The database consists of three datasets which have been compiled in dBase IV format. The datasets are described below:
GlPop90.dbf: Gridded global population distributions for 1990 with 1X1 latitude/longitude resolution
Fields:
- UNCode2 |
United Nations standard ISO Country Codes |
- Country |
Country/region name |
- Grid | Grid code number |
- Pop1990 | Total population contained in each grid cell for each country |
- Rate(%): | The ratio of the population in the cell to total population of country, not the annual growth. |
Total population: | 5,291,059,610 |
Number of Records: | 12,857 |
Number of Cells: | 11,783 |
Total Number of Countries: | 209 |
GridCtry.dbf: The relationship between grid cells and countries (see ref. 1)
Fields:
- Grid | Grid code number |
- Cover-Id | Cover ID Number |
"0": | All covered by sea |
"1": | Entirely contained in one country |
"2": | Shared by two countries |
"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 | United Nations standard ISO country codes |
- Country | Country/region name |
- Rate-in-Country (%) | Percentage of the area of a country contained in each grid cell |
- Rate-in-Grid (%) | Percentage of the area of the grid cell occupied by country or the ocean |
Number of Records | 25,540 |
Number of Cells: | 12,200 |
Total Number of Countries: | 217 |
PopFact.dbf: Rural population distribution factor for 1990 with 1X1 latitude/longitude resolution
Fields:
- Grid | Grid code number |
- UNCode2 | United Nations standard ISO country codes |
- PopFactor | Rural population distribution factor in grid cell |
Number of Records: | 13,227 |
Number of Cells: | 12,196 |
Number of Countries: | 210 |
Grid Code Number = (j*1000) + i
j: row number starting at 1 for 90°S to 89°S latitude, to 180 for 89°N to 90°N latitude
i: column number starting at 1 for 180°W to 179°W longitude, to 360 for 179°E to 180°E longitude
The latitude and longitude of the centre of the grid cell is given by:
latitude = (j-91) + 0.5
longitude = (i-181) + 0.5
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