Terroir 2008 banner
IVES 9 IVES Conference Series 9 On the stability of spectral features of four vine varieties in Brazil, Chile and France

On the stability of spectral features of four vine varieties in Brazil, Chile and France

Abstract

Satellite images of vineyards in France, Chile, and Brazil are used to study spectral differences between the vine varieties Cabernet Sauvignon, Merlot, Pinot Noir, and Chardonnay, to verify if features of a given variety are conserved at vineyards in completely different terroirs. Data are eight images from ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) orbital sensor, for years 2000, 2001, 2002, 2004, and 2006. Additional information is from maps of properties, field surveys and GPS measurements. In France, data is from the Champagne region (Pinot Noir and Chardonnay), and Bordeaux (Cabernet Sauvignon and Merlot); images of Chile are of Aconcagua Valley (Cabernet Sauvignon, Merlot); in Brazil, data for all varieties are from the Serra do Sudeste region. All spectra are expressed in reflectance values, across the nine spectral bands of VNIR (Visible and Near Infrared) and SWIR (Shot Wave Infrared), which are ASTER detection subsystems. Corrections for atmospheric absorption are applied. It is assumed that vine leaves are the dominant source of radiance. Spectra and NDVI for each variety, for every terroir, are generated. Results are: a) spectra of Cabernet Sauvignon and Merlot are similar to each other, over all regions; b) Pinot Noir and Chardonnay also have similar, characteristic spectra; c) spectra from later stages in the phenological cycle tend to have smaller reflectances; d) for each variety, the characteristic spectra has a stable configuration, even when measured in different terroirs and at different epochs; e) NDVI values confirm the two-by-two grouping of varieties. It is concluded that, despite large differences in terroir, spectral features of each one of the studied varieties are conserved.

Download the PDF

DOI:

Publication date: December 8, 2021

Issue: Terroir 2008

Type : Article

Authors

Gisele CEMIN, Jorge Ricardo DUCATI

Centro Estadual de Pesquisas em Sensoriamento Remoto e Meteorologia
Universidade Federal do Rio Grande do Sul
Av. Bento Gonçalves 9500 – CEP 91501-970
Porto Alegre, Brazil

Contact the author

Keywords

remote sensing, spectral signatures, satellite images, terroirs

Tags

IVES Conference Series | Terroir 2008

Citation

Related articles…

BORDEAUX RED WINES WITHOUT ADDED SULFITES SPECIFICITIES: COMPOSITIONAL AND SENSORY APPROACHES TOWARDS HIGHLIGHTING AND EXPLAI-NING THEIR SPECIFIC FRUITINESS AND COOLNESS

With the development of naturality expectations, wines produced without any addition of sulfur dioxide (SO₂) become very popular for consumers and such wines are increasingly present on the market. Recent studies also showed that Bordeaux red wines without added SO₂ could be differentiated from a sensory point of view from similar wines produced with SO₂¹. Thus, the aim of the current study was to characterize from a sensory point of view, specific aromas of wines without added SO₂ and to identify compounds involved.

Read More

Innovative approaches in the evaluation of the spatial and temporal biodiversity of grape varieties from the Portuguese Bairrada appellation using LIMM-PCA: a study across five harvests

Sustainable viticulture and winemaking continue to represent huge challenges, where a better knowledge about the functional role of biodiversity in the vineyard and wine ecosystems is required, as well as the varieties plasticity. Particular attention should be devoted to the spatial and temporal interactions between authorized or recommended varieties for a specific demarcated region and clime and vineyard conditions (such as soil type, orientation of the lines, age of the vine, density of planting, harvesting practices, among others).

Read More

Exploring the plasticity of the grapevine drought physiology

Grapevine response to water deficit has been extensively studied. Nevertheless, debate still exists regarding some physiology adoption under drought

Read More

From bush to glass: unlocking the potential of indigenous microbes in Australian wines

Global trends in the wine industry are changing, which is caused by consumer demands for aroma and flavour innovation. Producers in Australia, the sixth globally ranked wine producing country, are embracing this trend by exploring non-conventional yeast species to improve sensory qualities and achieve fermentation advantages.

Read More

Postharvest ozone treatment in grapevine white cultivars: Effects on grape volatile composition

During postharvest management, the metabolism of fruits remains active and continuous physico-chemical changes occur. Ozone treatment has an elicitor effect on secondary metabolites and the treatment conditions can influence the grape response to the stress (Bellincontro et al., 2017; Botondi et al., 2015). Regarding volatile organic compounds (VOCs), previous studies showed that ozone treatment during postharvest dehydration induces the biosynthesis of terpenes in Moscato bianco grapes (Río Segade et al., 2017). It is well known that grape VOCs greatly influence the organoleptic properties of wines, particularly terpenes in aromatic varieties.

Read More