1. Remote Sensing Electromagnetic Radiation

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 - interpretation and analysis

5. Remote Sensing Processes..

6. ► Data analysis: - data processing - compilation - application ► “DIKI” datainformationknowledgeintelligence

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 ( ) ► Frequency ( ) ► Amplitude

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

12. Frequency ( ) ► 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 = ► The speed of EM energy c 300,000km/second, c =   and  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  h ► 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  h ► 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