Table 1. Files in this numeric data package
File File name File size File description no. (bytes) 1 ndp055.txt 68,055 Descriptive file 2 trop_africa.prj 809 ARC/INFO projection file with parameters for the ARC/INFO grids and coverages in this NDP. 3 biomax.e00 32,740,858 ARC/INFO exported integer grid containing maximum potential biomass density data in Mg/ha. 4 biomax.asc 10,158,473 ASCII file containing maximum potential biomass density data in Mg/ha produced using the ARC/INFO GRIDASCII command. 5 lakes.e00 32,740,652 ARC/INFO exported integer grid containing the location of all nonseasonal lakes (> 20 km in any direction) in Tropical Africa. 6 lakes.asc 13,785,885 ASCII file containing the location of all nonseasonal lakes (>20 km in any direction) in Tropical Africa, produced using the ARC/INFO GRIDASCII command. 7 land.e00 32,740,652 ARC/INFO exported integer grid containing land-use information classified into four categories. 8 land.asc 9,032,121 ASCII file containing land-use information classified into four categories produced using the ARC/INFO GRIDASCII command. 9 intgrid.for 874 FORTRAN retrieval program to read and print the ASCII data files biomax.asc, lakes.asc, and land.asc (output from the ARC/INFO GRIDASCII command for the integer grids: biomax, lakes, and land). 10 intgrid.sas 356 SAS retrieval program to read and print the ASCII data files biomax.asc, lakes.asc, and land.asc (output from the ARC/INFO GRIDASCII command for the integer grids: biomax, lakes, and land). 11 bio1980.e00 32,740,307 ARC/INFO exported floating-point grid containing the calculated actual aboveground live biomass in open and closed forests for 1980 in Mg/ha. 12 bio1980.asc 13,936,491 ASCII file containing the calculated actual aboveground live biomass in open and closed forests for 1980 in Mg/ha (produced using the ARC/INFO GRIDASCII command). 13 pd80.e00 32,740,307 ARC/INFO exported floating-point grid containing population -density data for 1980 in people per km 2. 14 pd80.asc 12,899,980 ASCII file containing population-density data for 1980 in people per km 2(produced using the ARC/INFO GRIDASCII command). 15 realgrid.for 862 FORTRAN retrieval program to read and print the ASCII data files pd80.asc and bio1980.asc (output from the ARC/INFO GRIDASCII command for the floating point grids: bio1980 and pd80). 16 realgrid.sas 362 SAS retrieval program to read and print the ASCII data files pd80.asc and bio1980.asc (output from the ARC/INFO GRIDASCII command for the floating point grids: bio1980 and pd80). 17 africa.e00 367,612 ARC/INFO exported coverage that contains the amount of land and biomass in open and closed forest by country for 1980. 18 t_afr.e00 1,333,765 ARC/INFO exported coverage that contains population density data for 1960, 1970, 1980, and 1990 for the subnational political units used in this data base. 19 africa.asc 5,187 ASCII file containing the attribute information associated with africa.PAT derived from africa.e00 (file 17). and biomass in open and closed forest by country for 1980. 20 africa.for 642 FORTRAN retrieval program to read and print africa.asc (file 19). 21 africa.sas 422 SAS retrieval program to read and print africa.asc (file 19). 22 t_afr.asc 78,701 ASCII file containing the attribute information associated with t_afr.PAT derived from t_afr.e00 (file 18). 23 t_afr.for 600 FORTRAN retrieval program to read and print t_afr.asc (file 22). 24 t_afr.sas 388 SAS retrieval program to read and print t_afr.asc 25 africa_1980bio.gif 29576 Graphic map, "Calculated Actual Aboveground Live Biomass (1980)" 26 africa_biomax.gif 30450 Graphic map, "Maximum Potential Biomass Density" 27 africa_lc.gif 28052 Graphic map, "Land Use" 28 areaclsdforest.gif 15343 Graphic map, "Area of Closed Forest (By Country)" 29 areaopnforest.gif 15279 Graphic map, "Area of Open Forest (By Country)" 30 clsdforestbio.gif 14575 Graphic map, "Mean Biomass of Closed Forests (By Country)" 31 opnforestbio.gif 14903 Graphic map, "Mean Biomass of Open Forests (By Country)" 32 pctforest.gif 13891 Graphic map, "Percent Forest Cover (By Country)" 32 totforestbio.gif 15532 Graphic map, "Total Forest Biomass (By Country)" 33 pop1990.gif 27215 Graphic map, "Population Density - 1990" 34 pop1980.gif 26770 Graphic map, "Population Density - 1980" 35 pop1970.gif 26713 Graphic map, "Population Density - 1970" 36 pop1960.gif 24530 Graphic map, "Population Density - 1960" 37 table.txt 22112 ASCII version of this file (data tables)
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Table 2. Assignment of the biomass indices to potential biomass densities based on forest inventories.
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Potential biomass index Potential biomass (Mg/ha)
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41 - 45 1
46 - 50 7
51 - 55 15(limit of open forest)
56 - 60 27
61 - 65 42
66 - 70 75
71 - 75 150
76 - 80 250
81 - 85 350
86 - 90 425
91 - 95 475
96 - 100 500
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Table 3. Emission of CO2, CO, and CH4, that would have occurred if the measured reduction in dry biomass (from potential to actual in 1980) were burned as fuelwood.
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Emissions from fuelwood burning
Closed Forest Open Forest
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Biomass reduction (kg/ha) 86,900 40,500
Carbon reduction (kg/ha) 43,450 20,250
Emissions (g of C/ha)
C[C02] 34,760 +/- 5,648 16,200 +/- 2,633
C[C0] 2,607 +/- 869 1,215 +/- 405
C[CH4] 130 +/- 52 61 +/- 24
C[other1] 5,953 2,774
Total area (ha) 402.5 x 106 815.6 x 106
Total Emissions (kg)
C[C02] 14.00 x 1012 13.21 x 1012
C[C0] 1.05 x 1012 0.99 x 1012
C[CH4] 0.05 x 1012 0.05 x 1012
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1Predominantly charcoal.
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Table 4. Variable formats for biomax.asc, lakes.asc, and land.asc
Variable Variable Variable Starting Ending Description
type width column column
NCOLS Integer 5 15 19 The number of columns in
the data file (values per row)
NROWS Integer 5 15 19 The number of rows in the data file
XLLCORNR Real 15.5 15 29 The X coordinate of the lower-left
corner of a box covering the data area
YLLCORNR Real 15.5 15 29 The Y coordinate of the lower-left
corner of a box covering the data area
CSIZE Integer 5 15 19 The size in meters of the square
grid cells
NODATA Integer 5 15 19 The value (i.e., -9999) used to
represent areas with NO DATA
------------------END OF HEADER----------------------
VALUE(1,1) Integer 5 2 6 An explanation of the "value" field
is found at the end of table 2.
VALUE(1,2) Integer 5 8 12
...
VALUE(1,1533) Integer 5 9,194 9,198
VALUE(1,1534) Integer 5 9,200 9,204
------------------END OF ROW 1-----------------------
VALUE(2,1) Integer 5 2 6
VALUE(2,2) Integer 5 8 12
...
VALUE(2,1533) Integer 5 9,194 9,198
VALUE(2,1534) Integer 5 9,200 9,204
------------------END OF ROW 2-----------------------
...
VALUE(1502,1534) Int 5 9,200 9,204
------------------END OF FILE-------------------------
BIOMAX.ASC/BIOMAX.VAT* - "value" is a single cell of an integer array with 1,502 rows and
1,534 columns containing the maximum potential aboveground
biomass in Mg/ha estimated using climatic, topographic, and
geomorphic information.
LAKES.ASC/LAKES.VAT* - "value" is a single cell of an integer arry with 1,502 rows and
1,534 columns showing the location of non-seasonal medium-to-large
lakes in Africa. Cells may have a value of -999 (NODATA) or 4. A
value of 4 indicates that 50% or more of the cell's 25 km2
area was underwater in 1980.
LAND.ASC/LAND.VAT* - "value" is a single cell of an integer array with 1,502 rows and
1,534 columns containing one of four land-use classes:
Value Land Cover
1 Closed Forest (includes tropical and seasonal forests)
2 Open Forest (woodland/wooded savanna)
3 Grassland Savanna
4 Other (includes agriculture)
-9999 No Data
*Use the IMPORT GRID command at the ARC prompt to import the *e00 files (biomax.e00,
lakes.e00, and land.e00) into ARC/INFO. The VAT (value attribute table) associated with
each of these integer grids is populated with a field called VALUE (see descriptions above)
and a field named COUNT (which records the number of times a VALUE is encountered within the
grid).
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Table 5. Variable formats for pd80.asc and bio1980.asc.
Variable Variable Variable Starting Ending Description
type width column column
NCOLS Integer 5 15 19 The number of columns in
the data file (values per row)
NROWS Integer 5 15 19 The number of rows in the data file
XLLCORNR Real 15.5 15 29 The X coordinate of the lower-left
corner of a box covering the data area
YLLCORNR Real 15.5 15 29 The Y coordinate of the lower-left
corner of a box covering the data area
CSIZE Integer 5 15 19 The size in meters of the square
grid cells
NODATA Real 8.2 15 22 The value (i.e., -9999).00 used to
represent areas with NO DATA
------------------END OF HEADER----------------------
VALUE(1,1) Real 8.2 2 9 An explanation of the "value" field
is found at the end of table 2.
VALUE(1,2) Real 8.2 11 18
...
VALUE(1,1533) Real 8.2 13,790 13,797
VALUE(1,1534) Real 8.2 13,799 13,806
------------------END OF ROW 1-----------------------
VALUE(2,1) Real 8.2 2 9
VALUE(2,2) Real 8.2 11 18
...
VALUE(2,1533) Real 8.2 13,790 13,797
VALUE(2,1534) Real 8.2 13,799 13,806
------------------END OF ROW 2-----------------------
...
VALUE(1502,1534)Real 8.2 13,799 13,806
------------------END OF FILE-------------------------
PD80.ASC* - "value" is a single cell of a real number array with 1,502 rows and
1,534 columns containing population densities recorded in
people per km2 for sub-national political units in
Tropical Africa.
BIO1980.ASC* - "value" is a single cell of a real number array with 1,502 rows and
1,534 columns containing an estimate of the aboveground biomass
density of wooded vegetation in 1980 for Tropical Africa. Values
are in Mg/ha and were estimated based on the maximum potential
biomass data (BIOMAX.ASC), the land-use data (LAND.ASC and
LAKES.ASC), and a degradation ratio derived from the population
information in T_AFR.ASC.
*Use the IMPORT GRID command at the ARC prompt to import the *e00 files (pd80.e00 and
bio1980.e00) into ARC INFO. These are floating point grids and therefore do not have a
VAT (value attribute table) associated with them. Grid values are described above.
------------------------------------------------------------------------------------------------
Table 6. Variable formats of t_afr.asc/t_afr.pat.
Variable Variable Variable Starting Ending Description
type width column column
COUNTRY Character 30 1 30 Country name.
CNTRY_NO Integer 5 32 36 A unique numeric identification code
for each country.
ADMP Integer 4 38 41 A unique identification code for
administrative divisions or
metropolitan places in Tropical Africa.
ADMP_NM Character 40 43 82 The name of the given division,
metropolitan place, or subnational
political unit.
PD60 Real 8.3 84 91 The population density for 1960 in
people/km2
PD70 Real 8.3 93 100 The population density for 1970 in
people/km2
PD80 Real 8.3 102 109 The population density for 1980 in
people/km2
PD90 Real 8.3 111 118 The population density for 1990 in
people/km2
LANDAREA Integer 10 120 129 The land area in km2 of the
given division, metropolitan place, or
subnational political unit.
*Use the IMPORT COVER command at the ARC prompt to import t_afr.e00 into ARC/INFO. The
polygon coverage has a PAT (polygon attribute table) associated with it. The items
descriptions listed above refer to t_afr.asc (ASCII file) and to items carried
on the T_AFR.PAT.
NOTE: Values of -1.00 for variables PD60, PD70, PD80 and PD90 indicate that data were
not available from the FAO for the given political subdivision.
------------------------------------------------------------------------------------------------
Table 7. Variables formats of africa.asc/africa.patsum1980.
Variable Variable Variable Starting Ending Description
type width column column
COUNTRY Character 30 1 30 Country name.
CNTRY_NO Integer 5 32 36 A unique numeric identification code
for each country.
TOTCEL Integer 11 38 48 The number of 5km x 5km cells
within a country.
TOTAREA Integer 10 50 59 The land area (km2) in
COUNTRY.
CFAREA Integer 9 61 69 The amount of land in closed forests
(km2) in COUNTRY.
OFAREA Integer 9 71 79 The amount or land in open forests
(km2) in COUNTRY.
CFBIO Real 12.1 81 92 The mean biomass of closed forests
(Mg/ha) for COUNTRY.
OFBIO Real 12.1 94 105 The mean biomass of open forests
(Mg/ha) for COUNTRY.
TOTBIO Real 12.4 107 118 The total biomass of forests
(106 Mg) in COUNTRY.
FOREST Real 12.1 120 131 The percent of COUNTRY that is
forested.
*Use the IMPORT COVER command at the ARC prompt to import africa.e00 into ARC/INFO. The
polygon coverage has a PAT (polygon attribute table) and an additional INFO table related
to region attributes. The item descriptions listed above refer to items in the africa.asc
(ASCII file) and to items carried on the INFO table africa.patsum1980
NOTE: There are no NODATA flags in this file.
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