Laboratory Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range.


Contact
Astrid.Bracher [ at ] awi.de

Abstract

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 Satellite Ocean Color (FRM4SOC) May 8–13, 2017 at Tartu Observatory, Estonia. LCE-2 consisted of three sub-tasks: 1) SI-traceable radiometric calibration of all the participating radiance and irradiance radiometers at the Tartu Observatory just before the comparisons; 2) Indoor intercomparison using stable radiance and irradiance sources in controlled environment; and 3) Outdoor intercomparison of natural radiation sources over terrestrial water surface. The aim of the experiment was to provide one link in the chain of traceability from field measurements of water reflectance to the uniform SI-traceable calibration, and after calibration to verify whether di�erent instruments measuring the same object provide results consistent within the expected uncertainty limits. This paper describes the activities and results of the first two phases of LCE-2: the SI-traceable radiometric calibration and indoor intercomparison, the results of outdoor experiment are presented in a related paper of the same journal issue. The indoor experiment of the LCE-2 has proven that uniform calibration just before the use of radiometers is highly e�ective. Distinct radiometers from di�erent manufacturers operated by di�erent scientists can yield quite close radiance and irradiance results (standard deviation s < 1%) under defined conditions. This holds when measuring stable lamp-based targets under stationary laboratory conditions with all the radiometers uniformly calibrated against the same standards just prior to the experiment. In addition, some unification of measurement and data processing must be settled. Uncertaint of radiance and irradiance measurement under these conditions largely consists of the sensor’s calibration uncertainty and of the spread of results obtained by individual sensors measuring the same object.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
49693
DOI 10.3390/rs11091101

Cite as
Vabson, V. , Kuusk, J. , Ansko, I. , Vendt, R. , Alikas, K. , Ruddick, K. , Ansper, A. , Bresciani, M. , Burmester, H. , Costa, M. , D'Alimonte, D. , Dall'Olmo, G. , Damiri, B. , Dinter, T. , Giardino, C. , Kangro, K. , Ligi, M. , Paavel, B. , Tilstone, G. , Van Dommelen, R. , Wiegmann, S. , Bracher, A. , Donlon, C. and Casal, T. (2019): Laboratory Intercomparison of Radiometers Used for Satellite Validation in the 400–900 nm Range. , Remote Sensing, 11 (1101), pp. 1-24 . doi: 10.3390/rs11091101


Download
[img]
Preview
PDF
remotesensing-11-01101.pdf

Download (3MB) | Preview

Share


Citation

Research Platforms

Campaigns


Actions
Edit Item Edit Item