1 / 22

Remote Sensing Electromagnetic Radiation

Remote Sensing Electromagnetic Radiation. Remote Sensing Definition. "I want to know how God created this world. I am not interested in this or that phenomenon, in the spectrum of this or that element. I want to know His thoughts; -the rest are details.“ Albert Einstein.

fidella
Download Presentation

Remote Sensing Electromagnetic Radiation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Remote SensingElectromagneticRadiation

  2. Remote Sensing Definition "I want to know how God created this world. I am not interested in this or that phenomenon, in the spectrum of this or that element. I want to know His thoughts; -the rest are details.“ Albert Einstein

  3. Remote Sensing Definition • Science and art of obtaining information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in contact with object, area, or phenomenon.

  4. Remote Sensing Processes • Data acquisition         - energy sources         - energy through the atmosphere         - interaction with surface features         - retransmission         - sensor systems         - data - interpretation and analysis

  5. Remote Sensing Processes ..

  6. Remote Sensing Processes .. • Data analysis:         - data processing         - compilation         - application • “DIKI” data information knowledge intelligence

  7. Electronic Radiation • The sun produces a full spectrum of electromagnetic radiation http://csep10.phys.utk.edu/astr162/lect/light/spectrum.html http://kr.blog.yahoo.com/bmw26z/2188

  8. Two Components of EM Radiation • Electrical field (E): varies in magnitude in a direction perpendicular to the direction of propagation •  Magnetic field (M): at right angle to the electrical field, is propagated in phase with the electrical field

  9. Components of EM Radiation v

  10. Three Properties of EM Energy • Wavelength (l) • Frequency (n) • Amplitude

  11. Wavelength (l) • The distance from one wave crest to the next • Measurement units: micrometer (mm)  1m = 1,000 mm, 1mm = 1,000microm

  12. Frequency (n) • The number of crests passing a fixed point  in a given period of time • Measure units: hertz (cycle per second) 

  13. Amplitude • The height of each peak • Measured as watts per square meter (energy level)

  14. Three Properties • Among the three properties, wavelength is the most commonly used in the field of remote sensing

  15. Three Properties ..

  16. Speed of EM • The speed of EM energy  c  300,000km/second,   c = nl • l and n are inversely related

  17. Electromagnetic Spectrum • Spectrum of electromagnetic radiation • Major divisions of EM spectrum http://csep10.phys.utk.edu/astr162/lect/light/spectrum.html http://imagers.gsfc.nasa.gov/ems/ems.html

  18. Major Divisions of EM Spectrum • Ultraviolet spectrum: 0.3 - 0.38microm •  Visible spectrum:         - blue  0.4 - 0.5microm         - green 0.5 - 0.6microm         - red   0.6 - 0.72microm • 1m = 1,000mm = 1,000,000 micrometer

  19. Major Divisions of EM Spectrum • Infrared spectrum:         - near infrared: 0.72 - 1.3microm         - mid infrared:  1.30 - 3.0microm         - far infrared:  7.00 - 15microm, emitted from the earth • Microwave spectrum: 1mm - 1m

  20. The Dual Nature of Light (Newton) • Light is formed by a stream of quanta (photons) that travels in straight line. The size of each quantum is directly proportional to the frequency of the energy's radiation                     Q = hn • The quantum model best explains the photoelectric effect

  21. The Dual Nature of Light • EM energy propagates as a series of waves • The wave model best explains the refraction and diffraction

  22. Readings • Chapter 1

More Related