Absolute Calibration of Optical Satellite Sensors Using Libya 4 Pseudo Invariant Calibration Site

Mishra, Nischal; Helder, Dennis L.; Angal, Amit; Choi, Jason; Xiong, Xiaoxiong

doi:10.3390/rs6021327

Cited by 81 publications

(94 citation statements)

References 23 publications

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“…PICS-based calibration methods have been used by numerous researchers over an extended period of time [12,[14][15][16][17][18] A host of PICS sites have been endorsed by Committee on Earth Observation Satellites (CEOS) and these stable Earth-based sites have been used extensively to monitor the post-launch temporal stability of optical satellite sensors and for cross-calibration/inter-comparison purposes [12,[19][20][21][22][23]. In the cross-calibration method, the response of the sensor under investigation is compared against a reference sensor that is believed to be well calibrated over time [19,20,[24][25][26].…”

Section: Methods Overviewmentioning

confidence: 99%

Radiometric Cross Calibration of Landsat 8 Operational Land Imager (OLI) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+)

et al. 2014

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This study evaluates the radiometric consistency between Landsat-8 Operational Land Imager (OLI) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+) using cross calibration techniques. Two approaches are used, one based on cross calibration between the two sensors using simultaneous image pairs, acquired during an underfly event on 29-30 March 2013. The other approach is based on using time series of image statistics acquired by these two sensors over the Libya 4 pseudo invariant calibration site (PICS) (+28.55°N, +23.39°E). Analyses from these approaches show that the reflectance calibration of OLI is generally within ±3% of the ETM+ radiance calibration for all the reflective bands from visible to short wave infrared regions when the ChKur solar spectrum is used to convert the ETM+ radiance to reflectance. Similar results are obtained comparing the OLI radiance calibration directly with the ETM+ radiance calibration and the results in these two different physical units (radiance and reflectance) agree to within ±2% for all the analogous bands. OPEN ACCESSRemote Sens. 2014, 6 12620 These results will also be useful to tie all the Landsat heritage sensors from Landsat 1 MultiSpectral Scanner (MSS) through Landsat-8 OLI to a consistent radiometric scale.

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Section: Methods Overviewmentioning

confidence: 99%

Radiometric Cross Calibration of Landsat 8 Operational Land Imager (OLI) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+)

et al. 2014

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“…The PICS have been used for on-orbit radiometric trending of optical satellite for more than 15 years [14]. According to [15], the advantages of using these sites are their stable spectral characteristics over time, high reflectance, and minimal atmospheric effect on upward radiance. Several sites have been developed and include locations in Libya, Algeria, Niger and Mauritania.…”

Section: Cross-calibrationmentioning

confidence: 99%

“…According to [15], once spectral equivalency has been performed using the SBAF technique, for a stable atmosphere, the in-band reflectance can be directly compared to determine the differences between the sensors. Thus, the percentage differences were estimated between the well calibrated ETM+ and the at-sensor reflectance reported by the current calibration of MUX and WFI on-board CBERS-4 (see Equation (9)).…”

Section: Radiometric Coefficients Validationmentioning

confidence: 99%

First in-Flight Radiometric Calibration of MUX and WFI on-Board CBERS-4

et al. 2016

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Brazil and China have a long-term joint space based sensor program called China-Brazil Earth Resources Satellite (CBERS). The most recent satellite of this program (CBERS-4) was successfully launched on 7 December 2014. This work describes a complete procedure, along with the associated uncertainties, used to calculate the in-flight absolute calibration coefficients for the sensors Multispectral Camera (MUX) and Wide-Field Imager (WFI) on-board CBERS-4. Two absolute radiometric calibration techniques were applied: (i) reflectance-based approach and (ii) cross-calibration method. A specific site at Algodones Dunes region located in the southwestern portion of the United States of America was used as a reference surface. Radiometric ground and atmospheric measurements were carried out on 9 March 2015, when CBERS-4 passed over the region. In addition, a cross-calibration between both MUX and WFI on-board CBERS-4 and the Operational Land Imager (OLI) on-board Landsat-8 was performed using the Libya-4 Pseudo Invariant Calibration Site. The gain coefficients are now available: 1.68, 1.62, 1.59 and 1.42 for MUX and 0.379, 0.498, 0.360 and 0.351 for WFI spectral bands blue, green, red and NIR, respectively, in units of (W/(m 2¨s r¨µm))/DN. These coefficients were determined with uncertainties lower than 3.5%. As a validation of these radiometric coefficients, cross-calibration was also undertaken. An evaluation of radiometric consistency was performed between the two instruments (MUX and WFI) on-board CBERS-4 and with the well calibrated Landsat-7 ETM+. Results show that the reflectance values match in all the analogous spectral bands within the specified calibration uncertainties.

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“…More details on the PICSs can be found in Helder et al (2010). In the past these sites have been widely used in post launch calibration and validation of satellite sensors (e.g., Smith and Cox, 2013;Mishra et al, 2014;Sun et al, 2014;Uprety and Cao, 2015). Fortunately, in this area the impact of the ERS-2 tape recorder failure in June 2003 is quite small, so that the time series are almost complete with only a short gap in 2003.…”

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confidence: 99%

The Global Ozone Monitoring Experiment: Review of in-flight performance and new reprocessed 1995–2011 level 1 product

Coldewey‐Egbers¹,

Slijkhuis²,

Aberle³

et al. 2018

Preprint

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Abstract. The Global Ozone Monitoring Experiment (GOME) on-board the second European Remote Sensing satellite provided measurements of atmospheric constituents such as ozone or other trace gases for the 16 year period from 1995 to 2011.In this paper we present a detailed analysis of the long-term performance of the sensor and introduce the new homogenized and fully calibrated level 1 product which has been generated using the recently developed GOME Data Processor level-0-to-1b (GDP-L1) Version 5.1. By means of the various in-flight calibration parameters we monitor the behavior and stability of the in-5 strument during the entire mission. Severe degradation of the optical components has led to a significant decrease in intensity in particular in channels 1 and 2 covering the spectral ranges of 240-316 nm and 311-405 nm, respectively. Thus, a soft correction based on using the sun as a stable calibration source is applied. Revision and optimization of other calibration algorithms such as the wavelength assignment, polarization correction, or dark current correction resulted in an improved and homogeneous level 1 product that can be regarded as the European satellite reference data for successor atmospheric composition sensors and 10 that provides an excellent prerequisite for further exploitation of GOME measurements.

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Absolute Calibration of Optical Satellite Sensors Using Libya 4 Pseudo Invariant Calibration Site

Cited by 81 publications

References 23 publications

Radiometric Cross Calibration of Landsat 8 Operational Land Imager (OLI) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+)

Radiometric Cross Calibration of Landsat 8 Operational Land Imager (OLI) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+)

First in-Flight Radiometric Calibration of MUX and WFI on-Board CBERS-4

The Global Ozone Monitoring Experiment: Review of in-flight performance and new reprocessed 1995–2011 level 1 product

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