OCEANSAT-2 OCEAN COLOUR MONITOR (OCM-2)
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1 OCEANSAT-2 OCEAN COLOUR MONITOR (OCM-2) Update of post launch vicarious, lunar calibrations & current status Presented by Prakash Chauhan Space Applications Centre Indian Space Research Organistaion Ahmedabad- India
2 OCEANSAT-2 OCEAN COLOUR MONITOR (OCM-2)
3 PRE-LAUNCH PERFORMANCE (Radiometric/Spatial)
4 MODES OF OPERATIONS Local Area Coverage (LAC) with 360m, real time transmission Global area coverage (GAC) with 1 km, on-board Recording & playback GAC data coverage between +/ Latitude covering full globe in 8 days
5 OCEANSAT-2 OCM Data products LEVEL-1 Product: Basic Data Products - L1A RAW Products (Internal Use Only & DQE) - L1B Radiance Product - L1C Radiometrically and Geometrically corrected LEVEL-2 Product: Geo-Physical Parameters - Chlorophyll-a concentration - Total Suspended Matter (TSM) - Diffused Attenuation Coefficients (K d nm) - Aerosol Optical Depth (AOD) at 865 nm Products supported in HDF 4 format can be Displayed and processed in SeaDas
6 Absolute Radiometric Cal & Lunar Calibration of OCM -2 Three Moon acquisitions for OCM-2 were done , and 1 Aug 2012 ROLO Model OCM measured 26 July Nov 2011
7 Vicarious Calibration of OCM -2 Vicarious calibration is considered as a tool for verifying the pre-launch calibration data evaluating possible sensor decay with ageing Cal/Val site at Kavaratii in Arabian sea In water sea reflectance data is being collected in low chlorophyll waters (<0.125 mg/m 3 ); Under clear atmospheric conditions (AOD 870nm < 0.2); using hyper spectral instruments; and well calibrated field instruments
8 Long Term ocean reflectance observations using Kavaratii buoy
9 Ocean & Atmospheric Parameter variability at KVT Time series observations of in-water parameters, Year 2012 Time series observation of AOD at 870nm, Year 2012
10 Vicarious Calibration Results ( ) Band No. Total points % error CC (R 2 ) Mean TOA radiance (µw/cm 2 /sr/nm) KVT OCM Gain coefficients (2013) B B B B B B B B8-0.80
11 Relative radiometric calibration of OCM2 data Band -3 Algorithm details
12 Retrieved Chl-a from OCM-2 and MODIS, 25 th September-2011 (After moon calibration of OCM-2) Oceansat-2, OCM MODIS India India mg/m^3
13 MODIS & OCM comparison II I III OCM-2 MODIS
14 Global Monthly products from OCM-2
15 Rayleigh Calibration Observe the atmosphere over ocean (dark) Rayleigh scattering : > 80% of signal TOA reflectance well predicted using RT models Data Source s ocean surface reflectance : predicted using climatology derived from SeaWiFS only over very stable oceanic zones (oligotrophic zones) aerosols : estimated using MODIS 865 nm band Only optical thickness < 0.1 are kept gain No. of Pixels
16 Rayleigh Calibration (Results) R rs (488) MODIS R rs (490) OCM R rs (555) MODIS R rs (555) OCM
17 15-16 March Chlorophyll-a
18 3-4 March 2012 Rayleigh Calibration (Results) Chlorophyll-a Y=Chl-a OCM X=Chl-a MODIS Y=0.61X-0.25 R=0.82 RMSE= International Ocean Colour Science Meeting, San Francisco, June 15-18,
19 OCM Rrs490 (January, 2014) N= S= I=0.003 RMSE=0.001 R=0.7 I N= S=0.62 I=0.004 RMSE= R=0.61 II MODIS Rrs490 (January, 2014) N= S=0.66 I= RMSE=0.001 R=0.54 III I II III
20 Reprocessed Global Chlorophyll-a distribution (January, 2012) Chlorophyll-a mg/m 3
21 Summary Post launch Lunar and Vicarious calibration techniques have been used to asses the radiometric cal of OCM-2 data Lunar calibration using ROLO model has improved the geophysical retrieval. Vicarious Calibration has helped in tracing the radiometric stability Relative radiometric calibration techniques have reduced striping Rayleigh calibration has helped further in overall improvement of global geophysical products KVT Cal/Val buoy data available from Thank You Validation at KVT site OCM-2 Chl In-situ Chl
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