Terrestrial reference standard sites for postlaunch sensor calibration

Teillet, Philippe; Chander, Gyanesh

doi:10.5589/m10-079

Cited by 24 publications

(13 citation statements)

References 137 publications

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“…[3][4][5] Most of the CEOS test sites are located in the desert areas with a set of desirable requirements, e.g., spatial uniformity, minimum surface reflectance of 0.3, high signal-to-noise ratio, spectrally flat surface, small seasonal bi-directional reflectance distribution function, near Lambertian surface, and low aerosol loading. These pseudo-invariant calibration sites (PICS) have been recommended by the Committee on Earth Observation Satellites (CEOS).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the spectral stability of Libya 4, Libya 1, and Mauritania 2 sites using Earth Observing One Hyperion

Choi

Xiong

Angal

et al. 2014

J. Appl. Remote Sens

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The objective of this paper is to formulate a methodology to assess the spectral stability of the Libya 4, Libya 1, and Mauritania 2 pseudo-invariant calibration sites (PICS) using Earth Observing One (EO-1) Hyperion sensor. All the available Hyperion collections, downloaded from the Earth Explorer website, were utilized for the three PICS. In each site, a reference spectrum is selected at a specific day in the vicinity of the region of interest (ROI) defined by Committee on Earth Observation Satellites (CEOS). A series of ROIs are predefined in the along-track direction with 196 spectral top-of-atmosphere reflectance values in each ROI. Based on the reference ROI spectrum, the spectral stability of these ROIs is evaluated by average deviations (ADs) and spectral angle mapper (SAM) methods in the specific ranges of time and geo-spatial locations. Time and ROI location-dependent SAM and AD results are very stable within AE2 deg and AE1.7% of 1σ standard deviations. Consequently, the Libya 4, Mauritania 2, and Libya 1 CEOS selected PICS are spectrally stable targets within the time and spatial swath ranges of the Hyperion collections.

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Section: Introductionmentioning

confidence: 99%

Assessment of the spectral stability of Libya 4, Libya 1, and Mauritania 2 sites using Earth Observing One Hyperion

Choi

Xiong

Angal

et al. 2014

J. Appl. Remote Sens

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“…Libya-4 was one of the six PICS recommended by the CEOS Working Group on Calibration and Validation (WGCV) [23] along with Mauritania-1, Mauritania-2, Algeria-3, Algeria-5, and Libya-1. It is located in the Great Sand Sea (28.55 • N, 23.39 • E) at an average height of 118 m above sea level.…”

Section: Study Areamentioning

confidence: 99%

Analysis of Spatial and Temporal Variability in Libya-4 with Landsat 8 and Sentinel-2 Data for Optimized Ground Target Location

et al. 2019

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Pseudo-Invariant Calibration Sites (PICS) have been widely used by the remote sensing community in recent decades for post-launch absolute calibration, cross-calibration, and the monitoring of radiometric stability. The Committee on Earth Observation Satellites (CEOS) has established several official PICS for these purposes. Of these, Libya-4 is the most commonly used, due to its high uniformity and stability. The site was chosen as a large-area site for medium resolution sensors, and with high-resolution sensors now common, smaller sites are being identified. This work has identified an improved area of interest (AOI) within Libya-4 by using combined Landsat 8 and Sentinel 2 data. The Optimized Ground Target (OGT) was determined by calculating the coefficient of variation along with the use of a quasi-Newton optimization algorithm combined with the Basin–Hopping global optimization technique to constrain a search area small enough to perform a final brute-force refinement. The Coefficient of Variation CV of the proposed OGT is significantly lower than that in the original CEOS area, with differences between the CV of both zones in the order of 1% in the visible near-infrared (VNIR) bands. This new AOI has the potential to improve the cross-calibration between high-resolution sensors using the PICS methodology through an OGT with more homogeneous and stable characteristics.

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“…The Committee on Earth Observation Satellites Working Group on Calibration and Validation (CEOS WGCV) identified a set of PICSs (see Fig. 1) in the African deserts [1], whereas other types of PICSs such as Antarctic ice [8] are also widely found in similar investigations.…”

Section: Introductionmentioning

confidence: 99%

“…I N AN era with more urgent requirements on satellite data quality and consistency, it is crucial to achieve intersensor consistency of radiometric calibration between satellite sensors [1]- [3]. pseudo-invariant calibration sites (PICSs) have been long adopted for degradation monitoring and calibration [4], [5], and intercomparisons [6], [7] for their unique role in cal- ibrating historic data from sensors without onboard calibration facilities such as the Advanced Very High Resolution Radiometer (AVHRR) [4], and its competitive performance and cost effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Using SeaWiFS Measurements to Evaluate Radiometric Stability of Pseudo-Invariant Calibration Sites at Top of Atmosphere

Xue

Liu

et al. 2015

IEEE Geosci. Remote Sensing Lett.

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The Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) data from 1997 to 2001 are adopted to monitor the radiometric stability of six pseudo-invariant calibration sites (PICSs) at the top of atmosphere (TOA). Cloud-free and homogeneous observations of the spectral TOA reflectance ρ TOA at eight SeaWiFS channels over these sites are fitted to the Ross-Li bidirectional reflectance distribution function (BRDF) model, and the time series of BRDF-normalized spectral TOA reflectance R TOA is presented and analyzed afterward. Overall, good stability during the evaluated period is exhibited as more than half of the derived trends are statistically insignificant, whereas root mean square (RMS) of the BRDF modeling residuals reveal spectral dependence of the PICSs' stability at TOA, i.e., the uncertainty of R TOA appears to be larger at shortwave visible (SV) channels (∼2.5%) compared with that of red/NIR bands (∼1%). In addition, the early mission data adopted in our study shows favorable reliability thus is recommended to be applied for similar purposes.

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Terrestrial reference standard sites for postlaunch sensor calibration

Cited by 24 publications

References 137 publications

Assessment of the spectral stability of Libya 4, Libya 1, and Mauritania 2 sites using Earth Observing One Hyperion

Assessment of the spectral stability of Libya 4, Libya 1, and Mauritania 2 sites using Earth Observing One Hyperion

Analysis of Spatial and Temporal Variability in Libya-4 with Landsat 8 and Sentinel-2 Data for Optimized Ground Target Location

Using SeaWiFS Measurements to Evaluate Radiometric Stability of Pseudo-Invariant Calibration Sites at Top of Atmosphere

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