Earth remote sensing
Earth remote sensing (ERS) — is data collection on the environment, geology, climate, and other characteristics of the Earth by means of sensors positioned in the air or in Earth orbit. There are two kinds of remote sensing. Passive sensors detect natural radiation that is emitted or reflected by the object or surrounding area being observed. Reflected sunlight is the most common source of radiation measured by passive sensors. Active collection, on the other hand, emits energy in order to scan objects and areas whereupon a sensor then detects and measures the radiation that is reflected or backscattered from the target, such as radar.
Remote sensing data is the primary source for thematic and topographic mapping. CRS and GIS “Terra” uses both archival and contemporary remote sensing data. Depending on research task the high-resolution, mid-resolution, low resolution data or the hyper spectral data are applied.