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Remote Sens. 2014, 6(2), 1327-1346; doi:10.3390/rs6021327

Absolute Calibration of Optical Satellite Sensors Using Libya 4 Pseudo Invariant Calibration Site

Department of Electrical Engineering & Computer Science, South Dakota State University (SDSU), Brookings, SD 57007, USA
Image Processing Lab, Department of Electrical Engineering & Computer Science, South Dakota State University, Daktronics Engineering Hall, Room 315, P.O. BOX 2219, SDSU, Brookings, SD 57007, USA
Science Systems and Applications Inc., 10210 Greenbelt Road, Lanham, MD 20706, USA
Sigma Space Corporation, Lanham, MD 20706, USA
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD 20771, USA
Author to whom correspondence should be addressed.
Received: 15 December 2013 / Revised: 23 January 2014 / Accepted: 26 January 2014 / Published: 12 February 2014
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The objective of this paper is to report the improvements in an empirical absolute calibration model developed at South Dakota State University using Libya 4 (+28.55°, +23.39°) pseudo invariant calibration site (PICS). The approach was based on use of the Terra MODIS as the radiometer to develop an absolute calibration model for the spectral channels covered by this instrument from visible to shortwave infrared. Earth Observing One (EO-1) Hyperion, with a spectral resolution of 10 nm, was used to extend the model to cover visible and near-infrared regions. A simple Bidirectional Reflectance Distribution function (BRDF) model was generated using Terra Moderate Resolution Imaging Spectroradiometer (MODIS) observations over Libya 4 and the resulting model was validated with nadir data acquired from satellite sensors such as Aqua MODIS and Landsat 7 (L7) Enhanced Thematic Mapper (ETM+). The improvements in the absolute calibration model to account for the BRDF due to off-nadir measurements and annual variations in the atmosphere are summarized. BRDF models due to off-nadir viewing angles have been derived using the measurements from EO-1 Hyperion. In addition to L7 ETM+, measurements from other sensors such as Aqua MODIS, UK-2 Disaster Monitoring Constellation (DMC), ENVISAT Medium Resolution Imaging Spectrometer (MERIS) and Operational Land Imager (OLI) onboard Landsat 8 (L8), which was launched in February 2013, were employed to validate the model. These satellite sensors differ in terms of the width of their spectral bandpasses, overpass time, off-nadir-viewing capabilities, spatial resolution and temporal revisit time, etc. The results demonstrate that the proposed empirical calibration model has accuracy of the order of 3% with an uncertainty of about 2% for the sensors used in the study. View Full-Text
Keywords: radiometric calibration; absolute calibration; PICS; BRDF; Landsat; MODIS radiometric calibration; absolute calibration; PICS; BRDF; Landsat; MODIS

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Mishra, N.; Helder, D.; Angal, A.; Choi, J.; Xiong, X. Absolute Calibration of Optical Satellite Sensors Using Libya 4 Pseudo Invariant Calibration Site. Remote Sens. 2014, 6, 1327-1346.

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