PLEASE NOTE: This is the Version 1.2 release of the Africa land cover characteristics data base. It has not yet been validated and is subject to review. Following validation, the data base will be modified based on the lessons learned.
The Africa land cover data base is one portion of a global land cover characteristics data base that is being developed on a continent-by-continent basis. All continents in the global data base share the same map projections (Interrupted Goode Homolosine and Lambert Azimuthal Equal Area), have 1-km nominal spatial resolution, and are based on 1-km AVHRR data spanning April 1992 through March 1993. Each continental data base has unique elements that are based on the salient geographic aspects of the specific continent. In addition, a core set of derived thematic maps produced through the aggregation of seasonal land cover regions are included in each continental data base. These are:
The legends for each of these derived data sets can be found in Section 4.2 - 4.7.
For a description of the methodology for the global data base, see the global readme file found under the EROS Data Center DAAC home page (http://edcwww.cr.usgs.gov/landdaac/glcc/glcc.html).
The Africa land cover characteristics data are in a flat, headerless raster format. The pixel values correspond to class numbers defined in the appropriate land cover classification scheme legend. Data are distributed as compressed and uncompressed single-band images. The files can be obtained either by anonymous file transfer protocol (ftp) or downloaded from the EDC Distributed Active Archive Center (DAAC) World Wide Web site: (http://edcwww.cr.usgs.gov/landdaac/glcc/af_int.html). The instructions for accessing these files are contained in the following two sections.
1.1 Anonymous FTP for PC or UNIX Users
1.2 Downloading from the World Wide Web Site
From the Africa Land Cover page, select either data in Interrupted Goode Homolosine projection or data in Lambert Azimuthal Equal Area projection. The selection will link to a page that contains links to all documentation files and the image files (both compressed and uncompressed). NOTE: World Wide Web browsers can vary in how the files will be downloaded. On PCs, some browsers will allow a user to interactively select the location where the file will be saved and to edit the file name. However, on certain browsers files may be automatically downloaded to a default storage location on the local system.
The Africa data base is available in two different map projections: the Interrupted Goode Homolosine and the Lambert Azimuthal Equal Area (see Steinwand, 1994, and Steinwand and others, 1995, for a complete description of these projections).
2.1 Interrupted Goode Homolosine Projection Parameters
The data dimensions of the Interrupted Goode Homolosine projection for the Africa land cover characteristics data set are 8,676 lines (rows) and 8,350 samples (columns) resulting in a data set size of approximately 66 megabytes for 8-bit (byte) images. The following is a summary of the map projection parameters used for this projection:
Projection Type: Interrupted Goode Homolosine
Units of measure: meters
Pixel Size: 1000 meters
Radius of sphere: 6370997 m
XY corner coordinates (center of pixel) in projection units (meters):
Lower left: (-1998000, -4146000)
Upper left: (-1998000, 4529000)
Upper right: (6351000, 4529000)
Lower right: (6351000, -4146000)
2.2 Lambert Azimuthal Equal Area Projection Parameters
The data dimensions of the Lambert Azimuthal Equal Area projection for the Africa land cover characteristics data set are 9,276 lines (rows) and 8,350 samples (columns) resulting in a data set size of approximately 77 megabytes for 8-bit (byte) images. The following is a summary of the map projection parameters used for this projection:
Projection Type: Lambert Azimuthal Equal Area
Units of Measure: meters
Pixel Size: 1000 meters
Radius of sphere: 6370997 m
Longitude of origin: 20 00 00 E
Latitude of origin: 5 00 00 N
False easting: 0.0
False northing: 0.0
XY corner coordinates (center of pixel) in projection units (meters):
Lower left: ( -4458000, -4795000)
Upper left: ( -4458000, 4480000)
Upper right: ( 3891000, 4480000)
Lower right: ( 3891000, -4795000)
FILE (OR DIRECTORY) DATA DESCRIPTION TYPE/pub/data/glcc/af Africa
/pub/data/glcc/af/goode Goode's Interrupted Homolosine Projection
afdoc1_2.txt ascii Africa readme text afslcr1_2.leg ascii Africa Seasonal land cover regions legend bats.leg ascii BATS legend igbp.leg ascii IGBP legend oge.leg ascii Global Ecosystems legend sib.leg ascii SIB legend sib2.leg ascii SIB2 legend usgs.leg ascii USGS land use/land cover legend afbats1_2g.img.gz byte BATS image afdemg.img.gz I*2 DEM image afigbp1_2g.img.gz byte IGBP image afoge1_2g.img.gz byte Global Ecosystems image afsib1_2g.img.gz byte SIB image afsib21_2g.img.gz byte SIB2 image afslcr1_2g.img.gz byte Seasonal land cover regions image afurbang.img.gz byte Digital Chart of the World urban image afusgs1_2g.img.gz byte USGS land use/land cover image
/pub/data/glcc/af/goode/ndvimon Monthly NDVI Composite Images
afaprndg.img.gz byte April, 1992 NDVI image afmayndg.img.gz byte May, 1992 NDVI image afjunndg.img.gz byte June, 1992 NDVI image afjulndg.img.gz byte July, 1992 NDVI image afaugndg.img.gz byte August, 1992 NDVI image afsepndg.img.gz byte September, 1992 NDVI image afoctndg.img.gz byte October, 1992 NDVI image afnovndg.img.gz byte November, 1992 NDVI image afdecndg.img.gz byte December, 1992 NDVI image afjanndg.img.gz byte January, 1993 NDVI image affebndg.img.gz byte February, 1993 NDVI image afmarndg.img.gz byte March, 1993 NDVI image
/pub/data/glcc/af/lambert Lambert Azimuthal Equal Area Projection
afdoc1_2.txt ascii Africa readme text afslcr1_2.leg ascii Africa seasonal land cover regions legend bats.leg ascii BATS legend igbp.leg ascii IGBP legend oge.leg ascii Global Ecosystems legend sib.leg ascii SIB legend sib2.leg ascii SIB2 legend usgs.leg ascii USGS land use/land cover legend afbats1_2l.img.gz byte BATS image afdeml.img.gz I*2 DEM image afigbp1_2l.img.gz byte IGBP image afoge1_2l.img.gz byte Global Ecosystems image afsib1_2l.img.gz byte SIB image afsib21_2l.img.gz byte SIB2 image afslcr1_2l.img.gz byte Seasonal land cover regions image afurbanl.img.gz byte DCW urban image afusgs1_2l.img.gz byte USGS land use/land cover image
/pub/data/glcc/af/lambert/ndvimon Monthly NDVI Composite Images
afaprndl.img.gz byte April, 1992 NDVI image afmayndl.img.gz byte May, 1992 NDVI image afjunndl.img.gz byte June, 1992 NDVI image afjulndl.img.gz byte July, 1992 NDVI image afaugndl.img.gz byte August, 1992 NDVI image afsepndl.img.gz byte September, 1992 NDVI image afoctndl.img.gz byte October, 1992 NDVI image afnovndl.img.gz byte November, 1992 NDVI image afdecndl.img.gz byte December, 1992 NDVI image afjanndl.img.gz byte January, 1993 NDVI image affebndl.img.gz byte February, 1993 NDVI image afmarndl.img.gz byte March, 1993 NDVI image
4.1 Africa Seasonal Land Cover Regions Legend
Africa, v 1.2
Value Description
1 CROPLAND WITH SHRUBLAND
2 CROPLAND (PEANUTS) WITH BAOBAB/ACACIA
3 CROPLAND (PEANUTS)
4 CROPLAND WITH WETLAND
5 NONIRRIGATED CROPLAND
6 CROPLAND (CORN, GRAINS)
7 NONIRRIGATED CROPLAND
8 CROPLAND, VINEYARDS, ORCHARDS
9 CROPLAND
10 CROPLAND (SUGAR CANE AND OTHER CROPS)
11 CROPLAND
12 CROPLAND WITH GRASS
13 NONIRRIGATED CROPLAND
14 CROPLAND WITH GRASSLAND SAVANNA
15 CROPLAND
16 CROPLAND
17 CROPLAND WITH SCLEROPHYLLOUS FOREST
18 CROPLAND
19 CROPLAND
20 CROPLAND
21 CROPLAND (RICE)
22 IRRIGATED AGRICULTURE
23 SUDANIAN WOODLAND/AGRICULTURE MOSAIC
24 SCLEROPHYLLOUS FOREST/CROPLAND
25 SHRUBLAND/IRRIGATED CROPS/TREE CROPS
26 DEGRADED TROPICAL FOREST/CROPLAND MOSAIC
27 TROPICAL FOREST/CROPLAND MOSAIC
28 CROPLAND/PLANTATIONS/SAVANNA MOSAIC
29 CROPLAND/WOODLAND SAVANNA
30 SECONDARY TROPICAL FOREST WITH CROPS
31 SCLEROPHYLLOUS FOREST/CROPLAND
32 SECONDARY TROPICAL FOREST/CROPLAND
33 SECONDARY TROPICAL FOREST WITH CROPS
34 CROPLAND/MIOMBO WOODLAND
35 CROPLAND/DEGRADED FOREST SAVANNA
36 CROPLAND/SHRUBLAND
37 CROPLAND/FRUIT/VINEYARDS/SECONDARY FOREST
38 CROPLAND WITH TROPICAL FOREST
39 SECONDARY TROPICAL FOREST/AGRICULTURE/PASTURE
40 CROPLAND/TROPICAL FOREST
41 TROPICAL FOREST/CROPLAND MOSAIC
42 SUBTROPICAL FOREST/CROPLAND
43 DESERT GRASSLAND WITH CROPS
44 CROPLAND/SAVANNA/BUSHLAND MOSAIC
45 SAVANNA/CROPLAND MOSAIC
46 GRASSLAND/CROPLAND (WHEAT, SMALL GRAINS)
47 CROPLAND/SAVANNA MOSAIC
48 SAVANNA/CULTIVATED CROPS
49 CROPLAND/SAVANNA MOSAIC
50 SAVANNA/CROPLAND
51 SEMI-DESERT GRASSLAND WITH SHRUBLAND
52 GRASSLAND WITH ACACIA BUSHLAND
53 GRASSLAND/ACACIA SHRUBLAND WITH CROPLAND
54 GRASSLAND/SHRUBLAND
55 GRASSLAND WITH CROPLAND
56 GRASSLAND/SHRUBLAND
57 GRASSLAND WITH CROPLAND, WETLAND
58 DESERT SHRUBLAND/GRASSLAND
59 DESERT SHRUBLAND/GRASSLAND
60 DESERT SHRUBLAND/GRASSLAND
61 DESERT SHRUBLAND/GRASSLAND
62 ACACIA SHRUBLAND/GRASSLAND
63 GRASSLAND/SHRUBLAND
64 GRASSLAND/SHRUBLAND
65 GRASSLAND/SHRUBLAND
66 SHRUBLAND/GRASSLAND
67 GRASSLAND/ACACIA SHRUBLAND
68 BUSH/SHRUBLAND
69 SAHEL SHRUBS WITH ANNUAL GRASSES
70 SPARSE SAHEL SHRUBS/SAHARA HAMMADAS
71 DESERT SHRUBLAND WITH SUCCULENTS
72 ACACIA BUSH/THORNLAND THICKET
73 DESERT/HAMMADAS/SHRUBLAND
74 SEMI-DESERT SHRUBLAND WITH GRASSLAND
75 SHRUBLAND WITH GRASSLAND
76 ACACIA BUSHLAND/THICKETS
77 SHRUBLAND WITH GRASSLAND
78 ACACIA BUSHLAND/THICKET
79 ACACIA BUSHLAND/THICKET
80 ACACIA BUSHLAND/THICKET
81 ACACIA SHRUBLAND/BUSHLAND
82 BUSH WOODLAND
83 ACACIA BUSHLAND/THICKET
84 ACACIA BUSHLAND THICKET
85 GRASSLAND/SUDANIAN WOODLAND
86 SUDANIAN WOODLAND/SAVANNA
87 SUDANIAN WOODLAND/SAVANNA
88 GRASSLAND WITH WOODLAND
89 SUDANIAN WOODLAND WITH CROPS
90 WOODLAND/HIGH VELD GRASSLAND
91 DECIDUOUS THICKET/GRASSLAND MOSAIC
92 ACACIA SHRUBLAND/GRASSLAND MOSAIC
93 DRY DECIDUOUS FOREST/GRASSLAND MOSAIC
94 DRY DECIDUOUS FOREST/GRASSLAND MOSAIC
95 WOODLAND/GRASSLAND
96 SUDANIAN WOODLAND WITH CROPS
97 SHRUB SAVANNA
98 WOODLAND/GRASS/SHRUB MOSAIC
99 OPEN MIOMBO WOODLAND/SAVANNA
100 MONTANE DRY SPARSE FOREST/GRASSLAND
101 DECIDUOUS FOREST/GRASSLAND MOSAIC
102 SUDANIAN WOODLAND WITH CROPS
103 SAVANNA
104 OPEN MIOMBO WOODLAND WITH CROPLAND
105 SAVANNA WITH AGRICULTURE
106 SAVANNA
107 DRY FOREST/GRASSLAND WITH CROPS
108 WOODLAND/ACACIA/GRASSLAND MOSAIC
109 SUDANIAN WOODLAND
110 OPEN MIOMBO WOODLAND/SAVANNA
111 WOODLAND/GRASSLAND SAVANNA
112 DRY FOREST/GRASSLAND
113 DRY FOREST/GRASSLAND SAVANNA
114 OPEN MIOMBO WOODLAND/SAVANNA WITH CROPS
115 OPEN MIOMBO WOODLAND
116 SUDANIAN WOODLAND/SAVANNA
117 DEGRADED FOREST/GRASSLAND SAVANNA
118 OPEN MIOMBO WOODLAND, SAVANNA
119 OPEN MIOMBO WOODLAND/BUSHLAND
120 OPEN MIOMBO WOODLAND WITH CROPS
121 OPEN MIOMBO WOODLAND
122 SEMI-DECIDUOUS FOREST
123 TROPICAL RAINFOREST
124 SCLEROPHYLLOUS SUBTROPICAL FOREST
125 TROPICAL RAINFOREST
126 TROPICAL RAINFOREST
127 SCLEROPHYLL FOREST WITH CROPS
128 SECONDARY TROPICAL FOREST
129 TROPICAL RAINFOREST WITH SAVANNA
130 TROPICAL RAINFOREST WITH SAVANNA
131 TROPICAL RAINFOREST
132 TROPICAL RAINFOREST
133 TROPICAL RAINFOREST WITH SAVANNA
134 TROPICAL RAINFOREST
135 MONTANE EVERGREEN FOREST
136 TROPICAL FOREST/MIOMBO WOODLAND
137 MONTANE EVERGREEN FORESTS
138 TROPICAL RAINFOREST
139 TROPICAL FOREST
140 SECONDARY TROPICAL FOREST
141 TROPICAL RAINFOREST
142 FRAGMENTED TROPICAL FOREST
143 TROPICAL RAINFOREST
144 HUMID TROPICAL FOREST
145 TROPICAL FOREST WITH SEMI-DECIDUOUS ELEMENT
146 TROPICAL FOREST/MIOMBO WOODLAND
147 TROPICAL RAINFOREST
148 MONTANE EVERGREEN FOREST
149 DENSE TROPICAL RAINFOREST
150 DENSE TROPICAL RAINFOREST
151 MONTANE EVERGREEN FOREST
152 TROPICAL FOREST, MIOMBO WOODLAND
153 DENSE TROPICAL RAINFOREST
154 TROPICAL FOREST WITH SEMI-DECIDUOUS ELEMENT
155 SCLEROPHYLLOUS FOREST/GRASSLAND MOSAIC
156 BUSHLAND/GRASSLAND MOSAIC
157 TROPICAL FOREST/GRASSLAND
158 WOODY SAVANNA
159 DEGRADED FOREST WITH GRASSLAND
160 TROPICAL FOREST/GRASSLAND MOSAIC
161 DEGRADED TROPICAL FOREST
162 DEGRADED TROPICAL SAVANNA WITH CROPLAND
163 OPEN MIOMBO WOODLAND WITH GRASSLAND
164 TREE SAVANNA
165 TREE SAVANNA
166 MIOMBO WOODLAND
167 DEGRADED FOREST/SAVANNA WITH CROPLAND
168 DEFORESTED SAVANNA WITH CROPS
169 DEGRADED TROPICAL RAINFOREST
170 TROPICAL FOREST/GRASSLAND WITH CROPLAND
171 TROPICAL FOREST/GRASSLAND WITH CROPLAND
172 DEGRADED TROPICAL FOREST
173 MIOMBO WOODLAND
174 HIGH DENSITY SUDANIAN WOODLAND
175 DEFORESTED SAVANNA/MIOMBO WOODLAND
176 DENSE SUDANIAN WOODLAND WITH GRASSLAND
177 TROPICAL RAINFOREST/GRASSLAND MOSAIC
178 MIOMBO WOODLAND/TROPICAL FOREST
179 DEGRADED TROPICAL FOREST
180 MIOMBO WOODLAND WITH CROPLAND
181 TROPICAL FOREST, MIOMBO WOODLAND
182 MIOMBO WOODLAND WITH CROPLAND
183 DEGRADED FOREST SAVANNA WITH CROPLAND
184 DEGRADED LOWLAND FOREST/SAVANNA
185 DEGRADED FOREST WITH CROPS
186 DEGRADED TROPICAL FOREST/SUDANIAN WOODLAND
187 HERBACEOUS WETLANDS (SUD)
188 HERBACEOUS WITH WOODY WETLANDS (OKAVANGA SWAMP)
189 MANGROVES/SWAMPS, TROPICAL FOREST
190 MANGROVES/SWAMPS, TROPICAL FOREST
191 MANGROVES
192 MANGROVES/TROPICAL FOREST
193 BARREN OR SPARSELY VEGETATED
194 SAHARA/SAHEL SPARSELY VEGETATED
195 BARREN OR SPARSELY VEGETATED
196 SAHARA/N. SAHEL SPARSELY VEGETATED
197 WATER
Value Description
1 Urban
2 Low Sparse Grassland
3 Coniferous Forest
4 Deciduous Conifer Forest
5 Deciduous Broadleaf Forest
6 Evergreen Broadleaf Forests
7 Tall Grasses and Shrubs
8 Bare Desert
9 Upland Tundra
10 Irrigated Grassland
11 Semi Desert
12 Glacier Ice
13 Wooded Wet Swamp
14 Inland Water (see Note 1)
15 Sea Water (see Note 1)
16 Shrub Evergreen
17 Shrub Deciduous
18 Mixed Forest and Field
19 Evergreen Forest and Fields
20 Cool Rain Forest
21 Conifer Boreal Forest
22 Cool Conifer Forest
23 Cool Mixed Forest
24 Mixed Forest
25 Cool Broadleaf Forest
26 Deciduous Broadleaf Forest
27 Conifer Forest
28 Montane Tropical Forests
29 Seasonal Tropical Forest
30 Cool Crops and Towns
31 Crops and Town
32 Dry Tropical Woods
33 Tropical Rainforest
34 Tropical Degraded Forest
35 Corn and Beans Cropland
36 Rice Paddy and Field
37 Hot Irrigated Cropland
38 Cool Irrigated Cropland
39 Cold Irrigated Cropland
40 Cool Grasses and Shrubs
41 Hot and Mild Grasses and Shrubs
42 Cold Grassland
43 Savanna (Woods)
44 Mire, Bog, Fen
45 Marsh Wetland
46 Mediterranean Scrub
47 Dry Woody Scrub
48 Dry Evergreen Woods
49 Volcanic Rock
50 Sand Desert
51 Semi Desert Shrubs
52 Semi Desert Sage
53 Barren Tundra
54 Cool Southern Hemisphere Mixed Forests
55 Cool Fields and Woods
56 Forest and Field
57 Cool Forest and Field
58 Fields and Woody Savanna
59 Succulent and Thorn Scrub
60 Small Leaf Mixed Woods
61 Deciduous and Mixed Boreal Forest
62 Narrow Conifers
63 Wooded Tundra
64 Heath Scrub
65 Coastal Wetland, NW
66 Coastal Wetland, NE
67 Coastal Wetland, SE
68 Coastal Wetland, SW
69 Polar and Alpine Desert
70 Glacier Rock
71 Salt Playas
72 Mangrove
73 Water and Island Fringe
74 Land, Water, and Shore (see Note 1)
75 Land and Water, Rivers (see Note 1)
76 Crop and Water Mixtures
77 Southern Hemisphere Conifers
78 Southern Hemisphere Mixed Forest
79 Wet Sclerophylic Forest
80 Coastline Fringe
81 Beaches and Dunes
82 Sparse Dunes and Ridges
83 Bare Coastal Dunes
84 Residual Dunes and Beaches
85 Compound Coastlines
86 Rocky Cliffs and Slopes
87 Sandy Grassland and Shrubs
88 Bamboo
89 Moist Eucalyptus
90 Rain Green Tropical Forest
91 Woody Savanna
92 Broadleaf Crops
93 Grass Crops
94 Crops, Grass, Shrubs
Note 1: In Version 1.2, all water is mapped to one digital value (14).
Value Description
1 Evergreen Needleleaf Forest
2 Evergreen Broadleaf Forest
3 Deciduous Needleleaf Forest
4 Deciduous Broadleaf Forest
5 Mixed Forest
6 Closed Shrublands
7 Open Shrublands
8 Woody Savannas
9 Savannas
10 Grasslands
11 Permanent Wetlands
12 Croplands
13 Urban and Built-Up
14 Cropland/Natural Vegetation Mosaic
15 Snow and Ice
16 Barren or Sparsely Vegetated
17 Water Bodies
4.4 USGS Land Use/Land Cover System Legend (Modified Level 2)
Value Code Description 1 100 Urban and Built-Up Land 2 211 Dryland Cropland and Pasture 3 212 Irrigated Cropland and Pasture 4 213 Mixed Dryland/Irrigated Cropland and Pasture 5 280 Cropland/Grassland Mosaic 6 290 Cropland/Woodland Mosaic 7 311 Grassland 8 321 Shrubland 9 330 Mixed Shrubland/Grassland 10 332 Savanna 11 411 Deciduous Broadleaf Forest 12 412 Deciduous Needleleaf Forest 13 421 Evergreen Broadleaf Forest 14 422 Evergreen Needleleaf Forest 15 430 Mixed Forest 16 500 Water Bodies 17 620 Herbaceous Wetland 18 610 Wooded Wetland 19 770 Barren or Sparsely Vegetated 20 820 Herbaceous Tundra 21 810 Wooded Tundra 22 850 Mixed Tundra 23 830 Bare Ground Tundra 24 900 Snow or Ice
4.5 Simple Biosphere Model Legend
Value Description
1 Evergreen Broadleaf Trees
2 Broadleaf Deciduous Trees
3 Deciduous and Evergreen Trees
4 Evergreen Needleleaf Trees
5 Deciduous Needleleaf Trees
6 Ground Cover with Trees and Shrubs
7 Groundcover Only
8 Broadleaf Shrubs with Perennial Ground Cover
9 Broadleaf Shrubs with Bare Soil
10 Groundcover with Dwarf Trees and Shrubs
11 Bare Soil
12 Agriculture or C3 Grassland
17 Persistent Wetland
18 Dry Coastal Complexes
19 Water
20 Ice Cap and Glacier
4.6 Simple Biosphere 2 Model Legend
Value Description
1 Broadleaf Evergreen Trees
2 Broadleaf Deciduous Trees
3 Broadleaf and Needleleaf Trees
4 Needleleaf Evergreen Trees
5 Needleleaf Deciduous Trees
6 Short Vegetation/C4 Grassland
7 Shrubs with Bare Soil
8 Dwarf Trees and Shrubs
9 Agriculture or C3 Grassland
10 Water, Wetlands, Ice/Snow
4.7 Biosphere-Atmosphere Transfer Scheme Legend
Value Description
1 Crops, Mixed Farming
2 Short Grass
3 Evergreen Needleleaf Trees
4 Deciduous Needleleaf Tree
5 Deciduous Broadleaf Trees
6 Evergreen Broadleaf Trees
7 Tall Grass
8 Desert
9 Tundra
10 Irrigated Crops
11 Semidesert
12 Ice Caps and Glaciers
13 Bogs and Marshes
14 Inland Water
15 Ocean
16 Evergreen Shrubs
17 Deciduous Shrubs
18 Mixed Forest
19 Interrupted Forest
20 Water and Land Mixtures
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