Radiometric calibration of earth-observing sensors using an automated test site at Railroad Valley, Nevada

被引:47
作者
Czapla-Myers, Jeffrey S. [1 ]
Thome, Kurtis J. [2 ]
Leisso, Nathan P. [1 ]
机构
[1] Univ Arizona, Coll Opt Sci, Remote Sensing Grp, Tucson, AZ 85721 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
关键词
D O I
10.5589/m10-076
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
The Remote Sensing Group (RSG) at the University of Arizona uses the reflectance-based approach to radiometrically calibrate airborne and spaceborne sensors in the solar-reflective regime. The Radiometric Calibration Test Site (RadCaTS) concept was developed in 2004 to increase the amount of ground-based data collected. RadCaTS provides a methodology to determine the surface reflectance for any arbitrary test site in the absence of ground personnel. It is founded on the reflectance-based approach and has successfully operated at Railroad Valley, Nevada, with a suite of instruments including nadir-viewing multispectral radiometers, a Cimel sun photometer, and a meteorological station. RadCaTS data are currently used by RSG to supplement those collected by on-site personnel. This work presents a description of the RadCaTS automated concept, including the process used to determine surface reflectance and top-of-atmosphere (TOA) spectral radiance. The instrumentation required to measure the surface and atmosphere is introduced, followed by discussions regarding their placement on the 1 km 2 site at Railroad Valley and their calibration. Lastly, the RadCaTS results are compared with those obtained from the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) and Terra Moderate Resolution Imaging Spectrometer (MODIS). The average percent difference in TOA spectral radiance is 4.1% between the six bands of ETM+ and RadCaTS and 3.6% between the seven land bands of Terra MODIS and RadCaTS.
引用
收藏
页码:474 / 487
页数:14
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