An overview of inter-comparison methodologies for Terra and Aqua MODIS calibration

Xiong, X.; Wu, Aisheng; Sun, Junqiang; Wenny, Brian N.

doi:10.1117/12.679162

Cited by 8 publications

(5 citation statements)

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“…The comparison has shown that the differences in AOT between them have not changed essentially with respect to what they are for the uncommon time periods. This proves that the encountered differences between MODIS Terra and Aqua AOT over the study region should be rather attributed to sensor cross‐calibration issues [see, e.g., Xiong et al , 2006] and/or dust patchiness (see section 3.3).…”

Section: Analysis and Resultsmentioning

confidence: 69%

Natural versus anthropogenic aerosols in the eastern Mediterranean basin derived from multiyear TOMS and MODIS satellite data

et al. 2009

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[1] In the present study we investigate the spatial and temporal variation of aerosol optical thickness (AOT) in the eastern Mediterranean basin, and more specifically in the area extending from 28.5°N to 42.5°N and from 18.5°E to 35.5°E, which includes large urban areas and megacities such as Cairo, Istanbul, Athens, Izmir, Ankara, and Thessaloniki. For this purpose we use long-term AOT data from the Total Ozone Mapping Spectrometer (TOMS) version2 converted to 500 nm (AOT 500 ) for the period 1980-2001 and Collection 005 AOT data at l = 550 nm (AOT 550 ) from Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra and Aqua satellites for the periods 2000-2005 and 2002-2005, respectively. The spatial and temporal variation of AOT shows a good agreement between TOMS and MODIS, in terms of geographical patterns, which maximizes the usefulness of TOMS AOT product given its long temporal coverage (climatological). According to MODIS-Terra, the annual mean AOT 550 over the studied region equals 0.22 ± 0.05 (monthly values ranging from 0.14 to 0.32) and shows strong spatial inhomogeneities. The smallest values (down to 0.1) occur over the western, and especially in the northwestern, part of Greece, over the northern part of Anatolian peninsula and also over the sea of east Mediterranean. The largest AOT values (up to about 1.0) occur over northern Africa, Middle East, and the adjacent coasts, and over the Anatolian plateau. These high aerosol loadings are of natural origin, mainly desert dust. However, very large values (up to 0.8) are also found over large urban areas surrounding megacities, associated with anthropogenic, apart from natural desert, aerosols. By using TOMS AOT data as proxy for the dust source, and the difference of MODIS-TOMS AOT as an indicator of the anthropogenic aerosol component, the relative contribution of natural versus anthropogenic sources of aerosols has been derived for the eastern Mediterranean area. Limitations of this approach are discussed and the associated uncertainties are also evaluated and discussed.

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Section: Analysis and Resultsmentioning

confidence: 69%

Natural versus anthropogenic aerosols in the eastern Mediterranean basin derived from multiyear TOMS and MODIS satellite data

et al. 2009

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“…Our early results from Dome C observations have shown that the calibration of Terra and Aqua MODIS bands 1 and 2 (0.65 and 0.86μm) has been consistent within 1-2%, and that the bands 31 and 32 (11 and 12μm) differences are less than a few tenths of Kelvin [21][22][23]. This paper provides a brief description of the methodologies applied in our calibration and validation study and reports our recent progress on cross-comparison of Terra and Aqua MODIS spectral bands using observations over the Dome C area.…”

Section: Introductionmentioning

confidence: 83%

“…Among these ground targets, the Dome C site in Antarctica has been selected by the MCST to study the MODIS calibration long-term stability and to examine the calibration consistency between the two *Xiaoxiong.Xiong-1@nasa.gov MODIS instruments. In our study of calibration stability and consistency, we have also included other sensors, such as AVHRR, AIRS, MISR, and Landsat TM and ETM+ [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Recent progress on cross-comparison of terra and aqua MODIS calibration using Dome C

Xiong

Angal

et al. 2009

SPIE Proceedings

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For the past few years, the MODIS Characterization Support Team (MCST) at NASA/GSFC has continued and extended its effort to monitor the Terra and Aqua MODIS calibration long-term stability and to examine their calibration consistency using observations made over the Dome Concordia, Antarctica. Early results from Dome C observations show that the calibration of bands 1 and 2 (0.65 and 0.86 micron) has been consistent within 1-2% and bands 31 and 32 (11 and 12 micron) differences are less than a few tenths of Kelvin, demonstrating that this site can provide a useful calibration reference for a wide range of Earth-observing sensors in the spectral region from visible (VIS) to long-wave infrared (LWIR). Recently, several locations at the Dome C area have been endorsed by the CEOS as radiometric reference sites for sensor cross-comparison. This, as a result, has led to an invitation to the broad earth-observing community to participate in a CEOS comparison of top-of-atmosphere (TOA) spectral radiance/reflectance over the Dome C sites. In this paper, we provide a brief description of the methodologies applied in our study and report recent progress on cross-comparison of Terra and Aqua MODIS spectral bands using observations over the Dome C area, including data provided in support of the upcoming CEOS sensor cross-comparison.

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“…The MODIS Characterization Support Team (MCST) at NASA GSFC is responsible for implementing MODIS calibration activities, maintaining the level 1B (L1B) algorithms, and analyzing calibration data from its OBC and lunar observations. Since launch, well-characterized ground targets (Earth view observations) have also been used by a number of MODIS calibration and validation scientists and by the MCST analysts independently to examine and validate sensor on-orbit calibration, characterization, and performance [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Using Dome C for moderate resolution imaging spectroradiometer calibration stability and consistency

Xiong

Wenny

2009

J. Appl. Remote Sens

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Abstract. Currently, there are two nearly identical moderate resolution imaging opoctrnmJiometer (MK}DlS) instruments operated in space: one on the Tuoo spacecraft |uuuc6cd in December 1999 and another oil the Aqua spacecraft launched in May 2002. MDDIS has 36 upcoto| bands with ~vovu|wogtbu covering from visible (\/l8) to long-wave infrared (LTYLD). Since |uuoob, M0DIS *bsmm'uiomo and data products have significantly enabled studies of changes in the Earth systern of land, oceans, and atmosphere. In order to muiuto10 its on-orbit calibration and data product quality, K4ODlS was built with u comprehensive set of ou'6nmd calibrators. k4OD|S reflective ao|m bands (RS8) are uu}i6rmcd no-orbit by v oyumoo that consists of m|u, diffuser (SD) and u solar diffuser stability mnodnr(6D9M) on o regular basis. Its thermal emissive 6oudo (IG8) calibration is oxouux:J no u auoo-hy-000n basis using an nu-bumod blackbody ( BB ) . The MODl8 Characterization Support Tcmu (hJCOT) mY4&8A/8&FC has been ounouoib|o for supporting sensor calibration and characterization tasks from pre-launch m post launch. In this paper, ,/c dmudhm current MC8T efforts and progress made to examine sensor stability and intercalibration consistency using observations over Dome Concordia, Antarctica. Results ohn* that this site call provide useful calibration reference for Earth-observing sensors.

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An overview of inter-comparison methodologies for Terra and Aqua MODIS calibration

Cited by 8 publications

References 0 publications

Natural versus anthropogenic aerosols in the eastern Mediterranean basin derived from multiyear TOMS and MODIS satellite data

Natural versus anthropogenic aerosols in the eastern Mediterranean basin derived from multiyear TOMS and MODIS satellite data

Recent progress on cross-comparison of terra and aqua MODIS calibration using Dome C

Using Dome C for moderate resolution imaging spectroradiometer calibration stability and consistency

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