A Comparison of UAV and Satellites Multispectral Imagery in Monitoring Onion Crop. An Application in the ‘Cipolla Rossa di Tropea’ (Italy)
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Site
2.2. Platforms and Data Acquisition
2.2.1. UAV Images
2.2.2. Satellite Images
2.3. Comparison of Vegetation Indices (VIs) from the Three Platforms
2.4. Image Segmentation and Classification
3. Results and Discussions
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
References
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Platform | UAV | SATELLITE | |
---|---|---|---|
Parrot Disco-Pro AG | PlanetScope | Sentinel-2 | |
| Camera Parrot Sequoia | 3U Cubesat | |
Number of channels used | 4 | 4 | 4 |
Spectral wavebands (nm) | Green 550 (width 40) Red 660 (width 40) Red Edge 690 (width 10) NIR 790 (width 40) | Blue 464–517 (width 26.5) Green 547–585 (width 19) Red 650–682 (width 16) NIR 846–888 (width 21) | Blue 426–558 (width 66) Green 523–595 (width 36) Red 633–695 (width 31) NIR 726–938 (width 106) |
Radiometric resolution | 10 bit | 16 bit | 16 bit |
Dimension | 59 mm × 41 mm × 28 mm | 100 mm × 100 mm × 300 mm | 3.4 × 1.8 × 2.35 m |
Weight | 72 g | 4 kg | 1000 kg |
FOV | HFOV: 62° VFOV: 49° | HFOV: 24.6 km VFOV: 16.4 km | HFOV: 290 km |
Flight quote AGL | 50 m | 475 km | 786 km |
Ground resolution distance (GSD) | 5 cm | 3.7 m | 10 m |
Number of images to cover the study site | >1000 | 1 | 1 |
Date | Platform | Number of Pixels | SAVI Mean | SAVI Standard Deviation | SAVI CV (%) |
---|---|---|---|---|---|
November 2018 | UAV | 28,132,559 | 0.112 | 0.07 | 62.5 |
PlanetScope | 8118 | 0.276 | 0.09 | 32.6 | |
Sentinel-2 | 696 | 0.360 | 0.12 | 33.3 | |
December 2018 | UAV | 28,132,559 | 0.142 | 0.10 | 70.4 |
PlanetScope | 8118 | 0.536 | 0.13 | 24.2 | |
Sentinel-2 | 696 | 0.420 | 0.15 | 35.7 | |
January 2019 | UAV | 28,132,559 | 0.199 | 0.11 | 55.2 |
PlanetScope | 8118 | 0.484 | 0.14 | 28.9 | |
Sentinel-2 | 696 | 0.590 | 0.16 | 27.1 |
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Messina, G.; Peña, J.M.; Vizzari, M.; Modica, G. A Comparison of UAV and Satellites Multispectral Imagery in Monitoring Onion Crop. An Application in the ‘Cipolla Rossa di Tropea’ (Italy). Remote Sens. 2020, 12, 3424. https://doi.org/10.3390/rs12203424
Messina G, Peña JM, Vizzari M, Modica G. A Comparison of UAV and Satellites Multispectral Imagery in Monitoring Onion Crop. An Application in the ‘Cipolla Rossa di Tropea’ (Italy). Remote Sensing. 2020; 12(20):3424. https://doi.org/10.3390/rs12203424
Chicago/Turabian StyleMessina, Gaetano, Jose M. Peña, Marco Vizzari, and Giuseppe Modica. 2020. "A Comparison of UAV and Satellites Multispectral Imagery in Monitoring Onion Crop. An Application in the ‘Cipolla Rossa di Tropea’ (Italy)" Remote Sensing 12, no. 20: 3424. https://doi.org/10.3390/rs12203424