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Image Processing
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A Reflectance Retrieval Algorithm For Landsat Tm Satellite Image
Acknowledgment
This work is supported by both post-doctoral scholarship from Ministry of Education of Taiwan and NSF LTER project of US.
References
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Table 1. Comparison of image-derived aerosol optical depths (with / without iterated) and their errors
êt to the field-measurement (AERONET) in TM1 and TM3 bands. High
êt in TM1 band from iterated method is due to the abnormally high image-derived n which is also listed. HI, MD are abbreviations of Hog-Island and Madison sites respectively. Mean errors of retrieved t by iterated method are 0.25 and 0.12 in TM1 and TM3 bands as well as 0.14 and 0.05 by non-iterated method, respectively.
| Site-Date
| Field
Measurement
| êT
|
| Iterationa
| No Iterationb
| TMSACd
|
| TM1
| TM3
| TM1
| TM3
| 0
| TM1
| TM3
| TM1
| TM3
|
| HI-12jul93
| 0.69
| 0.43
| -0.25
| -0.19
| 4.0
| 0.09
| -0.02
| -0.08
| 0.06
|
| HI-28jul93
| 0.25
| 0.15
| 0.36
| -0.03
| 7.2
| 0.19
| -0.03
| 0.11
| 0.01
|
| MD-22jun95
| 0.56
| 0.25
| -0.14
| -0.14
| 4.0
| 0.13
| 0.1
| 0.11
| 0.14
|
a is the iterative procedure by iterating the Junge parameter
uwith initial
u=3.0 (Liu et al. 1996).
b uis set to 3.3 which corresponds to continental model.
c derived aerosol optical depth is the average value of the central four blocks. See table 2 and context.
d r7/ r1=2.4,
r7/ r
3=1.35 for pixels selected
r7=[0.015,0.05] (see context).
Table 2. Retrieved aerosol optical depths in TM1 and TM3 bands for every block of MD-22jun95 image which contains non-uniform aerosol effect. Values in parenthesis are (t(TM1), t(TM3)) respectively.
| (0.62,0.29) |
(0.62,0.29) |
(0.64,0.37) |
(0.64,0.37) |
| (0.64,0.33) |
(0.64,0.33) |
(0.66,0.33) |
(0.64,0.33) |
| (0.74,0.45) |
(0.70,0.37) |
(0.70,0.37) |
(0.72,0.37) |
| (0.82,0.49) |
(0.84,0.53) |
(0.82,0.49) |
(0.82,0.49) |
Figure 1. The apparent and surface reflectance spectra of bare soil and vegetation extracted from the very hazy part (visibility~5km) of MD-22jun95 scene.
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