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MODIS Lunar Calibration Data Preparation and Results for GIRO Testing

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Presentation on theme: "MODIS Lunar Calibration Data Preparation and Results for GIRO Testing"— Presentation transcript:

1 MODIS Lunar Calibration Data Preparation and Results for GIRO Testing
Zhipeng (Ben) Wanga and Xiaoxiong (Jack) Xiongb a: Science Systems and Applications Inc., Greenbelt, MD USA b: NASA - Goddard Space Flight Center, Greenbelt, MD USA GSICS Lunar Calibration Workshop 2014, Darmstadt, Germany

2 Outline Introduction Lunar data processing
MODIS instrument overview MODIS lunar calibration scheduling lunar image acquisition Lunar data processing background and instrument temperature correction Imagette integration method oversampling factor satellite position GIRO: data preparation and results

3 MODIS Instrument MODIS is a whisk-broom scanning spectroradiometer onboard NASA’s EOS Terra and Aqua satellites MODIS has 36 spectral bands covering a spectral range of μm; 20 are reflective solar bands (RSB) The spatial resolutions at nadir are: 250 m for bands 1-2; 500 m for bands 3-7; 1 km for bands 8-36 Sample periods: 333/4 µs, 333/2 µs, and 333 µs, respectively

4 MODIS Calibration MODIS has a set of on-board calibrators including a solar diffuser (SD), a blackbody (BB), a spectro-radiometric calibration assembly (SRCA) and a space view (SV) port A scan mirror rotates, alternately directing light from SD, SRCA, BB, SV and Earth view (EV) to the detectors The SD BRF is characterized pre-launch with NIST traceable reflectance standard

5 Scheduled Lunar Observation
Lunar calibration event is scheduled nearly monthly Lunar phases are within the range of [54º, 56º] for Terra MODIS and [-56º, -54º] for Aqua MODIS A satellite roll maneuver is needed for MODIS to observe the Moon through its SV port at the phase range 139/119 calibrations for Terra/Aqua so far, respectively Unscheduled observations through SV are also available

6 Lunar Image Acquisition
Lunar images are acquired over multiple scans The radius of lunar image: spatial resolution orientation

7 Background Correction
The background and instrument correction is applied each scan The background DN is extracted from both sides of the peripheral region of the Moon

8 Image Integration The radiance is retrieved for each pixel with the detector gain coefficients derived from other calibrators Integrate the radiance to get total lunar irradiance IMoon Integration over detectors for each scan, then take average Ω: IFOV in solid angle N: number of “center” scans m1: gain coefficient from SD f: frame/sample Integration over scans for each detector s: scan number d: detector number fOS: oversampling factor

9 Oversampling Factor fOS,250m = 0.5fOS,500m = 0.25fOS,1km Terra Aqua
The oversampling factor fOS is the number of scans it takes for a detector’s field of view to move one IFOV fOS is determined by the angular movement speed of the object in reference to FPA fOS,250m = 0.5fOS,500m = 0.25fOS,1km Event 1 Event 2 Terra Aqua

10 Satellite Position The satellite ephemeris data are predicted by NASA instrument operation team to schedule a calibration The geometric factors at the time of lunar calibration are calculated with the ephemeris TLE data can be used to verify these factors

11 GIRO Input Files The instrument spectral response function (srf) files and lunar data files in netCDF format are generated using IDL GIRO release 1 to 4 have been tested The GIRO ROLO results look good (4th release) Resolved technical issues: - the NetCDF-4 support, which is required to write channel_id in string type, is only available since IDL 8.0 - scaling factor attribute for variables dc_obs, dc_obs_offset to account for non-integer temperature corrected dn* - SWIR bands ROLO results (when srf is beyond 2.1 µm) Data processing: GIRO vs MCST - the setting of moon_pix_thld, which is actually detector dependent - the integration range for lunar irradiance calculation - detector dependent srf

12 SRF File Terra Aqua MODIS srf is measured pre-launch at detector level
The srf of mid-detector is inserted for GIRO testing Terra Aqua

13 GIRO ROLO Results 23 calibrations have been processed for Aqua

14 Summary GIRO testing is successfully performed with MODIS lunar calibration data The Aqua MODIS lunar irradiance trending, in reference to GIRO’s ROLO result, has been stable within its calibration requirement The method to interpolate ROLO reflectance to sensor’s SRF could impact the absolute accuracy The lunar processing algorithm of MODIS is briefly introduced and its difference with GIRO is presented

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