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Calibration Result of JAXA standard products (As of July 1, 2009)


PRISM Level 1B2 data products

  • Geometric calibration accuracy: Observation date from Jun. 22, 2007 to Jun. 4, 2009
    1. 1) Absolute accuracy
    2.   Pixel direction
      (cross track)
      Line direction
      (along track)
      Distance No of GCPs No of Scenes
      Nadir view (RMS) 5.6 m 5.3 m 7.8 m 5,499 586
      Forward view (RMS) 4.9 m 6.1 m 7.8 m 1,771 225
      Backward view (RMS) 5.0 m 7.1 m 8.7 m 4,839 525

      - Measurements: Statistical evaluation of the worldwide ground control points (GCPs) and calculation of the root mean square (RMS) of the distance between the position of GCPs, that were identified in the each PRISM image and obtained from the coordination conversion formula, and their true location on the GRS 80 that were calculated from the GCPs true measurement by GPS and the PRISM observation geometry.

      - For reference: CE90
      Nadir view: 11.8 m, Forward view: 12.4 m, Backward view: 13.4 m

    3. 2) Relative accuracy (three radiometers)
    4.   Pixel direction Line direction Distance
      Std. dev. in a scene(1σ) 1.4 m 1.8 m 2.4 m

      - Measurements: Averaged value of standard deviation of geometric errors in a scene in evaluating absolute accuracy.

  • - Radiometric calibration accuracy
    1. 1) Absolute accuracy (Nadir-looking radiometer)

    2. Similar to that of AVNIR-2 (better than 3%, RMS)
      - Measurements: Compared with calibrated AVNIR-2 as cross calibration over deserts, salt lakes, ocean etc.

    3. 2) Relative Accuracy (three radiometers)

    4. Better than 0.4 % (better than 1DN) (RMS)

    Reference: T. Tadono, M. Shimada, H. Murakami, and J. Takaku, "Calibration of PRISM and AVNIR-2 Onboard ALOS "Daichi"," IEEE Trans. Geoscience and Remote Sensing, Vol. 47, No. 12, pp.4042-4050, Dec. 2009.


AVNIR-2 Level 1B2 data products

  • Geometric calibration accuracy
    1. 1) Absolute Accuracy
    2.   Pixel direction
      (cross track)
      Line direction
      (along track)
      Distance
      0 deg. pointing angle (RMS) 71.1 m 7.5 m 71.9 m
      +/-41.5deg. pointing angles (RMS) 60.9 m 96.6 m 114.2 m

      - Measurements: Statistical evaluation of the worldwide GCPs in total 1,035 points in 54 scenes and calculation of the RMS of the distance between the position of GCPs, that were identified in the each AVNIR-2 image and obtained from the coordination conversion formula, and their true location on the GRS 80 that were calculated from the GCPs true measurement by GPS and the AVNIR-2 observation geometry.

    3. 2) Relative Accuracy
    4.   Pixel direction Line direction Distance
      Std. dev. in a scene(1σ) 3.4 m 7.7 m 8.5 m

      - Measurements: Averaged value of standard deviation of geometric errors in a scene in evaluating absolute accuracy.

  • - Radiometric calibration accuracy
    1. 1) Absolute accuracy
    2. Band 1 to 3: 3% (RMS)
      Band 4: 7% (RMS)

      - Measurements: Compared with calibrated MODIS instruments onboard TERRA and AQUA satellites as cross calibration over deserts, salt lakes, snow and ice fields, ocean etc.

    3. 2) Relative Accuracy (three radiometers)

    4. Better than 0.4 % (better than 1DN) (RMS)

    References: T. Tadono, M. Shimada, H. Murakami, and J. Takaku, "Calibration of PRISM and AVNIR-2 Onboard ALOS "Daichi"," IEEE Trans. Geoscience and Remote Sensing, Vol. 47, No. 12, pp.4042-4050, Dec. 2009.
    H. Murakami, T. Tadono, H. Imai, J. Nieke, and M. Shimada, "Improvement of AVNIR-2 Radiometric Calibration by Comparison of Cross-Calibration and Onboard Lamp Calibration," IEEE Trans. Geoscience and Remote Sensing, Vol. 47, No. 12, pp.4051-4059, Dec. 2009.


PALSAR level1.1/1.5Product

  • Radiometric calibration accuracy (common for all the off-nadir angles)
  • Absolute accuracy 0.76dB(1σ) : Corner reflector
    0.22dB(1σ): Amazon Forest *
    Noise equivalent sigma-naught -34dB (FBD-HV)
    -32dB (FBD-HH)
    -29dB (FBS-HH)
    Amplitude ratio of VV/HH for PLR 1.013(0.062:1σ)
    Phase difference of VV and HH for PLR 0.612deg(2.66deg:1σ)
    Cross talk (PLR) 31.7dB
    Resolution Single look in azimuth 4.49 m
    Range 9.6m (FBD, PLR, DSN)
    Range 4.8m (FBS)
    Sidelobes In azimuth -16.6dB
    In range -12.6dB
    Two-dimensional -8.6dB

    -Measurement: Statistical analysis of the impulse response of the corner reflector at the calibration site and the responses from the Amazon rainforest.
    * Standard deviation of the incidence angle dependence of the gamma-naught** measured for five off-nadirs (e.g., 9.9, 21.5, 34.3, 41.5, and 50.8 degrees).
    ** Gamma-naught: normalized radar cross section (NRCS or sigma-naught) divided by the cosine of Incidence angel

  • Ambiguity
  • Range 23dB
    Azimuth Un-measurable

  • Geometric accuracy (common for all the incidence angles)
  • 9.7 m (RMS) FBS, FBD, PLR, DSN
    70 m (RMS) WB1, WB2

    -Measurements: Statistical evaluation of the worldwide CRs in total 572 and calculation of the root sum square of the distance between the position of the Corner reflector, that is identified in the PALSAR image and obtained from the PALSAR geometric conversion formula, and its true location on the GRS80 that is calculated from the CR true measurement and the SAR observation geometry.


    Reference: M. Shimada, O. Isoguchi, T. Tadono, and K. Isono, "PALSAR Radiometric and Geometric Calibration," IEEE Trans. Geoscience and Remote Sensing, Vol. 47, No. 12, pp.3915-3932, Dec. 2009.


<Previous Calibration Results>

Calibration results of JAXA standard products (As of September 28, 2007)
Calibration results of JAXA standard products (As of March 29, 2007)
Initial calibration result of JAXA standard products (As of October 23, 2006)
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