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Influence of cosine corrector and UAS platform dynamics on airborne spectral irradiance measurements
Citation
Bendig, J and Gautam, D and Malenovsky, Z and Lucieer, A, Influence of cosine corrector and UAS platform dynamics on airborne spectral irradiance measurements, Proceedings of the 2018 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2018), 22-27 July 2018, Valencia, Spain, pp. 8822-8825. ISBN 978-1-5386-7150-4 (2018) [Refereed Conference Paper]
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Copyright Statement
Copyright 2018 IEEE
DOI: doi:10.1109/IGARSS.2018.8518864
Abstract
Measuring solar-induced chlorophyll fluorescence from small-sized Unmanned Aircraft Systems (UAS) can potentially fill the scaling gap between ground-based and airborne/space-borne observations. These measurements require well calibrated' high-spectral resolution spectroradiometers and precise measurements of vegetation radiance and incoming solar irradiance. Here we present a system equipped with a spectroradiometer with a split optical path that measures incoming irradiance through a cosine corrector/diffuser. The objectives of this study are to characterise cosine corrected solar irradiance measurements with regard to sensor homogeneity and possible offset from an ideal cosine response. We further suggest a methodology to calculate a corrected zenith angle that accounts for changing sensor orientation due to pitch, roll and heading of the UAS platform during flight. We found that the cosine corrector is sufficiently homogeneous, thus measurements are independent of UAS heading. The response follows the cosine law for zenith angles, however, the sensor significantly underestimated irradiance for zenith angles > 10°, with overall cosine errors ranging from 0.991 to 1.229. Yet, typical in-flight platform pitch and roll angles produce a zenith angle offset of up to 6° in low wind conditions. Cosine sensor measurements corrected for the zenith angle offset and the cosine error resulted in a 1.7 % change in irradiance.
Item Details
| Item Type: | Refereed Conference Paper |
|---|---|
| Keywords: | spectroradiometer, solar-induced chlorophyll fluorescence, unmanned aircraft system, sun zenith angle, irradiance cosine corrector, UAS, drone, SIF |
| Research Division: | Engineering |
| Research Group: | Geomatic engineering |
| Research Field: | Photogrammetry and remote sensing |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the environmental sciences |
| UTAS Author: | Bendig, J (Ms Juliane Bendig) |
| UTAS Author: | Gautam, D (Mr Deepak Gautam) |
| UTAS Author: | Malenovsky, Z (Dr Zbynek Malenovsky) |
| UTAS Author: | Lucieer, A (Professor Arko Lucieer) |
| ID Code: | 131183 |
| Year Published: | 2018 |
| Funding Support: | Australian Research Council (DP140101488) |
| Deposited By: | Geography and Spatial Science |
| Deposited On: | 2019-03-06 |
| Last Modified: | 2022-08-23 |
| Downloads: | 35 View Download Statistics |
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