Characterization of MODIS VIS/NIR Spectral Band Detector-to-Detector Differences

被引：0

作者：

Xiong, X. ^{[1
]}

Sun, J. ^{[2
]}

Meister, G. ^{[3
]}

Kwiatkowska, E. ^{[4
]}

Barnes, W. L. ^{[5
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Sci & Explorat Directorate, Greenbelt, MD 20771 USA

[2] Sci Syst & Applicat Inc, Lanham, MD 20706 USA

[3] Futuretech Corp, Greenbelt, MD 20770 USA

[4] NASA, Goddard Space Flight Ctr, Ocean Biol Proc Grp, SAIC, Greenbelt, MD 20771 USA

[5] Univ Maryland Baltimore Cty, JCET, Baltimore, MD 21250 USA

来源：

EARTH OBSERVING SYSTEMS XIII | 2008年 / 7081卷

关键词：

MODIS; solar diffuser; lunar observations; calibration; ocean color; VIS; NIR;

D O I：

10.1117/12.792700

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

MODIS has 36 spectral bands with wavelengths in the visible (VIS), near-infrared (NIR), short-wave infrared (SWIR), mid-wave infrared (MWIR), and long-wave infrared (LWIR). It makes observations at three nadir spatial resolutions: 0.25km for bands 1-2 (40 detectors per band), 0.5km for bands 3-7 (20 detectors per band), and I km for bands 8-36 (10 detectors per band). The VIS, NIR, and SWIR are the reflective solar bands (RSB), which are calibrated on-orbit by a solar diffuser (SD) and a solar diffuser stability monitor (SDSM). The bi-directional reflectance factor (BRF) of the SD provides a RSB calibration reference and its on-orbit changes are tracked by the SDSM. In addition.. MODIS lunar observations are regularly scheduled and used to track the RSB calibration stability. On-orbit observations show that the changes in detector response are wavelength and scan angle dependent. In this study, we focus on detector-to-detector calibration differences in the MODIS VIS/NIR spectral bands, which are determined using SD and lunar observations, while the calibration performance is evaluated using the Earth view (EV) level IB (LIB) data products. For Aqua MODIS, the detector calibration differences and their impact are also characterized using standard ocean color data products. The current calibration approach for MODIS RSB carries a band-averaged response versus scan angle (RVS) correction. The results from this study suggest that a detector-based RVS correction should, due to changes in the scan mirror's optical properties, be implemented in order to maintain and improve the current RSB L I B data product quality, particularly, for several VIS bands in Terra MODIS.

引用

页数：10