After adding PROBA-V and Copernicus Global Land data, we now also offer Sentinel-1 data via our online EO browser Terraviewer. View, compare and export Sentinel-1 images via the new and improved version of Terraviewer.
The Sentinel-1 satellites use RADAR to visualize the Earth. RADAR makes it possible to record data during cloudy days as well as during the night. Most places in Belgium are displayed every 2-3 days. We show a color image that contains the RADAR reflection in two polarizations
• The red channel contains the Vertical-Vertical (VV) reflection
• The green channel contains the Vertical-Horizontal (VH) reflection
• The blue channel contains the ratio between VV / VH
Most water surfaces (and other flat surfaces, such as airport runways and runways) turn blue because the RADAR reflection is low (it is absorbed by water and reflected off by flat surfaces). You see built-up areas in yellow hues, indicating that VV and VH reflections are about the same size. Forests are usually gray because they reflect the RADAR radiation in all directions. Metal objects are good reflectors, which is why the wind power parks and ships in the North Sea are very clearly visible (to see this, turn off the street overlay at the bottom of the "Layers" panel).