期刊
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
卷 146, 期 -, 页码 376-390出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2014.04.011
关键词
Bidirectional reflectance; BRF; Spectrum; Polarisation; Calibration
资金
- Academy of Finland Projects [120949, 260027]
- European Commission Project Norsen
- European Commission ERC Grant SAEMPL
- Ministry of Agriculture and Forestry
- EMRP
- EMRP within EURAMET
- EMRP within European Union
- Academy of Finland (AKA) [120949, 260027, 120949, 260027] Funding Source: Academy of Finland (AKA)
The measurement uncertainty and traceability of the Finnish Geodetic Institutes's field gonio-spectro-polarimeter FIGIFIGO have been assessed. First, the reference standard (Spectralon sample) was measured at the National Standard Laboratory of MIKES-Aalto. This standard was transferred to FGI's field reference standard (larger Spectralon sample), and from that to the unmanned aerial vehicle (UAV), reference standards (1 m(2) plates). The reflectance measurement uncertainty of FIGIFIGO has been estimated to be 0.01 in ideal laboratory conditions, but about 0.02-0.05 in typical field conditions, larger at larger solar or observation zenith angles. Target specific uncertainties can increase total uncertainty even to 0.1-0.2. The angular reading uncertainty is between 1 degrees and 3 degrees, depending on user selection, and the polarisation uncertainty is around 0.01. For UAV, the transferred reflectance uncertainty is about 0.05-0.1, depending on, how ideal the measurement conditions are. The design concept of FIGIFIGO has been proved to have a number of advantages, such as a well-adopted user-friendly interface, a high level of automation and excellent suitability for the field measurements. It is a perfect instrument for collection of reference data on a given target in natural (and well-recorded) conditions. In addition to the strong points of FIGIFIGO, the current study reveals several issues that need further attention, such as the field of view, illumination quality, polarisation calibration, Spectralon reflectance and polarisation properties in the 1000-2400 nm range. (C) 2014 Elsevier Ltd. All rights reserved.
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