Georeferenced Scanning System to Estimate the Leaf Wall Area in Tree Crops

Moral Martínez, Ignacio del; Rosell Polo, Joan Ramon; Arnó Satorra, Jaume; Escolà i Agustí, Alexandre; Sanz Cortiella, Ricardo; Masip Vilalta, Joan; Company Mesa, Joaquim

doi:https://doi.org/10.3390/s150408382

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Issue date

2015

Author

Moral Martínez, Ignacio del

Rosell Polo, Joan Ramon

Arnó Satorra, Jaume

Escolà i Agustí, Alexandre

Sanz Cortiella, Ricardo

Masip Vilalta, Joan

Company Mesa, Joaquim

Suggested citation

Moral Martínez, Ignacio del; Rosell Polo, Joan Ramon; Arnó Satorra, Jaume; Escolà i Agustí, Alexandre; Sanz Cortiella, Ricardo; Masip Vilalta, Joan; Company Mesa, Joaquim; . (2015) . Georeferenced Scanning System to Estimate the Leaf Wall Area in Tree Crops. Sensors, 2015, vol.15, núm. 4, p. 8382-8405. https://doi.org/10.3390/s150408382.

Abstract

This paper presents the use of a terrestrial light detection and ranging (LiDAR) system to scan the vegetation of tree crops to estimate the so-called pixelated leaf wall area (PLWA). Scanning rows laterally and considering only the half-canopy vegetation to the line of the trunks, PLWA refers to the

vertical projected area without gaps detected by LiDAR. As defined, PLWA may be different depending on the side from which the LiDAR is applied. The system is completed by a real-time kinematic global positioning system (RTK-GPS) sensor and an inertial measurement unit (IMU) sensor for positioning. At the end, a total leaf wall area (LWA) is computed and assigned to the X, Y position of each vertical scan. The final value of the area depends on the distance between two consecutive scans (or horizontal resolution), as well as the number of intercepted points within each scan, since PLWA is only computed when the laser beam detects vegetation. To verify system performance, tests were conducted related to the georeferencing task and synchronization problems between GPS time and central processing unit (CPU) time. Despite this, the overall accuracy of the system is generally acceptable. The Leaf Area Index (LAI) can then be estimated using PLWA as an explanatory variable in appropriate linear regression models.

URI

http://hdl.handle.net/10459.1/48953

DOI

https://doi.org/10.3390/s150408382

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Sensors, 2015, vol.15, núm. 4, p. 8382-8405

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Except where otherwise noted, this item's license is described as cc-by (c) Moral Martínez, Ignacio del et al; 2015