An efficient RGB-UAV-based platform for field almond tree phenotyping: 3-D architecture and flowering traits
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nt Methods Open Access
RESEARCH
An efficient RGB‑UAV‑based platform for field almond tree phenotyping: 3‑D architecture and flowering traits Francisca López‑Granados1, Jorge Torres‑Sánchez1, Francisco M. Jiménez‑Brenes1, Octavio Arquero2, María Lovera2 and Ana I. de Castro1*
Abstract Background: Almond is an emerging crop due to the health benefits of almond consumption including nutritional, anti-inflammatory, and hypocholesterolaemia properties. Traditional almond producers were concentrated in Califor‑ nia, Australia, and Mediterranean countries. However, almond is currently present in more than 50 countries due to breeding programs have modernized almond orchards by developing new varieties with improved traits related to late flowering (to reduce the risk of damage caused by late frosts) and tree architecture. Almond tree architecture and flowering are acquired and evaluated through intensive field labour for breeders. Flowering detection has traditionally been a very challenging objective. To our knowledge, there is no published information about monitoring of the tree flowering dynamics of a crop at the field scale by using color information from photogrammetric 3D point clouds and OBIA. As an alternative, a procedure based on the generation of colored photogrammetric point clouds using a low cost (RGB) camera on-board an unmanned aerial vehicle (UAV), and an semi-automatic object based image analysis (OBIA) algorithm was created for monitoring the flower density and flowering period of every almond tree in the framework of two almond phenotypic trials with different planting dates. Results: Our method was useful for detecting the phenotypic variability of every almond variety by mapping and quantifying every tree height and volume as well as the flowering dynamics and flower density. There was a high level of agreement among the tree height, flower density, and blooming calendar derived from our procedure on both fields with the ones created from on-ground measured data. Some of the almond varieties showed a significant linear fit between its crown volume and their yield. Conclusions: Our findings could help breeders and researchers to reduce the gap between phenomics and genom‑ ics by generating accurate almond tree information in an efficient, non-destructive, and inexpensive way. The method described is also useful for data mining to select the most promising accessions, making it possible to assess specific multi-criteria ranking varieties, which are one of the main tools for breeders. Keywords: Low-cost camera, Volume and 3D mapping, Colored point clouds, Object-based image analysis (OBIA), Remote sensing, Woody crop
*Correspondence: [email protected] 1 Institute for Sustainable Agriculture IAS-CSIC, 14004 Córdoba, Spain Full list of author information is available at the end of the article © The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or for
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