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Isro Cal-Val Activities

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Isro Cal-Val Activities ISRO CAL-VAL ACTIVITIES Dr.Ashok K.Shukla Head, Calibration & Validation Division Deputy Project Director, OCM2 CAL-VAL Team Leader, Saral/AltiKa CAL-VAL Space Applications Centre Indian Space Research Organisation Ahmedabad, India Outline • ISRO Cal-Val activities • OCM2 Ocean color Cal-Val • Kavaratti Cal-Val site in ocean • Vicarious calibration of OCM2 using Kavaratti • Briefs on other Cal-Val activities CAL/VAL activities for Land, Ocean & Atmosphere CAL-VAL OPTICAL MICROWAVE OCEANSAT RESOUR- INSAT-3D CARTOSAT OCM CESAT MEGHA- RISAT-1 OCEANSAT SARAL SAR SCATTERO- TROPIQUES METER ISRO missions Satellite Sensor(s) Satellite Sensor(s) IRS-1D LISS-III, PAN, WiFS RESOURCESAT-2 AWiFS, LISS-III, OCEANSAT-1 OCM LISS-IV TES TES PAN Youthsat LiVHySI KALPANA-1 DRT-S&R, VHRR RISAT-1 SAR INSAT-3A CCD camera, DRT- MEGHA- MADRAS, SAPHIR, S&R, VHRR TROPIQUES ScaRaB, ROSA CARTOSAT-1 PAN INSAT-3D Imager, Sounder CARTOSAT-2 PAN SARAL AltiKa, ARGOS IMS-1 HySI (IMS-1), MxT CARTOSAT-3 Panchromatic, VNIR, RISAT-2 SAR-X SWIR, LWIR OCEANSAT-2 OCM, ROSA, TES-HYS HySI Scatterometer OCEANSAT-3 OCM3 RESOURCESAT-3 AWIFS, LISS-III, Air-borne Sensor(s) LISS-IV DMSAR C-SAR RISAT-L SAR L AHySI Hyper-spectral Sr. Parameters Satellites Status Sr. Parameters Status 1 Integrated water vapor MT operational 34 Surface reflectance Research 2 Humidity profile MT operational 35 VI Research 3 Temperature profile MT operational 36 LAI Research 4 Wind speed MT operational 37 FAPAR Research 5 Precipitation MT operational 38 Insolation Research 6 SWR & LWR MT operational 39 Albedo Research 7 Cloud liquid water MT operational 40 LST Research 8 Wind speed SARAL/AltiKa operational 41 Net radiation Research 9 Significant wave height SARAL/AltiKa operational 42 Evapotranspiration Research 10 Sea surface height SARAL/AltiKa operational 43 Biomass Research 11 Chlorophyll-a, OCEANSAT-II operational 44 NPP Research 12 Total suspended matter OCEANSAT-II operational 45 Snow/Ice products Research 13 Kd (490nm) OCEANSAT-II operational 46 Climate change index Research 14 AOT(865nm) OCEANSAT-II operational 15 Wind speed OCEANSAT-II operational 16 Wind direction OCEANSAT-II operational 17 AMV (CMV,WVW) INSAT-3D operational 18 OLR INSAT-3D operational 19 UTH INSAT-3D operational 20 SST INSAT-3D operational 21 Aerosol, INSAT-3D operational Geo-physical 22 T, q – profile INSAT-3D operational 23 Stab. Indices INSAT-3D operational parameters/products 24 Fire, Smoke INSAT-3D operational 25 Fog INSAT-3D operational 26 Rain INSAT-3D operational 27 Snow cover INSAT-3D operational 28 NDVI INSAT-3D operational 29 Ozone INSAT-3D operational 30 Wind Speed RISAT operational 31 Oil slick map RISAT operational 32 vegetation extent map RISAT Research 33 Soil moisture RISAT Research OCM2 OCEAN COLOR CAL-VAL NPL, New Delhi PIs network for OCM-II Geo- SAC, Ahmedabad physical product validation IMMT,Bhubneshwar CIFE, Mumbai IITM, Pune NIO, Goa Andhra University; NIO- University NRSC, H’bad RC, Vizag NPOL, Cochin DST. Annamalai Kavaratti University INS Sagardhwani – Field experiments 25 N I N D I A 20 V i s a k h a p a t n a m Area 3 Area 2 Karwar 15 Area 1 10 K o c h i 5 N 65 E 70 75 80 85 90 95 E NPOL, Kochi Gujarat Department of Marine Satpati Sciences, Goa University Arnala Versova Revdanda Murud Shreevardhan Harnnai CIFE, Mumbai ARABIAN SEA N Vengurla National Institute of Oceanography, Visakhapatnam Vizag Offshore time-series Coastal time-series IMMT,Bhubaneswar ORISSA &WB COAST Centre for Advanced Study in Marine Biology, Annamalai University Site 1 (20, 30, 50, 100, 200m) Site 2 (20, 30, 50, 100, 200m) Site 3 (20, 30, 50, 100, 200m) Site 4 (20, 30, 50, 100, 200m) Site 5 (20, 30, 50, 100, 200m) Sagar Kanya transect during Dec.09 – Jan.10,2010 Lakshadweep The Autonomous Vertical Profiler with Chl sensor Chlorophyll (microgram / l) 0 0.5 1 1.5 2 2.5 3 0 Locations off Goa 5 10 15 Depth(m) 20 25 30 11:55 35 KAVARATTI CAL-VAL SITE FOR OCEAN COLOR Conceptualization of Kavaratti CAL–VAL site development ATMOS SENSOR AT KAVARATTI INSAT SOLAR PANELS/ CHL. DATA BATT. OPTICAL SENSOR DISPLAY SENSOR SAC PAIR OF OPTICAL DATA TRANS MET RECEIVING & MET BUOYS LOGGER MITTER SENSOR STATION GPS/MONI ARCHIVAL/ MOORING SENSOR RETRIEVAL SYSTEMS & ANALYSIS Kavaratti CAL-VAL site in deep ocean in Lakshadweep SITE SENSORS / CHARACTERI- BUOY DESIGN / PARAMETERS ZATION/FLUORO. MET.CALIBATION (SAC) CALIBRATION (NIOT) (NIO) DATA TRAN- LABORATORY SMISSION / ON ISLAND CAL-VAL RECEPTION (DST) SITE (SAC) DATA OPTICAL PRODUCTS CALIBRATION DATA DATA (SAC) (NPL) UTILIZATION ARCHIVAL (USERS) (MOSDAC) Location of Kavaratti Site N • Sea depth : 1900 mtrs. • Case-1 water • Low chlorophyll Kavaratti island Design of experiment for CAL-VAL Site characterization at Kavaratti using Saga-Sukti vessel DAY-1 : 25 Kms.x 25 Kms. DAY-2 : 10 Kms.x 10Kms. DAY-3 : 5 Kms.x 5 Kms. DAY-4 : 5 Kms.x 5 Kms. DAY-5 : 5 Kms.x 5Kms. DAY-6 : 5 Kms.x 5Kms. 125 PIXELS AGATTI 80 PIXELS - o o 72 22’E/10 42’N Station for data collection KAVARATTI OPTICAL & MET buoy deployment on Kavaratti site Kavaratti Optical buoy 20 January 2010 Seen by OCM2 New OPTICAL and MET buoys OPTICAL buoy Hyper- spectral radiometer OPTICAL Buoy drift on Kavaratti site INSAT 3C CAL-VAL site, Kavaratti Delhi Earth Station, New Delhi SAC/MOSDAC/INCOIS INSAT MSS TYPE-C System INSAT • One-way transmission S-BAND C-BAND HUB STATION INTERNET USERS (MSS TYPE-C TERMINALS) Data Transmission MSS Transmitter S – Band BPSK Synthesiz Modulator SSP er A • GPS acquisition • Data collection • Every hourly data Optical Respectiv Communicat transmission Radiomet e i-on GPS er\ Data Controller Receiver • Re-transmission to Sun Logger avoid data loss Photomet er •Transmission time : 0800-1700 hrs. Multiple 12V DC DC – DC DC Supply Supply Converter • Sleep /wakeup mode 9V – 36V To all feature Sub sys. Systems • Volume : 70kbytes/day Block Diagram of CAL – VAL Site Transmitter Data reception C-band 7.5m CAL/VAL Chain LNA&RF BPSK Interface FTP Down Demodulator Unit Server Converter (SHU) BPSK (1+1) FTP Demodulator Interface Server Unit Internet (SHU) • Error free packets from two transmissions • Data access through FTP server MOBY Vs OPTICAL BUOY Ship version of OPTICAL BUOY Spatial measurement CAL-VAL setup on Kavaratti island Instrument calibration CAL-VAL Sample analysis CIMEL Sun/sky Photometer on Kavaratti island 1020nm 870nm 670nm 440nm 500nm 380nm 0.2 AOD vs Time (30/11/2007) 0.18 0.16 0.14 0.12 0.1 AOD 0.08 0.06 0.04 0.02 0 2:13:38 2:31:11 2:38:02 2:49:52 2:58:25 Time (GMT) Parameters being measured at Kavaratti Sr. No. Instrument Parameters 1 Hyper spectral Spectral surface irradiance radiometer Spectral irradiance at 1.8m & 6.5m depth Spectral radiance at 2.26m & 7.2m depth Spectral attenuation coefficient for irradiance Spectral water leaving radiance Spectral normalized water leaving radiance Spectral remote sensing reflectance 2 Fluorometer Chlorophyll-a concentration Normalized turbidity unit 3 Met buoy sensors Air pressure Air temperature,Wind speed,Wind direction Relative humidity,Water temperature 4 Sun photometer Aerosol optical depth Integrated water vapor 5 Micro rain radar Rain rate 6 Disdrometer Rain intensity,Rain amount Total rain amount 7 Dr.Pisharoty Air pressure,Air temperature,Relative humidity sonde Wind speed,Wind direction Accuracy of in-situ parameters Sr.No. Instrument Parameter Measureme- nt error 1 In-air Hyper-spectral Down-welling irradiance +/- 2% radiometer (350-850nm) 2 In -water Hyper-spectral Up-welling radiance +/- 2% radiometer (350-850nm) Down-welling irradiance +/- 2% 3 Fluorometer Chlorophyll -a concentration 0 .02 g/ltr.* 4 Turbidity sensor Turbidity 0.1 NTU 5 Sun photometer Direct-sun irradiance +/- 2% Sky radiance +/- 2% 6 Anemometer Wind speed +/ - 2% Wind direction +/- 1% 7 Air temperature sensor Air temperature +/ - 0.1 oC 8 Hygrometer % Relative Humidity +/- 1% 9 Barometer Air pressure +/- 0.05% 10 Thermometer Sea surface temperature +/-0.005 oC Integrating sphere for Radiance calibration Calibration setup for irradiance calibration Absolute rad./wavelength calibration of radiometers Radiance calibration Wavelength calibration HR05144-Lu 35th - CEOS Working Group on Calibration and Validation 24-28, September, 2012, Hyderabad, India Temporal stability of radiometric sensor Power mode HR050145 Ed Sensor Power mode HR050145 Ed Sensor Power mode Current mode Peak RMS Median RMS Median Error Error Error Error UV (390-405nm) 0.3 0.3 0.2 0.2 Blue (440-470nm) 0.2 0.2 0.1 0.1 Green(500-610nm) 0.3 0.3 0.1 0.1 White(440-610nm) 0.3 0.3 0.1 0.1 Red(700-730nm) 0.6 0.6 0.1 -1.0 IR(800-830nm) 0.4 0.5 0.1 -0.1 Entire spectrum(390-830nm) 0.4 0.3 0.2 0.1 CAL-VAL Package for data archival/ retrieval Data dissemination and web portal DATA ANALYSIS FOR VICARIOUS CALIBRATION OF OCM2 Solar irradiance at sea surface (Good day at Kavaratti) (OCM bands) 1.4 412n 1.2 m 1 443n m 0.8 490n 0.6 m 510n 0.4 m 0.2 555n m Es ( uW/cm2/nm)Es 0 Time ( hrs.) OPTICAL buoy tilt during deployment nLw from OPTICAL buoy during deployment Rrs from OPTICAL buoy during deployment Vicarious calibration of OCM2 sensor Water-leaving radiance (in situ) Total ozone + Rayleigh radiance L Atmospheric P r Lr ()F' ()P (, ,)/ 4 r r0 r 0 r 0 pressure P0 + Whitecap correction Lwc Whitecap radiance & F0 cos0 diffuse transmission L 0.22* f *t( ,)* wc 0 t exp- / 2 / cos + r oz Aerosol radiance, L (single as AOD, SSA scattering approximation) (CIMEL inversion) Las F0a () a ()Pa (,0 ,)/ 4 cos + Top-of-the-atmosphere Top-of-the-atmosphere (in situ) (satellite) L (λ) + L (λ) + t(λ)L (λ) + t(λ)L (λ) r as w wc Vicarious gain 35th - CEOS Working Group on Calibration and Validation 24-28, September, 2012, Hyderabad, India Satellite radiance extraction 5x5 pixel (sub-set OCM2 band Geometric extraction) over Imagery data correction Matchup criteria observation point Yes Satellite radiance Matchup criteria for Vicarious calibration extraction In situ geo- location Select pixels with NGP within ±1.5*σ*mean Find the Yes Sensor zenith closest pixel < 60o and Solar zenith < 75o Is NGP > TNP/2+1 Yes Exclude flagged Yes Total no.
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