 19,846 Number of Cells: 17,609 Number of Countries: 201 Source: Li, Y. F., McMillan, A., and Scholtz, M. T., "Global HCH usage with 1X1 longitude/latitude resolution", Environmental Science & Technology, 30, 3525-3522(1996) 3. rateg90.dat: The percentage of the grid cell area occupied by land or ocean The format (fortran) of the 5 fields is: (I6,1X,F10.6,1X,I2,9X,A3,8X,A40). The 5 fields are as follows: - Geia-id Integer Grid code number = jgrid, igrid - Rate-in-Grid(%) Real Percentage of the area of the grid cell occupied by country or the ocean - Cover-Id Integer Cover ID number (see above) - UNCode2 Character United Nations ISO country codes (See Notes below) - Country Character Country/region name Number of Records: 24,394 Number of Cells: 17,610 Number of Countries: 203 Source: Li, Y. F., McMillan, A., and Scholtz, M. T., "Global HCH usage with 1X1 longitude/latitude resolution", Environmental Science & Technology, 30, 3525-3522(1996) NOTES: 1) In addition to the standard UN code for the year 1990 the following un-ids were used: C04 Canary-Islands B02 Gaza-Strip B01 Guernsey B10 ISRAELI-OCCUPIED-TER C07 Jan-Mayen B03 Jersey B07 St.-Helena C11 St.-Martin C16 Ocean 2) For Czechoslovakia and Yugoslavia different names were used in the different files: 203 Czech-Republic (1990pop.dat) 703 Slovakia (1990pop.dat) 200 Czechoslovakia (ratec90.dat and rateg90.dat) Definition of Grid Number: -------------------------- 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 ********************************************************************* HAVE YOU REGISTERED? If you have not already done so, please take a moment to register with us at our CGEIC web site. 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