University of Tasmania
Browse
131183 - Influence of cosine corrector and UAS platform dynamics on airborne spectral irradiance measurements.pdf (1.09 MB)

Influence of cosine corrector and UAS platform dynamics on airborne spectral irradiance measurements

Download (1.09 MB)
conference contribution
posted on 2023-05-23, 13:59 authored by Juliane Bendig, Gautam, D, Zbynek MalenovskyZbynek Malenovsky, Arko LucieerArko Lucieer
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.

Funding

Australian Research Council

History

Publication title

Proceedings of the 2018 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2018)

Pagination

8822-8825

ISBN

978-1-5386-7150-4

Department/School

School of Geography, Planning and Spatial Sciences

Publisher

Institute of Electrical and Electronics Engineers

Place of publication

United States

Event title

2018 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2018)

Event Venue

Valencia, Spain

Date of Event (Start Date)

2018-07-22

Date of Event (End Date)

2018-07-27

Rights statement

Copyright 2018 IEEE

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the environmental sciences