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Calibration Result of JAXA standard products (As of March 29, 2007)


PRISM Level 1B2 data products

- Radiometric Accuracy
 1) Relative Accuracy
  Better than 0.4 % (better than 1DN) (RMS): Vertical streaking stripes may appear in some of the images with similar characteristics.

 2) Absolute Accuracy
  Better than 4.6 % (RMS)

- Geometric Accuracy
 1) Absolute Accuracy
 
Error in pixel direction
(cross track)
Error in line direction
(along track)
Forward view (RMS)
11 m
21 m
Nadir view (RMS)
8 m
9 m
Backward view (RMS)
10 m
20 m
  Absolute accuracy is defined as the RMS error; no reference is made to Ground Control Points (GCP).

 Note: The above accuracy is estimated from six scenes of data covering 331 GCPs. Estimation results based on imagery acquired in the future will be shown in due course.

 2) Relative Accuracy
 
Error in pixel direction
(cross track)
Error in line direction
(along track)
 
Std. dev. in a scene(1σ)
4 m
3 m
for all three kinds of views



AVNIR-2 Level 1B2 data products

- Radiometric Accuracy
 1) Relative Accuracy
  Better than 0.4% (better than 1DN) (RMS)

 2) Absolute Accuracy
  Band 1: better than 3.8% (RMS)
  Band 2: better than 4.6% (RMS)
  Band 3: better than 2.2% (RMS)
  Band 4: better than 15.6% (RMS): Atmospheric influence accounts for the error as much as 50%.

- Geometric Accuracy (for all pointing angles)
 1) Absolute Accuracy
 
Error in pixel direction
(cross track)
Error in line direction
(along track)
RMS
106 m
19 m
Absolute accuracy is defined as the RMS error; no reference is made to Ground Control Points (GCP).

 2) Relative Accuracy
 
Error in pixel direction
(cross track)
Error in line direction
(along track)
Std. dev. in a scene(1σ)
4 m
4 m



PALSAR Level 1.1/1.5 data products

- Radiometric Accuracy (for all off-nadir angles)
Absolute Gain
0.64dB(1σ)
Noise Equivalent Backscattering Coefficient
-34dB
VV/HH Gain Ratio (PLR)
0.02dB(0.004dB:1σ)
VV/HH Phase Difference (PLR)
0.32deg(1.01deg:1σ)
Cross talk (PLR)
more than 31dB
Resolution Azimuth Direction (single look)
4.49m
Range Direction (FBD, PLR, and DSN)
9.6m(FBD, PLR, DSN)
Range Direction (FBS)
4.8m(FBS)
Sidelobe Azimuth Direction
-16dB
Range Direction
-12.5dB
Two-Dimensional Direction
-8.6dB

- Ambiguity
Range Direction
23dB
Azimuth Direction
unmeasurable

- Geometric Accuracy (for all off-nadir angles)
RMS 9.3m
FBS, FBD, PLR
RMS 70m
WB1, WB2



<Evaluation Method>

- Radiometric Accuracy of PRISM/AVNIR-2
 Compared with TERRA/AQUA MODIS data (over Desert, Ocean, etc.)

- Geometric Accuracy of PRISM/AVNIR-2
 Compared with GCPs (CAL/VAL sites) considering target height

- Radiometric Accuracy of PALSAR
 Analyzed data from Corner Reflectors (CAL/VAL sites) and uniform forests over Amazon

- Geometric Accuracy of PALSAR
 Compared with GPS measured data of Corner Reflectors (CAL/VAL sites) considering target height



<Future Improvement>

- Examination on PRISM vertical streaking stripes will continue.
Efforts to improve vertically striped PRISM images will continue. The stripes, observed as vertical lines of different brightness, will appear in images brighter or darker on the whole.

- Geometric accuracy estimation of PRISM/AVNIR-2 will continue.
Absolute position accuracy evaluation based on the accumulated image data is being conducted. The accuracy may improve.
Estimation results based on imagery acquired in the future will be shown in due course.

- Aging property of absolute radiometric accuracy evaluation
Monitor the variation of absolute brightness to update the correction coefficients.



<Previous Calibration Result>

Initial Calibration Result of JAXA standard products(As of October 23, 2006)
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