Comparison: Curvature Plan vs Curvature Profile23/08/2023Curvature derived from digital elevation models (DEMs) is a measure of the shape of the Earth's surface. It can be used to identify areas that… READ MORE
Comparison: Height Above Nearest Drainage (HAND) vs Flood Hazard Index (FHI)27/09/2023Derivatives of digital elevation models are ideal for identifying flood-prone areas. For instance, the height above nearest drainage (HAND) derivative shows the height difference between… READ MORE
Comparison: Satellite Imagery (1)03/05/2023We like to give credit where it's due, and in this case it goes to NGI. The aerial photography provided by the Chief Directorate: National… READ MORE
Comparison: Satellite Imagery (2)05/07/2023Our DEMSA 2 product, a digital elevation model at 2m resolution, is being used for a range of applications (including signal propagation modelling for 5G… READ MORE
Definition: Hydrology and Hydraulics29/11/2023Hydrology is the study of the distribution and movement of water on the Earth's surface and in the subsurface. Hydrologists use mathematical models to simulate… READ MORE
Definition: Terrain Analysis26/07/2023Terrain Analysis is a powerful tool that can be used to better understand the Earth's surface and its potential impacts on human activities. Moreover, as… READ MORE
Five Ways to Depict Elevation10/11/2023A digital elevation model (DEM) is merely an image where each pixel represents the average height above mean sea level for the area that it… READ MORE
Interpolation and Photogrammetric Elevation Derivation in South African Digital Elevation Models20/08/2026A technical comparison of SUDEM5 and DEMSA2 within the GeoSmart Space elevation-data framework Prepared as an academic overview, August 2026 READ MORE
Planet Picture: Meta River19/07/2023The Meta River forms part of the border between Colombia and Venezuela. In this picture, however, it can easily be confused with an artery in… READ MORE
Planet Picture: Mississippi River07/06/2023The "mighty Mississippi", as it's fondly called, is the largest river system in North America. The river passes through or borders the states of Arkansas,… READ MORE
