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Proceedings Paper

Radiometric calibration of G-LiHT's imaging spectrometer using GLAMR for satellite sensor intercalibration
Author(s): Amit Angal; Joel McCorkel; Bruce Cook; Lawrence A. Corp; Kurt Thome
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Paper 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.

Paper Details

Date Published: 8 September 2015
PDF: 9 pages
Proc. SPIE 9607, Earth Observing Systems XX, 96070C (8 September 2015); doi: 10.1117/12.2188763
Show Author Affiliations
Amit Angal, Science Systems and Applications, Inc. (United States)
Joel McCorkel, NASA Goddard Space Flight Ctr. (United States)
Bruce Cook, NASA Goddard Space Flight Ctr. (United States)
Lawrence A. Corp, Science Systems and Applications, Inc. (United States)
Kurt Thome, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9607:
Earth Observing Systems XX
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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