![]() ![]() X-rays, ultraviolet rays, visible light, infrared light, heat, microwaves, and radio and television waves are all examples of electromagnetic energy.Ī portion of the electromagnetic spectrum, ranging from wavelengths of 0.1 micrometer (a micrometer is one millionth of a meter) to one meter, within which most remote sensing systems operate. Electromagnetic radiation is a form of energy emitted by all matter above absolute zero temperature (0 Kelvin or -273° Celsius). Most remote sensing instruments measure the same thing: electromagnetic radiation. You will see that digital remote sensing is a little like scanning a paper document with a desktop scanner, only a lot more complicated. The appeal of multispectral remote sensing is that objects that are indistinguishable at one energy wavelength may be easy to tell apart at other wavelengths. Many of the objects that make up the Earth’s surface reflect and emit electromagnetic energy in unique ways. Here we consider the nature of the phenomenon that many, though not all, remote sensing systems measure: electromagnetic energy. Nature of Remotely Sensed Image Dataĭata, as you know, consist of measurements. Add comments and questions of your own, if any.Ĭomments and questions may be posted on any page of the text, or in a Chapter-specific discussion forum in ANGEL.Ĩ.3. Read comments and questionsposted by fellow students. See the Calendar tab in ANGEL for due dates. Instructions are provided for each activity.ĪNGEL > Lessons tab > Chapter 8 folder > Chapter 8 Graded Quiz.
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