研究目的
To study the radiometric performance of an operational multispectral camera Sequoia? manufactured by Parrot, within a routinely field monitoring work, in order to set the best working range and the quality of the data provided at reflectance and vegetation index levels.
研究成果
The multispectral camera shows linear behavior in the green and red channels up to 0.45 reflectance, with saturation beyond. The red edge and NIR channels are linear across the full range. NDVI shows good agreement with field data, but caution is needed with high reflectance surfaces due to potential saturation effects.
研究不足
Saturation effects in the green and red visible bands at reflectance values over 0.45, and worse linear fit in the red edge band due to its narrow bandwidth and higher sensitivity to spectral and spatial variations.
1：Experimental Design and Method Selection:
The study involved calibrating a Sequoia? camera in terms of reflectance and NDVI using a wheat cover field work.
2：Sample Selection and Data Sources:
Field measurements were conducted in 'Las Tiesas' experimental farm, Spain, using an ASD FieldSpec 3 Hi-Res ? spectroradiometer and a multispectral camera onboard a UAV.
3：List of Experimental Equipment and Materials:
Sequoia? multispectral camera, ASD FieldSpec 3 Hi-Res ? spectroradiometer, calibration surfaces.
4：Experimental Procedures and Operational Workflow:
Reflectance measurements were taken over different surfaces and vegetation, concurrent with UAV flights.
5：Data Analysis Methods:
The reflectance values from the camera were compared with field measurements, and NDVI was calculated for comparison.
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