Radiometric calibration of G-LiHT's imaging spectrometer using GLAMR for satellite sensor intercalibration

Amit Angal; Joel McCorkel; Bruce Cook; Lawrence A. Corp; Kurt Thome

doi:10.1117/12.2188763

8 September 2015 Radiometric calibration of G-LiHT's imaging spectrometer using GLAMR for satellite sensor intercalibration

Amit Angal, Joel McCorkel, Bruce Cook, Lawrence A. Corp, Kurt Thome

Author Affiliations +

Proceedings Volume 9607, Earth Observing Systems XX; 96070C (2015) https://doi.org/10.1117/12.2188763
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

NASA Goddard’s Lidar, Hyperspectral and Thermal Imager (G-LiHT) facilitates simultaneous measurements beneficial to variety of applications. Of the suite of “off-the shelf” instruments of G-LiHT, the Visible Near-Infrared (VNIR) Imaging Spectrometer acquires high resolution spectral measurements (1.5 nm resolution) from 0.4 to 1 μm. Goddard Space Flight Center’s Laser for Absolute Measurement of Response (GLAMR) was used to measure the absolute spectral response (ASR) of the G-LiHT’s imaging spectrometer. Continuously tunable lasers coupled to an integrating sphere allow a radiance-based calibration for the detectors at reflective solar wavelengths. GLAMR measurements, covering a wavelength range from 0.58 to 0.99 μm were acquired between July 30 to August 2, 2013. In order to account for the large field-of-view (50°), G-LiHT was rotated in 2 degree increments so that the same area of the sphere is viewed by all detectors. Using this data along with the coincident Silicon trap radiometer measurements, the ASR was computed. The derived calibration parameters for G-LiHT’s Imaging Spectrometer are to be transferred to near-simultaneous measurements of Landsat sensors. Calibration uncertainty of G-LiHT is 1-3% depending spectral region and transferring this traceability to coincident satellite sensors has 3-5% depending on spectral region.

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Amit Angal, Joel McCorkel, Bruce Cook, Lawrence A. Corp, and Kurt Thome "Radiometric calibration of G-LiHT's imaging spectrometer using GLAMR for satellite sensor intercalibration", Proc. SPIE 9607, Earth Observing Systems XX, 96070C (8 September 2015); https://doi.org/10.1117/12.2188763

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