Ilmar Ansko
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View article: Radiometric field inter-comparison of fiducial reference measurements using an open source community processor
Radiometric field inter-comparison of fiducial reference measurements using an open source community processor Open
A radiometric field intercomparison was conducted at the Acqua Alta Oceanographic Tower (AAOT) in the Adriatic Sea from 14 to 21 July 2022 to assess differences in the accuracy of above-water radiometer systems (Sea-Bird HyperSAS, pySAS, T…
View article: InGaAs-based transmission trap detector at telecom wavelengths
InGaAs-based transmission trap detector at telecom wavelengths Open
A photodetector based on two large-area InGaAs-photodiodes in transmission-type trap configuration has been studied. The alignment of the photodiodes provides polarisation-independent performance of the photodetector. The responsivity and …
View article: Complete characterization of ocean color radiometers
Complete characterization of ocean color radiometers Open
Verifying and validating waterleaving radiance measurements from space for an accurate derivation of Ocean/Water Colour biogeophysical products is based on concurrent high-quality fiducial reference measurements (FRM) carried out on the gr…
View article: Derivation of uncertainty budgets for continuous above-water radiometric measurements along an Atlantic Meridional Transect
Derivation of uncertainty budgets for continuous above-water radiometric measurements along an Atlantic Meridional Transect Open
Fiducial reference measurements are in-situ data traceable to metrology standards, with associated uncertainties. This paper presents the methodology used to derive the uncertainty budget for underway, above-water measurements from the Sea…
View article: Results from Verification of Reference Irradiance and Radiance Sources Laboratory Calibration Experiment Campaign
Results from Verification of Reference Irradiance and Radiance Sources Laboratory Calibration Experiment Campaign Open
We present the results from Verification of Reference Irradiance and Radiance Sources Laboratory Calibration Experiment Campaign. Ten international laboratories took part in the measurements. The spectral irradiance comparison included the…
View article: Comparison of Above-Water Seabird and TriOS Radiometers along an Atlantic Meridional Transect
Comparison of Above-Water Seabird and TriOS Radiometers along an Atlantic Meridional Transect Open
The Fiducial Reference Measurements for Satellite Ocean Color (FRM4SOC) project has carried out a range of activities to evaluate and improve the state-of-the-art in ocean color radiometry. This paper described the results from a ship-base…
View article: Field Intercomparison of Radiometer Measurements for Ocean Colour Validation
Field Intercomparison of Radiometer Measurements for Ocean Colour Validation Open
A field intercomparison was conducted at the Acqua Alta Oceanographic Tower (AAOT) in the northern Adriatic Sea, from 9 to 19 July 2018 to assess differences in the accuracy of in- and above-water radiometer measurements used for the valid…
View article: Optical Water Type Guided Approach to Estimate Optical Water Quality Parameters
Optical Water Type Guided Approach to Estimate Optical Water Quality Parameters Open
Currently, water monitoring programs are mainly based on in situ measurements; however, this approach is time-consuming, expensive, and may not reflect the status of the whole water body. The availability of Multispectral Imager (MSI) and …
View article: Example of Monte Carlo Method Uncertainty Evaluation for Above-Water Ocean Colour Radiometry
Example of Monte Carlo Method Uncertainty Evaluation for Above-Water Ocean Colour Radiometry Open
We describe a method to evaluate an uncertainly budget for the in situ Ocean Colour Radiometric measurements. A Monte Carlo approach is chosen to propagate the measurement uncertainty inputs through the measurements model. The measurement …
View article: Consistency of Radiometric Satellite Data over Lakes and Coastal Waters with Local Field Measurements
Consistency of Radiometric Satellite Data over Lakes and Coastal Waters with Local Field Measurements Open
The Sentinel-3 mission launched its first satellite Sentinel-3A in 2016 to be followed by Sentinel-3B and Sentinel-3C to provide long-term operational measurements over Earth. Sentinel-3A and 3B are in full operational status, allowing glo…
View article: Using Optical Water Types to Monitor Changes in Optically Complex Inland and Coastal Waters
Using Optical Water Types to Monitor Changes in Optically Complex Inland and Coastal Waters Open
The European Space Agency’s Copernicus satellites Sentinel-2 and Sentinel-3 provide observations with high spectral, spatial, and temporal resolution which can be used to monitor inland and coastal waters. Such waters are optically complex…
View article: Using Optical Water Types to Monitor Changes in Optically Complex Inland and Coastal Waters
Using Optical Water Types to Monitor Changes in Optically Complex Inland and Coastal Waters Open
Research article
View article: Field Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range
Field Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range Open
An intercomparison of radiance and irradiance ocean color radiometers (the second laboratory comparison exercise—LCE-2) was organized within the frame of the European Space Agency funded project Fiducial Reference Measurements for Satellit…
View article: Laboratory Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range
Laboratory Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range Open
An intercomparison of radiance and irradiance ocean color radiometers (The Second Laboratory Comparison Exercise—LCE-2) was organized within the frame of the European Space Agency funded project Fiducial Reference Measurements for Satellit…
View article: Implication of Illumination Beam Geometry on Stray Light and Bandpass Characteristics of Diode Array Spectrometer
Implication of Illumination Beam Geometry on Stray Light and Bandpass Characteristics of Diode Array Spectrometer Open
This paper describes spectral stray light measurements of diode array spectrometers and, in particular, the dependence of stray light and bandpass properties on the illumination beam geometry. The effects of underfilling and overfilling th…