Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral Camera
The use of unmanned aerial vehicles (UAVs) for Earth and environmental sensing has increased significantly in recent years. This is particularly true for multi- and hyperspectral sensing, with a variety of both push-broom and snap-shot systems becoming available. However, information on their radiom...
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doaj-2501ddcb50a14d4ca546e50c33abb35e2020-11-25T01:41:44ZengMDPI AGSensors1424-82202019-10-011921469910.3390/s19214699s19214699Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral CameraM. Alejandra P. Barreto0Kasper Johansen1Yoseline Angel2Matthew F. McCabe3Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Al Jazri Building West, Thuwal 23955-6900, Saudi ArabiaWater Desalination and Reuse Center, King Abdullah University of Science and Technology, Al Jazri Building West, Thuwal 23955-6900, Saudi ArabiaWater Desalination and Reuse Center, King Abdullah University of Science and Technology, Al Jazri Building West, Thuwal 23955-6900, Saudi ArabiaWater Desalination and Reuse Center, King Abdullah University of Science and Technology, Al Jazri Building West, Thuwal 23955-6900, Saudi ArabiaThe use of unmanned aerial vehicles (UAVs) for Earth and environmental sensing has increased significantly in recent years. This is particularly true for multi- and hyperspectral sensing, with a variety of both push-broom and snap-shot systems becoming available. However, information on their radiometric performance and stability over time is often lacking. The authors propose the use of a general protocol for sensor evaluation to characterize the data retrieval and radiometric performance of push-broom hyperspectral cameras, and illustrate the workflow with the Nano-Hyperspec (Headwall Photonics, Boston USA) sensor. The objectives of this analysis were to: (1) assess dark current and white reference consistency, both temporally and spatially; (2) evaluate spectral fidelity; and (3) determine the relationship between sensor-recorded radiance and spectroradiometer-derived reflectance. Both the laboratory-based dark current and white reference evaluations showed an insignificant increase over time (<2%) across spatial pixels and spectral bands for >99.5% of pixel–waveband combinations. Using a mercury/argon (Hg/Ar) lamp, the hyperspectral wavelength bands exhibited a slight shift of 1-3 nm against 29 Hg/Ar wavelength emission lines. The relationship between the Nano-Hyperspec radiance values and spectroradiometer-derived reflectance was found to be highly linear for all spectral bands. The developed protocol for assessing UAV-based radiometric performance of hyperspectral push-broom sensors showed that the Nano-Hyperspec data were both time-stable and spectrally sound.https://www.mdpi.com/1424-8220/19/21/4699hyperspectralradiometricuavremote sensingheadwall nano-hyperspecspectroradiometer |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. Alejandra P. Barreto Kasper Johansen Yoseline Angel Matthew F. McCabe |
spellingShingle |
M. Alejandra P. Barreto Kasper Johansen Yoseline Angel Matthew F. McCabe Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral Camera Sensors hyperspectral radiometric uav remote sensing headwall nano-hyperspec spectroradiometer |
author_facet |
M. Alejandra P. Barreto Kasper Johansen Yoseline Angel Matthew F. McCabe |
author_sort |
M. Alejandra P. Barreto |
title |
Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral Camera |
title_short |
Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral Camera |
title_full |
Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral Camera |
title_fullStr |
Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral Camera |
title_full_unstemmed |
Radiometric Assessment of a UAV-Based Push-Broom Hyperspectral Camera |
title_sort |
radiometric assessment of a uav-based push-broom hyperspectral camera |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2019-10-01 |
description |
The use of unmanned aerial vehicles (UAVs) for Earth and environmental sensing has increased significantly in recent years. This is particularly true for multi- and hyperspectral sensing, with a variety of both push-broom and snap-shot systems becoming available. However, information on their radiometric performance and stability over time is often lacking. The authors propose the use of a general protocol for sensor evaluation to characterize the data retrieval and radiometric performance of push-broom hyperspectral cameras, and illustrate the workflow with the Nano-Hyperspec (Headwall Photonics, Boston USA) sensor. The objectives of this analysis were to: (1) assess dark current and white reference consistency, both temporally and spatially; (2) evaluate spectral fidelity; and (3) determine the relationship between sensor-recorded radiance and spectroradiometer-derived reflectance. Both the laboratory-based dark current and white reference evaluations showed an insignificant increase over time (<2%) across spatial pixels and spectral bands for >99.5% of pixel–waveband combinations. Using a mercury/argon (Hg/Ar) lamp, the hyperspectral wavelength bands exhibited a slight shift of 1-3 nm against 29 Hg/Ar wavelength emission lines. The relationship between the Nano-Hyperspec radiance values and spectroradiometer-derived reflectance was found to be highly linear for all spectral bands. The developed protocol for assessing UAV-based radiometric performance of hyperspectral push-broom sensors showed that the Nano-Hyperspec data were both time-stable and spectrally sound. |
topic |
hyperspectral radiometric uav remote sensing headwall nano-hyperspec spectroradiometer |
url |
https://www.mdpi.com/1424-8220/19/21/4699 |
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