Table 1 |
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Description of various data and their sources used as input into the development travel time to the public health facilities in northern Namibia. |
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Map Layer |
Description |
Classification |
Speed (km/h) |
Model |
|
|
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|
Land use/land cover |
Spatial representation of all different land use and land cover types. Two land cover grids were processed (1) basic land cover grid (2) combined grid that incorporates roads and rivers with same resolution as the DEM |
Tree cover, broad leaved deciduous or evergreen |
5 |
WALKING |
|
Tree cover, needle leaved, deciduous or evergreen |
5 |
WALKING |
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|
Tree cover, other |
2 |
WALKING |
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|
Shrub cover |
5 |
WALKING |
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|
Herbaceous cover |
3 |
WALKING |
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|
Sparse herbaceous |
4 |
WALKING |
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|
Cultivated and managed areas |
5 |
WALKING |
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|
Bare areas/desert |
2 |
WALKING |
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|
Water Bodies |
0 |
NONE |
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|
|
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|
Roads |
Classified into three broad categories; Primary roads (class A), Secondary roads (class B); Tertiary roads (class C). Each road class was assigned a slightly different speed. |
Primary roads |
80 |
NONE |
|
Secondary roads |
60 |
NONE |
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|
Tertiary roads |
10 |
CYCLING |
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|
|
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|
Rivers |
GIS layer representing barrier to movement. Only major rivers were used to reduce the complexity of running the algorithms |
NA1 |
0 |
NA1 |
|
|
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|
Digital elevation model |
Altitude values that are used in anisotropic calculation; Original DEM 30 m ASTER grid; resampled to 100 m pixel size |
Degree of Slope (< 0.5°) |
4.88 |
WALKING |
|
Degree of Slope (5.0°) |
3.71 |
WALKING |
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|
Degree of Slope (10.0°) |
2.71 |
WALKING |
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|
Degree of Slope (20.0°) |
1.41 |
WALKING |
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|
Degree of Slope (30.0°) |
0.66 |
WALKING |
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|
|
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The assumed travel speeds for each input feature are also shown 1. NA is an abbreviation for ' Not Applicable' |
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Alegana et al. International Journal of Health Geographics 2012 11:6 doi:10.1186/1476-072X-11-6 |
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