Assessing the Orange Tree Crown Volumes Using Google Maps as a Low-Cost Photogrammetric Alternative
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Marín Buzón, Carmen; Pérez Romero, Antonio Miguel; Tucci Álvarez, Fabio; Manzano Agugliaro, Francisco RogelioDate
2020-06-23Abstract
The accurate assessment of tree crowns is important for agriculture, for example, to adjust spraying rates, to adjust irrigation rates or even to estimate biomass. Among the available methodologies, there are the traditional methods that estimate with a three-dimensional approximation figure, the HDS (High Definition Survey), or TLS (Terrestrial Laser Scanning) based on LiDAR technology, the aerial photogrammetry that has re-emerged with unmanned aerial vehicles (UAVs), as they are considered low cost. There are situations where either the cost or location does not allow for modern methods and prices such as HDS or the use of UAVs. This study proposes, as an alternative methodology, the evaluation of images extracted from Google Maps (GM) for the calculation of tree crown volume. For this purpose, measurements were taken on orange trees in the south of Spain using the four methods mentioned above to evaluate the suitability, accuracy, and limitations of GM. Using the HDS method as a re...
Palabra/s clave
Google maps
photogrammetry
HDS
TLS
LiDAR
tree crown
UAV
orange tree