IR Calibration Monitoring System
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IR Calibration Monitoring System for COMS in Korea. Sung-Rae Chung, Hye-Sook Park*, B. J. Sohn*, Mi-Lim Ou Korea Meteorological Administration *Seoul National University. 1. Outline. Overview of Communication, Ocean and Meteorological Satellite (COMS) COMS Calibration System

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IR Calibration Monitoring System

for COMS in Korea

Sung-Rae Chung, Hye-Sook Park*, B. J. Sohn*, Mi-Lim Ou

Korea Meteorological Administration

*Seoul National University

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT

1


Outline

  • Overview of Communication, Ocean and Meteorological Satellite (COMS)

  • COMS Calibration System

  • IR Calibration Monitoring System for COMS

  • Future Works

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Overview of Communication, Ocean and Meteorological Satellite (COMS)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Geostationary Ocean Color Imager (GOCI) Satellite (COMS)

S-Band Antenna

Meteorological Imager (MI)

Ka Band Antenna

Flight Configuration of COMS

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Meteorological Imager (MI) Satellite (COMS)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


COMS L1B data Satellite (COMS)

Scene Analysis

: Special mode

AMV

COMS Meteorological Products

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Future COMS Operation Center Satellite (COMS)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


COMS Calibration System Satellite (COMS)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Daily data Satellite (COMS)

acquisition

COMS counts

Geometric data

MODIS radiances

Geometric data

On-board Blackbody data

Space look data

Scene check

Clear

Clear

Cloudy

Clear

VISCD

IRC

VISCO

VISCC

IR Calibration Equation

VIS Vicarious Calibration

IR Calibration Monitoring

Cloud Target

Desert Target

Ocean Target

Simulated radiances vs

COMS counts

COMS counts vs MODIS

brightness temp.

Twice

a month

IR Calibration coefficient

VIS Calibration coefficient

Monitoring parameters

(Mean Bias,RMSE)

COMS Calibration Algorithm

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Simpson Desert (Australia) Satellite (COMS)

Calibration Targets

COMS VIS Calibration Targets

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Daily mean Satellite (COMS)

 MODIS Reflectance

Simulated reflectance

Reflectance

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160

Julian day in 2004

Results of VIS Calibration

5-day average

Ocean Target

Desert Target

CloudTarget

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


IR Calibration Monitoring System for COMS Satellite (COMS)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


IR Calibration Monitoring Satellite (COMS)

Monitoring COMS MI brightness temperatures through the intercomparison with temperatures from well-calibrated sensors.

Here, COMS algorithm is applied to MTSAT-1R with MODIS as a reference.

That is,

TB’(GEO) = a + b *TB(MODIS)

TB(GEO) vs. TB’(GEO)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Match up conditions

Geostationary Satellite (COMS)

Satellite

(MTSAT-1R)

Polar orbital

Satellite

(MODIS/Terra)

Match-up Conditions

  • Observation time difference

    - Maximum time difference is within 5 min

  • Target

  • - Selection clear or homogenous target

  • Spatial resolution difference

    - MODIS: 1km, MTSAT-1R: 4km

    - Average over pixels of 0.2° resolution

  • Viewing angle (VA) difference

    - The viewing angle difference changes

    the effect of atmosphere

    - Data are selected within 50° of satellite viewing angle

    from nadir (M. König, 1999)

    - Maximum viewing angle difference is within 5°

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Window CH1 Satellite (COMS)

Window CH2

SWIR CH

WV CH

Spectral Channel Characteristics

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


R : radiance at the top of the Satellite (COMS)

atmosphere

Φ : spectral response function

ν : wavenumber

Development of Transfer function

  • For the simulation of brightness temperature, RTTOV-7 model

    used with Thermodynamic Initial Guess Retrieval (TIGR) 2000 profile

    data as inputs.

  • Instrument random noise are added by assuming a normal

    distribution of the noise with zero mean and 1 standard deviation

    equal to the NEdT

  • Simulations and regressions are made at every 5 viewing angle

    and over land and ocean, separately.

  • Convert MODIS brightness temperature into MODIS equivalent MTSAT-1R

    brightness temperature

TB’MTSAT = a + b *TBMODIS : Transfer function

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Results Satellite (COMS)

  • Period : August 2005 ~ August 2006 (13 months)

  • Region : 40°S – 40°N, 100°E– 180°E

  • IR calibration monitoring every week

    - For the SWIR channel, only nighttime data are used

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Inter-Calibration of MTSAT-1R Satellite (COMS)

13 months

(Aug. 2005 – Aug. 2006)

Window

CH2

Window

CH1

Before: 2005.8.1 - 2006.2.18

Correct 1: 2006.2.19- 6.30

After: 2006. 7.1 - 8.31

SWIR CH

WV CH

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Weekly Calibration Monitoring Satellite (COMS)

From Puschell et al. (2006)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Future Works Satellite (COMS)

  • Test COMS calibration system

  • Standardize and improve the system

  • Formulate the IOT plan for calibration

  • Intercompare to the hyperspectral sensor for COMS IR calibration monitoring

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


Thank you! Satellite (COMS)

GLOBAL SPACE-BASED INTER-CALIBRATION SYSTEM (GSICS)

Joint Meeting of GDWG-I and GRWG-II, 12-14 June 2007, EUMETSAT


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