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Remote Sensing is a broad term for a variety of methods for collecting data from a given area of the Earth through mechanical, electronic and optic means that require no direct contact. The aim of such sensing is to detect, identify and track certain types of targets – for the purpose of preservation activities, research, science and optimal utilization of resources (in fields such as agriculture, measuring air pollution rates and even discovering oil), as well as for military objectives. One of the challenges of Remote Sensing from space is to cover as large an area as possible in the least amount of time, and to collect maximum information from the measured area. Another challenge is to match the sensor to the type of object or area that is to be monitored. Sensing can be passive (absorption of reflected light) or active (based on the sensing equipment illuminating the measured area, such as via Synthetic Aperture Radar). Issue: February 2021 To all philatelic items issued on February 2021
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