Remote Sensing Applications

1
Remote Sensing Applications

• THE OCEANS
• Sea Floor Mapping

2
(No Transcript)
3
Remote Sensing Applications

• Sea Floor Mapping
• Total reflection surface reflectance Water
  Column Emittance

4
Remote Sensing Applications

• Sea Floor Mapping
• Rt Rs We
• Remove surface reflectance gt Water Column
  Emittance
• Normally approximated by subtraction of IR band
• Since Weir 0 and Rs is independent of
  wavelength,
• Band1 - IR band Water Column Emittance

5
(No Transcript)
6

• Water Column Emittance approximated by
  subtraction of IR Band

7
(No Transcript)
8
Remote Sensing Applications

• Sea Floor Mapping
• Water Column Emittance Bottom Reflection
  Water Column Reflection
• Water Column Reflectance Water quality X depth

9
Results Snug Beach
10
Results Margate Marina
11
Imagery and classifications
12
E Rw Rb/D. kAw
13
E1 Rw1 Rb1/D. kAw1 E2 Rw2 Rb2/D. kAw2 E3
Rw3 Rb3/D. kAw3 and so on..
14
Remote Sensing Applications

• Sea Floor Mapping
• Water Column Reflectance Water quality X depth
• To unmix bottom variations from depth
• Need to find water attenuation Coefficent
• Need know either depth or bottom reflectance

15
Remote Sensing Applications
16
(No Transcript)
17
(No Transcript)
18
(No Transcript)
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24
(No Transcript)
25
E1/ E2 Rb1 . kAw2 / Rb2. kAw1 E1/ E2 k(Rb1 /
Rb2)
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)
32
(No Transcript)
33
Conclusion

• Problems
• Coefficient of absorption is never known with
  precision
• Water quality can (and will) vary across the
  image
• Difficult to quantify bottom reflectance
• Unmixing still remains a problem
• The variables are not independent but
• Interact in complex ways.
• Applications
• Environmental survey
• Updating very mobile areas