GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 Investigating three proximal remote sensing techniques for vineyard yield monitoring

Investigating three proximal remote sensing techniques for vineyard yield monitoring

Abstract

Context and purpose of the study – Yield monitoring can provide the winegrowers with information for precise production inputs during the season, thereby, ensuring the best possible harvest. Yield estimation is currently achieved through an intensive process that is destructive and time-consuming. However, remote sensing provides a group of proximal technologies and techniques for a non-destructive and less time-consuming method for yield monitoring.The objective of this study was to analyse three different approaches, for measuring grapevine yield close to harvest. Traditional destructive measurements for yield determination were used as a reference. Each technique was tested in controlled conditions (laboratory) and field conditions (vineyard) at bunch and vine levels.

Material and methods – This study was carried out in a drip-irrigated vineyard cv. Shiraz at the Welgevallen farm (Stellenbosch University, South Africa). The Shiraz block was planted with a North-South orientation in the year 2000 (2.7m x 1.5m spacing). The vines are spur pruned on a seven-wire vertical shoot positioned system (VSP). Three proximal remote sensing techniques: a) RGB imagery (Conventional Red-Green-Blue images), b) infrared depth sensing (Kinect sensor), and c) light detection and ranging (LiDAR) were analysed for yield monitoring. The estimated yield was accomplished using bunch volume estimation in three experiments at harvest. Experiment 1 uses the Kinect and RGB imagery to estimate bunch volume based on a sample of 94 individual bunches under laboratory conditions. Experiment 2 uses Kinect and RGB imagery to estimate the volume of 21 individual bunches in-field. Experiment 3 uses Kinect, RBG imagery, and LiDAR, in-field, to estimate total yield per vine of 31 individual vines. Experiment 2 and Experiment 3 were undertaken using two canopy treatments: i) full canopy (FC), and ii) leaf removal (LR – 100% leaf removal in the bunch zone thereby exposing the bunches).

Results – The results obtained in this study show a strong correlation between the volume calculated by RGB images (2D modelling) and Kinect (3D modelling) versus the control volume of the individual bunches (Experiment 1). Experiments 2 and 3 show promising results for the three proximal remote sensing techniques studied, especially in the case of fully exposed bunches (LR treatment). Therefore, it’s possible to state the feasibility of these techniques as alternative fast and non-destructive methods for yield monitoring.

Download the PDF

DOI:

Publication date: September 28, 2023

Issue: GiESCO 2019

Type: Poster

Authors

Chris HACKING1, Nitesh POONA1, Nicola MANZAN2, Carlos POBLETE-ECHEVERRÍA3*

1 Department of Geography and Environmental Studies, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
2 Dipartimento di Scienze AgroAlimentari, Ambientali e Animali, University of Udine, Via delle Scienze 208, Udine, Italy
3 Department of Viticulture and Oenology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa

Contact the author

Keywords

grapevine, yield monitoring, non-destructive methods, light detection and ranging (LiDAR), infrared depth sensing, conventional Red Green Blue images

Tags

GiESCO | GiESCO 2019 | IVES Conference Series

Citation

Related articles…

Underpinning terroir with data: rethinking the zoning paradigm

Agriculture, natural resource management and the production and sale of products such as wine are increasingly data-driven activities. Thus, the use of remote and proximal crop and soil sensors to aid management decisions is becoming commonplace and ‘Agtech’ is proliferating commercially; mapping, underpinned by geographical information systems and complex methods of spatial analysis, is widely used. Likewise, the chemical and sensory analysis of wines draws on multivariate statistics; the efficient winery intake of grapes, subsequent production of wines and their delivery to markets relies on logistics; whilst the sales and marketing of wines is increasingly driven by artificial intelligence linked to the recorded purchasing behaviour of consumers. In brief, there is data everywhere! Opinions will vary on whether these developments are a good thing. Those concerned with the ‘mystique’ of wine, or the historical aspects of terroir and its preservation, may find them confronting. In contrast, they offer an opportunity to those interested in the biophysical elements of terroir, and efforts aimed at better understanding how these impact on vineyard performance and the sensory attributes of resultant wines. At the previous Terroir Congress, we demonstrated the potential of analytical methods used at the within-vineyard scale in the development of Precision Viticulture, in contributing to a quantitative understanding of regional terroir. For this conference, we take this approach forward with examples from contrasting locations in both the northern and southern hemispheres. We show how, by focussing on the vineyards within winegrowing regions, as opposed to all of the land within those regions, we might move towards a more robust terroir zoning than one derived from a mixture of history, thematic mapping, heuristics and the whims of marketers. Aside from providing improved understanding by underpinning terroir with data, such methods should also promote improved management of the entire wine value chain.
Read More

Publication of the 3rd edition of the OIV ampelographic descriptors

Ampelography is aimed at describing the vine according to several characteristics, such as morphology, agronomic aptitudes, technological potential, and genetics. The description of varieties and species of vitis has long been the subject of numerous scientific and technical studies by eminent specialists for a long time, which have led the OIV to publish in 1983 the “descriptor list for grape varieties and vitis species”, a milestone among the OIV worldwide recognised codes.

Read More

La pianificazione del paesaggio agrario vitivinicolo del basso Monferrato

Monferrato is a sub region of Piedmont featuring an endless series of hills which have been moulded through the centuries by laborious farming. Vineyards have always been the protagonists of Monferrato landscape. Asti vineyards have been well-known since Roman times and Pliny the Elder mentions them.

Read More

Can wine competition awarded points be correlated with wine chromatic and aromatic composition?

The quality of wine is difficult to define. This is most certainly accredited to everyone´s different perception of quality. Some of the indicators of high-quality wines are complexity, balance, color and intensity. Color is one of the most crucial attributes of quality, not only for the obvious implications for their perception but also because they are indicators of other aspects related to its aroma and taste. Phenolic compounds are the main responsible for wine color, being anthocyanin and tannins the most determinant compounds in red wines. In addition to color, wine aroma is another important attribute linked with quality and consumer preferences.

Read More

FUNGAL DIVERSITY AND DYNAMICS IN CHAMPAGNE VINEYARDS: FROM VINE TO WINE

Champagne is a well-known wine region in Northern France with distinct terroirs and three main grape varieties. As for any vineyard, wine quality is highly linked to the microbiological characteristics of the raw materials. However, Champagne grape microbiota, especially its fungal component, has yet to be fully characterized. Our study focused on describing this mycobiota, from vine to small scale model wine, for the two main Champagne grape varieties, Pinot Noir and Meunier, using complementary cultural and omics approaches.

Read More