The selection of appropriate spectrally bright pseudo-invariant ground targets for use in empirical line calibration of SPOT satellite imagery

Clark, Barnaby; Suomalainen, Juha; Pellikka, Petri

doi:10.1016/j.isprsjprs.2011.02.003

Cited by 18 publications

(13 citation statements)

References 37 publications

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“…The concept of target stability in space and time is particularly appropriate when vicarious calibration s. s. is applied to multi-temporal datasets (Brook & Ben-Dor, 2011;Clark et al, 2011b). In our case, ground calibration targets have not to be considered as pseudo-invariant in time and space because their employment is limited to the present dataset and the field survey is concomitant with the overflight.…”

Section: Selection Of Appropriate Cal/val Targetsmentioning

confidence: 99%

“…We understand that vegetated terrains have non-Lambertian reflectance behaviour. Nevertheless, real surfaces display non-Lambertian reflectance behaviour to some extent (Clark et al, 2011b;Pinter, Jackson, & Moran, 1990;Smith & Milton, 1999).…”

Section: Selection Of Appropriate Cal/val Targetsmentioning

confidence: 99%

“…In the present work, we use vicarious calibration methods to achieve absolute atmospheric correction by empirically evaluating the relationship between atsensor radiance (L SS ) and field measurements of surface reflectance (ρ s ), assuming this relationship is linear (Clark, Suomalainen, & Pellikka, 2011b). Therefore we acquire reflectance measurements of ground targets during (or close in time to) the sensor overpass, thus to represent the spectral variability collected from remote and to ensure a wide dynamic range of albedo to be covered.…”

Section: Introductionmentioning

confidence: 99%

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Application of the empirical line method (ELM) to calibrate the airborne Daedalus-CZCS scanner

Pompilio

Marinangeli

Amitrano³

et al. 2017

European Journal of Remote Sensing

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The present investigation aims at providing a reliable evaluation of the geometric and radiometric accuracy of the airborne Daedalus-Coastal Zone Color Scanner (CZCS), through cal/val techniques. To this aim, on November 2014, we accomplished a remote sensing campaign over the Peligna Valley (Italy). Together with the personnel of the III Nucleo Aereo of the Italian Coast Guard, based at the Pescara Airport, we deployed the Daedalus AA1268EM1 CZCS scanner on board the fixed-wing aircraft type ATR42MP and a ASD FieldSpec spectroradiometer for a simultaneous field survey. We used vicarious calibration and secondary non-parametric geometric correction to achieve absolute atmospheric correction and geometric calibration, respectively. Although the validation and calibration targets used in this study were similar in nature, correlation coefficients of the prediction equations between at-sensor radiance and ground reflectance were > 0.90 for each of the 10 CZCS wavebands and the independent error assessment demonstrate that the empirical line method can be applied to correct CZCS imagery with satisfactory results. ARTICLE HISTORY

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Section: Selection Of Appropriate Cal/val Targetsmentioning

confidence: 99%

Section: Selection Of Appropriate Cal/val Targetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of the empirical line method (ELM) to calibrate the airborne Daedalus-CZCS scanner

Pompilio

Marinangeli

Amitrano³

et al. 2017

European Journal of Remote Sensing

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“…When performing ASD FieldSpec ® 3 measurements, it is important to use appropriate observation geometries and measurement times. To normalize the reflectance and reduce the BRDFs caused by the differences in the ASD FieldSpec ® 3 geometry and the changeable KOMPSAT-3A geometry [25], we fixed the ASD observation geometry in the direction of the nadir. Then, we carefully measured the spectra of the radiometric tarps using the ASD FieldSpec ® 3.…”

Section: Asd Fieldspec ® 3 Measurements Of the Hyperspectral Reflectamentioning

confidence: 99%

Initial Radiometric Characteristics of KOMPSAT-3A Multispectral Imagery Using the 6S Radiative Transfer Model, Well-Known Radiometric Tarps, and MFRSR Measurements

et al. 2017

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On-orbit radiometric characterization of the multispectral (MS) imagery of the Korea Aerospace Research Institute (KARI)'s Korea Multi-Purpose Satellite-3A (KOMPSAT-3A), which was launched on 25 March 2015, was conducted to provide quantitative radiometric information about KOMPSAT-3A. During the in-orbit test (IOT), vicarious radiometric calibration of KOMPSAT-3A was performed using the Second Simulation of a Satellite Signal in the Solar Spectrum (6S) radiative transfer model. The characteristics of radiometric tarps, the atmospheric optical depth from multi-filter rotating shadowband radiometer (MFRSR) measurements, and sun-sensor-geometry were carefully considered, in order to calculate the exact top of atmosphere (TOA) radiance received by KOMPSAT-3A MS bands. In addition, the bidirectional reflectance distribution function (BRDF) behaviors of the radiometric tarps were measured in the laboratory with a two-dimensional hyperspectral gonioradiometer, to compensate for the geometry discrepancy between the satellite and the ASD FieldSpec ® 3 spectroradiometer. The match-up datasets between the TOA radiance and the digital number (DN) from KOMPSAT-3A were used to determine DN-to-radiance conversion factors, based on linear least squares fitting for two field campaigns. The final results showed that the R 2 values between the observed and simulated radiances for the blue, green, red, and near-infrared (NIR) bands, are greater than 0.998. An approximate error budget analysis for the vicarious calibration of KOMPSAT-3A showed an error of less than 6.8%. When applying the laboratory-based BRDF correction to the case of higher viewing zenith angle geometry, the gain ratio was improved, particularly for the blue (1.3%) and green (1.2%) bands, which exhibit high sensitivity to the BRDF of radiometric tarps during the backward-scattering phase. The calculated gain ratio between the first and second campaigns showed a less than 5% discrepancy, indicating that the determined radiometric characteristics of KOMPSAT-3A are reliable and useful to the user group for quantitative applications.

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“…The key ideas underlying our field data acquisition-storage work-flow are that: (a) acquisition planning: the more focused is the field survey, the more accurate is the retrieval of information from image analysis; (b) storing data: storing well documented measurements in proper data repositories will provide guidelines for planning future surveys and eventually identifying spectral pseudo-invariant features at their locations [17]; (c) flagging data: provide proper metadata, as the relational reference table to the repository of measurements will allow both data providers and users to interact with an interoperable database making easy to discover and access data, even through the internet; (d) exploiting spectral library: using such approach to carry out spectroradiometric field surveys with the special purpose of remote sensors' calibration/validation has the invaluable advantages of allowing the best target selection as possible and avoiding redundancy.…”

Section: Introductionmentioning

confidence: 99%

Spectroradiometric Field Surveys in Remote Sensing Practice: A Workflow Proposal, from Planning to Analysis

Pompilio

Villa

Boschetti

et al. 2013

IEEE Geosci. Remote Sens. Mag.

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Spectroradiometric field surveys, especially when addressed at heterogeneous targets and within a complex environmental context, require careful organization and structuring. This work focuses on a proposal of an operational workflow that holds together different aspects of in situ spectral data acquisition, from planning to data analysis, and is ancillary to environmental analysis based on remote sensing. The main objective is the enhancement of the information coming from acquired spectra, which is accomplished through a set of established guidelines for: campaign planning, measurement collection, and data management. The feasibility and advantages of such approach are demonstrated through a real case scenario, covering two spectroradiometric campaigns aimed at geolithology studies and performed in September 2010 and 2011 in the Dolomites (Northern Italy), where complex environmental and variable atmospheric conditions, as well as, large target variability and spectral heterogeneity occur. The workflow here adopted allowed us to face all the challenges in order to usefully accomplish our campaigns. Issues commonly arising in spectroradiometric field activities are easily foreseen, tackled and mitigated, if necessary, while preserving a high degree of flexibility and generalization for exploiting the workflow over heterogeneous areas and application fields.

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The selection of appropriate spectrally bright pseudo-invariant ground targets for use in empirical line calibration of SPOT satellite imagery

Cited by 18 publications

References 37 publications

Application of the empirical line method (ELM) to calibrate the airborne Daedalus-CZCS scanner

Application of the empirical line method (ELM) to calibrate the airborne Daedalus-CZCS scanner

Initial Radiometric Characteristics of KOMPSAT-3A Multispectral Imagery Using the 6S Radiative Transfer Model, Well-Known Radiometric Tarps, and MFRSR Measurements

Spectroradiometric Field Surveys in Remote Sensing Practice: A Workflow Proposal, from Planning to Analysis

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