Remote sensing, in the broadest sense, is the measurement or acquisition of information of some property of an object or phenomenon that is not in physical contact with the object or phenomenon under study. Remote sensing instruments, such as optical imagers or radar sensors, acquire information about an object of interest by detecting and measuring the changes that the object imposes on the surrounding electromagnetic field. For instance, in the case of visible and near-infrared (VNIR) sensors the reflected sunlight is used to acquire information about the chemical composition and physical structure of the object being observed. In the case of thermal infrared and passive microwave sensors, the emitted field is used to acquire information about the thermal properties as well as the composition of the object. In the active microwave region, information about the object’s physical structure and electrical properties is acquired by analyzing the reflected field when the sensor illuminates the object with a well-defined generated field of electromagnetic waves.
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- Reference Data and Definitions
Herbert J. Kramer
- Springer Berlin Heidelberg
- Part C
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