Digital Elevation Model (DEM) from the Hydrologic Derivatives for Modeling and Analysis (HDMA) database -- Africa
Dataset Identification:
Resource Abstract:
This dataset contains the Digital Elevation Model (DEM) for Africa from the Hydrologic Derivatives for Modeling and Analysis
(HDMA) database. The DEM data were developed and distributed by processing units. There are 19 processing units for Africa.
The distribution files have the number of the processing unit appended to the end of the zip file name (e.g. af_dem_3_2.zip
contains the DEM data for unit 3-2). The HDMA database provides comprehensive and consistent global coverage of raster and
vector topographically derived layers, including raster layers of digital elevation model (DEM) data, flow direction, flow
accumulation, slope, and compound topographic index (CTI); and vector layers of streams and catchment boundaries. The coverage
of the data is global (-180, 180, -90, 90) with the underlying DEM being a hybrid of three datasets: HydroSHEDS (Hydrological
data and maps based on SHuttle Elevation Derivatives at multiple Scales), Global Multi-resolution Terrain Elevation Data 2010
(GMTED2010) and the Shuttle Radar Topography Mission (SRTM). For most of the globe south of 60 North, the raster resolution
of the data is 3-arc-seconds, corresponding to the resolution of the SRTM. For the areas North of 60, the resolution is 7.5-arc-seconds
(the smallest resolution of the GMTED2010 dataset) except for Greenland, where the resolution is 30-arc-seconds. The streams
and catchments are attributed with Pfafstetter codes, based on a hierarchical numbering system, that carry important topological
information.
Citation
Title Digital Elevation Model (DEM) from the Hydrologic Derivatives for Modeling and Analysis (HDMA) database -- Africa
other Citation Details
Cinergi keyword enhanced.File generated at Wed Dec 05 04:05:03 UTC 2018
purpose:
This dataset contains the Digital Elevation Model (DEM) for Africa from the Hydrologic Derivatives for Modeling and Analysis
(HDMA) database. This dataset is appropriate for use in continental-scale modeling effort.