The Eye of Sahara
In Mauritania, hidden deep into the great Sahara desert, there is a huge and mysterious geologic formation that is hard to spot from ground level, walking around on Earth. It turns out that we really discovered this incredible bull’s-eye in the sand only when we began sending humans into space when the Gemini IV mission (1965), a
Top of Atmosphere Reflectance on Sentinel 3
Top of Atmosphere (TOA) Reflectance is a unitless measurement which provides the ratio of radiation reflected to the incident solar radiation on a given surface. It that can be computed from satellite measured spectral radiance using the mean solar spectral irradiance and the solar zenith angle. When comparing EO images from different sensors, there are two