In-Orbit Radiometric Calibration and Stability Monitoring of the PROBA-V Instrument

Sterckx, Sindy; Adriaensen, Stefan; Dierckx, Wouter; Bouvet, Marc

doi:10.3390/rs8070546

Cited by 13 publications

(14 citation statements)

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“…The long-term monitoring of the ratio (model/measurement) over these spectrally and radiometrically-stable desert sites allows for the estimation of the detector responsivity changes with time. For the VNIR strips, the detector response degradation is not significant during the first three years of the mission and well within the accuracy of the approach [17,18]. In contrast, for the short-wave infrared (SWIR) detectors a more significant degradation is observed: between −0.9% and −1.5% per year.…”

Section: Degradation Model For Swir Absolute Calibration Coefficientssupporting

confidence: 58%

“…Calibration over the Libya-4 desert site is used by the Image Quality Center (IQC) of PROBA-V to monitor the stability of the spectral bands and cameras of the instrument [17,18]. The approach relies on comparing the cloud-free TOA reflectance as measured by PROBA-V with modeled TOA reflectance values calculated following Govaerts et al [19].…”

Section: Degradation Model For Swir Absolute Calibration Coefficientsmentioning

confidence: 99%

“…">Inter-Camera Adjustments of VNIR Absolute Calibration CoefficientsThe PROBA-V instrument is composed of three separate cameras, with an overlap of about 75 visible and near infrared (VNIR) pixels between the left and the center camera and between the center and right cameras, respectively. For the camera-to-camera bias assessment, the overlap region between two adjacent cameras was exploited [17]. In order to improve the consistency between the three PROBA-V cameras, adjustments to the absolute calibration coefficients of the VNIR strips were implemented within the C0 near-real time (NRT) processing chain to correct for a band dependent camera-to-camera bias (Figure 1).…”

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confidence: 99%

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Evaluation of PROBA-V Collection 1: Refined Radiometry, Geometry, and Cloud Screening

et al. 2018

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PROBA-V (PRoject for On-Board Autonomy-Vegetation) was launched in May-2013 as an operational continuation to the vegetation (VGT) instruments on-board the Système Pour l'Observation de la Terre (SPOT)-4 and -5 satellites. The first reprocessing campaign of the PROBA-V archive from Collection 0 (C0) to Collection 1 (C1) aims at harmonizing the time series, thanks to improved radiometric and geometric calibration and cloud detection. The evaluation of PROBA-V C1 focuses on (i) qualitative and quantitative assessment of the new cloud detection scheme; (ii) quantification of the effect of the reprocessing by comparing C1 to C0; and (iii) evaluation of the spatio-temporal stability of the combined SPOT/VGT and PROBA-V archive through comparison to METOP/advanced very high resolution radiometer (AVHRR). The PROBA-V C1 cloud detection algorithm yields an overall accuracy of 89.0%. Clouds are detected with very few omission errors, but there is an overdetection of clouds over bright surfaces. Stepwise updates to the visible and near infrared (VNIR) absolute calibration in C0 and the application of degradation models to the SWIR calibration in C1 result in sudden changes between C0 and C1 Blue, Red, and NIR TOC reflectance in the first year, and more gradual differences for short-wave infrared (SWIR). Other changes result in some bias between C0 and C1, although the root mean squared difference (RMSD) remains well below 1% for top-of-canopy (TOC) reflectance and below 0.02 for the normalized difference vegetation index (NDVI). Comparison to METOP/AVHRR shows that the recent reprocessing campaigns on SPOT/VGT and PROBA-V have resulted in a more stable combined time series.are widely used to monitor environmental change and the evolution of vegetation cover in different thematic domains [2], hence the relevance to the continuity of the service.On board the PROBA-V, the optical instrument provides data at 1 km, 300 m, and 100 m consistent with the 1 km resolution data products of SPOT/VGT [3]. To support the existing SPOT/VGT user community, the PROBA-V mission continues provision of projected segments (Level 2A, similar to the SPOT/VGT P-products), daily top-of-canopy (TOC) synthesis (S1-TOC) and 10-day synthesis (S10-TOC) products. In addition, top-of-atmosphere (TOA) daily synthesis (S1-TOA) products and radiometrically/geometrically corrected data (level 1C) products in raw resolution (up to 100 m) are provided for scientific use [4,5]. Since PROBA-V has no onboard propellant, the overpass time (10:45 h at launch) will decrease as a result of increasing atmospheric drag [6].In previous years, vegetation monitoring applications were built on PROBA-V data, e.g., on cropland mapping [7], crop identification [8], estimation of biophysical parameters [9,10], and crop yield forecasting [11]. A method was also developed to assimilate data of PROBA-V 100 and 300 m [12]. For the Copernicus Global Land Service, PROBA-V is one of the prime sensors for operational vegetation products [13,14]. Access to and exploitation of the SPOT/...

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Section: Degradation Model For Swir Absolute Calibration Coefficientssupporting

confidence: 58%

Section: Degradation Model For Swir Absolute Calibration Coefficientsmentioning

confidence: 99%

mentioning

confidence: 99%

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Evaluation of PROBA-V Collection 1: Refined Radiometry, Geometry, and Cloud Screening

et al. 2018

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“…To our knowledge, cross-calibration results for Deimos-1 and PROBA-V with respect to S2 and LS8 have not been published before. In [27], PROBA-V was compared against MERIS, and strong consistency (within 2.5%) was indicated.…”

Section: Discussionmentioning

confidence: 99%

Radiometric Top-of-Atmosphere Reflectance Consistency Assessment for Landsat 8/OLI, Sentinel-2/MSI, PROBA-V, and DEIMOS-1 over Libya-4 and RadCalNet Calibration Sites

Sterckx

Wolters

2019

Remote Sensing

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There is a clear trend toward the use of higher spatial resolution satellite sensors. Due to the low revisit time of these sensors and frequent cloud coverage, many applications require data from different sensors to be combined in order to have more frequent observations. This raises concerns regarding data interoperability and consistency. The initial pre-requisite is that there are no radiometric differences in top-of-atmosphere (TOA) observations. This paper aims to quantitatively assess differences in the TOA signal provided by PROBA-V, Sentinel-2A and Sentinel-2B, Landsat-8, and Deimos-1 by using observations over both the Libya-4 desert calibration site and the RadCalNet sites. The results obtained over the Libya-4 site indicate that for all sensors investigated, the inter-sensor deviations are negligible, i.e., within ±2% for comparable spectral bands, with the exception of the Deimos-1 Green band. Clear BRDF (bi-directional reflectance distribution function) effects were observed over the RadCalNet sites, thereby preventing consistent conclusions on inter-sensor deviations from being made. In order to fully explore the potential of the RadCalNet sites, it is recommended that BRDF characterizations be additionally incorporated into the RadCalNet simulations and made publicly available through the distribution portal.

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“…The accuracy and stability of the calibration characteristics of satellite instruments are important for the development and sustainable automatic application of processing algorithms. During the operation of spacecraft, it is necessary to conduct regular flight calibration of instruments, for which various techniques are used [1][2][3][4].…”

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confidence: 99%

Histogram comparison crosscalibration method applied for evaluating the quality of “Canopus-v-ir” data

et al. 2020

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Regular onboard calibration of satellite data is of great practical importance for the processing of remote sensing information. For flight cross-calibration it is proposed to use a geostationary satellite as a reference to calibrate polar orbiting satellites data on the example of the "Canopus-V-IR" and Himawary satellites. Authors use data from center for collective use "IKI-Monitoring", united data catalogue of Planeta Research Centers for Space Hydrometeorology. The work has been done on theme «Monitoring»

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In-Orbit Radiometric Calibration and Stability Monitoring of the PROBA-V Instrument

Cited by 13 publications

References 15 publications

Evaluation of PROBA-V Collection 1: Refined Radiometry, Geometry, and Cloud Screening

Evaluation of PROBA-V Collection 1: Refined Radiometry, Geometry, and Cloud Screening

Radiometric Top-of-Atmosphere Reflectance Consistency Assessment for Landsat 8/OLI, Sentinel-2/MSI, PROBA-V, and DEIMOS-1 over Libya-4 and RadCalNet Calibration Sites

Histogram comparison crosscalibration method applied for evaluating the quality of “Canopus-v-ir” data

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