The Operational Land Imager-2: prelaunch spectral characterization

Barsi, Julia A.; Markham, Brian L.; McCorkel, Joel; McAndrew, Brendan; Donley, Eric; Morland, Eric; Pharr, James; Rodriguez, Michael; Shuman, Timothy; Sushkov, A. B.; Zukowski, Barbara

doi:10.1117/12.2529776

Cited by 10 publications

(6 citation statements)

References 6 publications

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“…The Landsat 9 OLI onboard radiometric calibration system is identical to that of Landsat 8 OLI, and the various subsystems include a shutter for dark measurements, two solar diffusers (working and pristine), two stimulation lamp assemblies, and the ability to view the moon through a spacecraft maneuver [2,5]. As with the Landsat 8 OLI, the Landsat 9 OLI underwent a rigorous pre-launch calibration and characterization process [6][7][8][9][10].…”

Section: Bandmentioning

confidence: 99%

The Ground-Based Absolute Radiometric Calibration of the Landsat 9 Operational Land Imager

Czapla-Myers,

Thome,

Anderson

et al. 2024

Remote Sensing

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This paper presents the initial vicarious radiometric calibration results for Landsat 9 OLI using a combination of ground-based techniques and test sites located in Nevada, California, and South Dakota, USA. The field data collection methods include the traditional reflectance-based approach and the automated Radiometric Calibration Test Site (RadCaTS). The results for top-of-atmosphere spectral radiance show an average ratio (OLI/ground measurements) of 1.03, 1.01, 1.00, 1.02, 1.02, 1.01, 0.98, and 1.01 for Landsat 9 OLI bands 1–8, which is within the design specification of ±5% for spectral radiance. The results for top-of-atmosphere reflectance show an average ratio (OLI/ground measurements) of 0.99, 0.99, 1.00, 1.02, 1.01, 1.02, 1.00, and 1.00 for Landsat 9 OLI bands 1–8, which is within the design specification of ±3% for top-of-atmosphere reflectance.

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Section: Bandmentioning

confidence: 99%

The Ground-Based Absolute Radiometric Calibration of the Landsat 9 Operational Land Imager

Czapla-Myers,

Thome,

Anderson

et al. 2024

Remote Sensing

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“…The total uncertainty is provided in Figure 3. This section will describe the improvement in select elements of the uncertainty budget since the test of the Landsat Operational Land Imager-2 in 2018 [11,12].…”

Section: Uncertaintymentioning

confidence: 99%

Spectral and radiometric performance of the Goddard laser for absolute measurement of radiance

Barsi,

McCorkel,

McAndrew

et al. 2023

Earth Observing Systems XXVIII

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The Goddard Laser for Absolute Measurement of Radiance (GLAMR) is a mobile spectral and radiometric sensor characterization facility based at NASA/Goddard Space Flight Center. Based on NIST’s traveling Spectral Irradiance and Radiance Calibration using Uniform Sources (SIRCUS), GLAMR consists of a system of tunable lasers to generate quasi-monochromatic energy between 310 and 2500nm, a large integrating sphere to provide a full aperture uniform source, a control system to automate operations and a data system to record and serve telemetry. GLAMR was used to characterize the Ocean Color Instrument (OCI) to be launched aboard the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission. The test of the OCI flight instrument took place in October 2022. GLAMR will be used to characterize the CLARREO Pathfinder (CPF) instrument in September 2023. Both programs had stringent calibration requirements on GLAMR, necessitating additional characterization of GLAMR radiometric uncertainty and improvements in the NIST traceability. This paper will discuss the improvement in the GLAMR uncertainty budget and the performance of GLAMR for the OCI instrument as well as the upcoming test for CPF.

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“…Radiometric sources used are typically SI‐traceable FEL lamps with a 10 or more cm aperture integrating sphere. It is possible to combine radiometric and spectral responses during characterization using a tunable laser reference (Ahtee et al., 2007), such as spectral irradiance and radiance responsivity calibrations using uniform sources (SIRCUS) (Brown et al., 2006) or Traveling SIRCUS (T‐SIRCUS) or the Goddard Laser for Absolute Measurement of Radiance systems (Angal et al., 2016; Barsi et al., 2019). This combined radiometric and spectral response is called the absolute spectral response (Barnes et al., 2015).…”

Section: Pre‐launch Characterization and Calibrationmentioning

confidence: 99%

Calibration and Validation for the Surface Biology and Geology (SBG) Mission Concept: Recommendations for a Multi‐Sensor System for Imaging Spectroscopy and Thermal Imagery

Turpie,

Casey,

Crawford

et al. 2023

JGR Biogeosciences

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The primary objective of the NASA Surface Biology and Geology (SBG) mission is to measure biological, physical, chemical, and mineralogical features of the Earth’s surface, realizing a key conceptual component of the envisioned NASA Earth System Observatory (ESO). SBG is planned to launch as a two‐platform mission in the late 2020s, the first of the ESO satellites. Targeted science and applications objectives based on observations of the Earth’s surface biology and geology helped to define the mission architecture and instrument capabilities for the SBG mission concept. These objectives further drove the need for enabling change detection and trending of surface biological and geological features. These needs implied fundamental calibration goals to achieve the necessary science data quality characteristics. To meet those goals, calibration and validation pre‐launch and on‐orbit methods formed a basis of the calibration and validation concept, including the combined use of on‐board references, vicarious techniques, and routine lunar imaging. International collaboration with space agencies in other countries, an important feature of the recommended SBG mission architecture, uncovered and emphasized the need for inter‐calibration techniques that underscored the importance of collaborative instrument characterization data sharing and the use of common calibration references that are International System of Units (SI) traceable in pre‐launch and post‐launch on orbit calibration mission phases. International collaboration through the use of terrestrial and aquatic networks on six continents for vicarious calibration and validation activities will further assure necessary science data quality while in orbit.

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The Operational Land Imager-2: prelaunch spectral characterization

Cited by 10 publications

References 6 publications

The Ground-Based Absolute Radiometric Calibration of the Landsat 9 Operational Land Imager

The Ground-Based Absolute Radiometric Calibration of the Landsat 9 Operational Land Imager

Spectral and radiometric performance of the Goddard laser for absolute measurement of radiance

Calibration and Validation for the Surface Biology and Geology (SBG) Mission Concept: Recommendations for a Multi‐Sensor System for Imaging Spectroscopy and Thermal Imagery

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