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
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
Planet Picture: Namib-Naukluft, Namibia28/02/2024You might be wondering what you're looking at. Well, it's just an aerial view of the tallest sand dunes in the world! The coastal winds… READ MORE
