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Fundamentals of Remote Sensing

Fundamentals of Remote Sensing. Gathering information without physical contact. Can you sense things remotely?. Remote sensing may be accomplished in any of several ways. Close up. Caroline Wicks. Further away. A LOT further away. Organic content of soil.

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Fundamentals of Remote Sensing

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  1. Fundamentals of Remote Sensing Gathering information without physical contact

  2. Can you sense things remotely?

  3. Remote sensing may be accomplished in any of several ways Close up Caroline Wicks Further away A LOT further away

  4. Organic content of soil

  5. Take a set of readings on the white background Take a set of readings of Soil Sample 1 Divide Soil readings by white readings and multiply by 100 Repeat with Soil Sample 2 Graph your percentages vs. wavelength

  6. 1. Graph percent reflectance of soil 1 vs. wavelength. 2. Connect points with a solid line. 3. Graph percent reflectance of soil 2 vs. wavelength. 4. Connect points with a dotted line. 5. Make a legend.

  7. Soils rich in organics have lower reflectances

  8. So, why can’t we just use our eyes? • Oil or Algae? • How do you know?

  9. They don’t tell the whole story! Red Tide (Algal Bloom) Oil Spill

  10. Polar Orbiting Earth SatellitePOES

  11. Geostationary Orbiting Earth Satellites(GOES)

  12. POES

  13. GOES Photo: ESA

  14. Electromagnetic Energy

  15. SeaWiFS Instrument Package • Sea-viewing Wide Field of view Satellite • Carried on the satellite “Seastar” • Senses visible and NIR (near infra-red) • Ocean Color

  16. TOPEX/Poseidon

  17. Jason

  18. RADAR = RAdio Detection And Ranging

  19. TOPEX/POSEIDON Satellite Altimetry

  20. AVHRRAdVancedHigh Resolution Radiometer

  21. True-Color Imagery Land Clouds Water

  22. Stream Sediments Chesapeake Bay

  23. Brazil Rainforest Ex-Rainforest

  24. Try interpreting some satellite images

  25. Try interpreting some satellite images

  26. Temperature A 21 20 3 4 2 1 20 22 32 28 26 28 5 7 8 6 28 30 26 27 B B A

  27. 20 21 22 20 26 28 28 32 26 27 28 30

  28. Using the IR Thermometer • DO NOT point the thermometer at another person. • Point at target and pull trigger. • Release and record the temperature in the appropriate spot on the recording grid. • Record about 4 temperatures per grid area. • Return to your seat and “color” mapping grid. Be sure to include a legend of colors.

  29. Transpiration cools leaves

  30. RADARSAT uses microwaves

  31. Passive or Active?

  32. Passive or Active?

  33. Remote Sensing Techniques Continuing to Evolve

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