Ground-monitor radiometer system for vicarious calibration

Kurtis Thome; Jeffrey Czapla-Myers; Stuart F. Biggar

doi:10.1117/12.559950

15 October 2004 Ground-monitor radiometer system for vicarious calibration

Kurtis Thome, Jeffrey Czapla-Myers, Stuart F. Biggar

Proceedings Volume 5546, Imaging Spectrometry X; (2004) https://doi.org/10.1117/12.559950
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

The Remote Sensing Group at the University of Arizona has been active in the vicarious calibration of numerous sensors through the use of ground-based test sites. Application of these approaches has been limited in the past by the fact that ground-based personnel must be present at the time of the sensor overpass. This work presents the design and implementation of a set of ground-based, ground-viewing radiometers that are deployed without the need for on-site personnel. The radiometers are based on LED detectors allowing them to be robust and inexpensive and combining the results of these measurements with known calibration of the sensors and a suitable surface BRDF model, allows the surface spectral reflectance of the test site to be determined for the sensor overpass. The at-sensor radiance can be predicted via a radiative transfer code using atmospheric data from a fully-automated solar radiometer. Early results from this approach are presented for the Landsat ETM+ and Terra and Aqua MODIS sensors. These results show that errors are currently larger for this method than those with ground-based personnel, but the increased number of calibration opportunities should improve the overall understanding of the sensor calibration.

Citation Download Citation

Kurtis Thome, Jeffrey Czapla-Myers, and Stuart F. Biggar "Ground-monitor radiometer system for vicarious calibration", Proc. SPIE 5546, Imaging Spectrometry X, (15 October 2004); https://doi.org/10.1117/12.559950

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