Current Application of Vicarious Calibration for Geostationary Ocean Color Imager (GOCI) DATA
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1 Current Application of Vicarious Calibration for Geostationary Ocean Color Imager (GOCI) DATA On behalf of Jae-Hyun Ahn & Young-je Park, Seongick CHO(Secondment at Astrium SAS, France) Korea Ocean Satellite Center Korea Institute of Oceanography and Technology
2 Calibration Region for 745nm Centered Band Region of vicarious calibration by Wang et al. (2013) Region of vicarious calibration by KOSC (2013) Basic assumption for NIR correction 865nm band is perfectly calibrated, gain(865nm)=1.0 NIR Vicarious calibration site Maritime relative humidity 99% (M99) aerosol
3 Calibration Result of 745nm Centered Band Sampling constraints (KOSC, 2013) Wind speed < 4 m/s ρ TOA (865nm)-ρ r (865nm) < Slot border distance to Eastward < 400 pxls Slot border distance to Southward < 400 pxls Bright pixel distance for all directions> 100 pxls Bright pixel : ρ TOA (865nm)-ρ r (865nm) > 0.1 Negative radiance pixel > 500 pixels Negative radiance pixel : ρ TOA (865nm)-ρ r (865nm) < 0.0
4 Vicarious Calibration of Visible Bands Approach Vicarious calibration without sharing aerosol models with some other sensors Franz et al. (2007) Flowchart Satellite data AC result In situ TOA radiance VC gain (initial value = 1.0) Atmospheric correction Atmospheric radiance Atmospheric transmittance Ocean radiance Build TOA radiance True ocean radiances from in situ data Calibrated data New Gain= (New TOA radiance) / (TOA radiance) New TOA radiance
5 In-situ Data for Visible Bands Calibration In-situ clear water spectra list, nl w (660 nm) < 2.5 w/m 2 /um/sr Year Month Day Hour Min Latitude Longitude nl w (412nm) nl w (443nm) nl w (490nm) nl w (555nm) nl w (660nm) nl w (680nm) nl w (745nm) nl w (865nm) * nl w : normalized water leaving radiance (w/m 2 /um/sr)
6 gain Derived gain Wavelength (nm) Wavelength (nm) KOSC standard Wang (OO 2012) Wang (OE 2013) KOSC standard : newly derived in 2013 by Ahn Wang (OO 2012) : Ocean optics 2012 by Wang Wang (OE 2013) : Optics express 2013 by Wang
7 Improvement of accuracy by the application vicarious calibration 412 nm 443 nm 490 nm 555 nm 660 nm 680 nm
8 GOCI derived nlw(443nm)/nlw(555nm) GOCI derived nlw(490nm)/nlw(555nm) Improvement of accuracy by the application vicarious calibration in-situ nlw(443nm)/nlw(555nm) in-situ nlw(490nm)/nlw(555nm)
9 Improvement of accuracy by the application vicarious calibration Validation with new data Pungdo, 2011 / 06 / 11
10 Improvement of accuracy by the application vicarious calibration wavelength (nm) * k : station number
11 Conclusion & Discussion & To Do 1. Conclusion Vicarious calibration process improved accuracy (59% 19% error) 2. Discussion In-situ dataset Insufficient data Above water measurement Data reliability Inter-sensor calibration M99 aerosol model assumption for 745nm centered band calibration Turbid water NIR correction model of atmospheric correction can be effected
12 Thank you!! For Further Questions,
13 Regional Issues for a Vicarious Calibration Application On behalf of Young-je Park & Jae-Hyun Ahn, Seongick CHO Korea Ocean Satellite Center Korea Institute of Oceanography and Technology
14 Site Selection for 745nm Centered Band Calibration GOCI coverage Region of vicarious calibration by KOSC (2013) ~ N ~ E NIR Vicarious calibration site Maritime relative humidity 99% (M99) aerosol Avoid continental aerosol
15 Issues for NIR band (745nm) calibration region Still can be influenced by continental aerosol Accessibility Issues for VIS band (412~745nm) calibration region Data quality issue Spatial / temporal variability In-situ radiometric measurements for vicarious calibration Above water measurement Inter-sensor calibration issue Difference between MERIS / MODIS / GOCI / in-situ water reflectance spectra Discrepancies between MERIS / MODIS / GOCI / in-situ water reflectance spectra Data quality issue Steady and lasting in-situ radiometric monitoring site is needed (such as MOBY site) Plan to deploy a buoy in the East Sea
16 Thank you Further questions
17 Data sharing policy of KOSC Young-je Park Korea Ocean Satellite Center Korea Institute of Oceanography and Technology
18 KOSC in-situ data sharing /distribution policy Open policy for international Cal/Val cooperation Agreement required for other works Also other institutions shared in-situ dataset will be helpful for GOCI Cal/Val
19 Thank you Further questions
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