Interband calibration with PROBA-V

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Presentation transcript:

Interband calibration with PROBA-V Stefan Adriaensen (VITO) 2nd GSICS/CEOS Lunar Calibration Workshop, Xi’an, China 13/11/20117 – 16/11/20117

PROBA-V instrument No active thermal control No on-board calibration lamp No solar diffuser Design complexity 3 Cameras 2 focal planes: VNIR with 3 bands SWIR with 1 band but staggered strips

Oceans DC Clouds Deserts Absolute Interband Temporal Inter-pixel PROBA-V Calibration OSCAR* (Optical Sensor Calibration with simulated Radiances) Relies on combination of various vicarious calibration methods to reduce uncertainty in the calibration results and to verify the different requirements Absolute Oceans Interband DC Clouds Antarctica Greenland Inter-pixel Yaw steering maneuver Temporal Deserts *Sterckx et al. IJRS, 2014; Sterckx et al. , TGARS, 2013; Govaerts et al., RSL, 2013

DCC interband calibration Interband stability and calibration covered with DCC method Requirement 3% interband stability RED band is used to retrieve COT using libRadtran TOA radiances are then retrieved for BLUE and NIR Only VNIR bands are covered by the method : BLUE / RED NIR / RED

DCC Results : 2015-2017 CENTER BLUE NIR

BLUE and NIR / RED VITO LUNAR MODEL : 2014-2017

BLUE and NIR / RED VITO LUNAR MODEL : 2014-2017

BLUE and NIR / RED GIRO : 2014-2017

BLUE and NIR / RED GIRO : 2014-2017

Conclusion Lunar interband calibration is not implemented as operational calibration method Current results show accepable values within requirements It has the potential : adding confident to the current calibration method DCC expanding interband to SWIR