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Progress of in-flight Calibration of HJ-1A/HSI

Progress of in-flight Calibration of HJ-1A/HSI. Li Chuanrong Invited expert of NRSCC Professor and Vice President Academy of Opto-Electronics,CAS Phuket, Nov 03, 2009. Contents. Brief introduction of HJ satellite and HSI senor CAL/VAL activities of HJ-1A/HSI Challenges Prospect.

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Progress of in-flight Calibration of HJ-1A/HSI

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  1. Progress of in-flight Calibration of HJ-1A/HSI Li Chuanrong Invited expert of NRSCC Professor and Vice President Academy of Opto-Electronics,CAS Phuket, Nov 03, 2009 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009

  2. Contents • Brief introduction of HJ satellite and HSI senor • CAL/VAL activities of HJ-1A/HSI • Challenges • Prospect 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009

  3. Introduction first-stage second-stage “2+1” “4+4” 4 optical satellites 2optical moonlets 1radar-moonlet 4radar satellites • On 2008.09.06,the small satellite constellationHJ -1A/1B were launched by a single LM-2C (CZ-2C) launch vehicle. • On 2009.03.30, HJ -1A/1B were ready for operational applications. • HJ -1C will launch soon. 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 3

  4. Introduction 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 4

  5. Introduction HJ-1A The small satellite for environment and disaster ( HJ-1A) in China carried a hyper-Spectral Imaging (HSI) sensor, designed by Academy of Sciences, CAS Spectral range: 450nm-950nm Band number: 115 Spatial resolution: 100m Swath: 50km Side-looking: ±30° Revisiting: 4-31days

  6. Principles of HSI Introduction • The imaging approach used by HSI is a spatially modulated Fourier transform method based on a Sagnac interferometer. • Onboard inner calibration mode and earth observation mode can be switched by a swing mirror. 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 6

  7. Introduction Principles of HSI 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 7

  8. Imaging Parameters of HSI Introduction Comparison of Parameters Between HJ-1A and EO-1 8 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009

  9. Calibration requirement to HSI: New imaging system and mechanism—We have less experiences We have not carried out on board calibration with consideration of instrument safety With the issues above we do need more sites and more experiments to study the way to calibrate this new kind of sensor CAL/VAL activities of HJ-1A/HSI 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 9

  10. Vicarious calibration activities Dunhuang Site (twice after launch) 40.08N, 94. 38E Altitude: 1200m 2008.10.14-2008.10.22 (Gain level 1) 2009.08.19-2009.08.29 (Gain level 2) Inner Mongolia (once for validation) 2009.09 CAL/VAL activities of HJ-1A/HSI 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 10

  11. Vicarious calibration at Dunhuang Site L Gain=dL/dDN offset DN Sensor’s spectral response function Illumination + Viewing angles Measure Target Surface Properties Measure Atmospheric Properties Sensor Signal (DN) Radiative Transfer Model - Modtran; 6S Predicted At-Sensor Radiance (L) 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 11

  12. Radiometric vicarious calibration results of HSI（Gain1) 12

  13. Cross comparison at Dunhuang site Between HJ-1A/HSI channels and corresponding MODIS bands 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 13

  14. HJ-1A/HSI and Terra/MODIS Image Pairs CAL/VAL activities of HJ-1A/HSI Cross-comparison at Dunhuang site HSI channel 73 UTM 04:41, May 29,2009 MODIS channel 1 UTM 04:25 May 29,2009 180 pixels 870 pixels 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 14

  15. CAL/VAL activities of HJ-1A/HSI Cross-comparison at Dunhuang site 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 15

  16. Discrepancy 1 2 3 distinction of observing geometry and atmosphere due to different acquisition time HSIcalibration accuracy MODIScalibration accuracy CAL/VAL activities of HJ-1A/HSI Cross-comparison at Dunhuang site 16

  17. Current challenges Uncertainties in radiometric vicarious calibration Radiometric cross-calibration method based on other well-calibrated satellite data is to be studied Spectral calibration is to be expected 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 17

  18. Prospect • Invited by former WGCV group chair Dr. Cao Changyong, we will take part in Antarctic Dome C project on behalf of NRSCC • The actions including confirmation of coverage area of Antarctic region and planning of data acquisition in Dec. of this year has been carried out • By working on this project, AOE, as technical and operational facilitator of NRSCC, is willing to join the actions of CEOS WGCV. • AOE will also be pleasant to technically bridge the action cooperation between CEOS and China related agencies, such as data democracy, calibration, validation, virtual constellation etc. 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 18

  19. Anticipated agency participation 2009-09-13 23:59 scene Center Latitude: S74.676132° scene Center Longitude:E124.513398° solar altitude angle: 5.5° HJ-1A/HSI image over Dome C area for example 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 19

  20. Anticipated agency participation Near-term plans • Provide related HJ-1A/HSIdata and technical parameters support, so as to enrich datasets about the Dome C site. • In accordance with the procedure of CEOS/WGCV, carry out the cross-calibration studies between HJ-1A/HSI and other well-calibrated visible/near infrared sensors based on the Antarctic Dome C calibration site. • Invite foreign calibration experts including those work for CEOS to go to China for scientific discussion periodically. 23rd CEOS Plenary I Phuket, Thailand I 3-5 December 2009 20

  21. Thank you !

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