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…

Molecular approaches for understanding and modulating wine taste

Wine consumers generally demand wines having a perception of softer tannins and less ripe, having a heaviness and richness on palate (full-body wine) with a limpid and stable color. However, polyphenol
(tannins)-rich wines have been also correlated with unpleasant taste properties such as astringency and
bitterness when perceived at high intensities. Modulating these unpleasant properties could be important for consumer’s approval of wines.

Read More

The role of soil water holding capacity and plant water relations in zone/terroir expression

The spatial variability in soil type and depth and water holding capacity is very high in many viticultural regions of the world. Differences in rooting depths and water extraction profiles and their seasonal dynamics add additional variability and it is extremely difficult to deduct direct causal relationships between these factors and fruit

Read More

Does the sustainability perception depend on the Terroir?

The main scope of this research has been to investigate what values are attributed to the concept of “sustainability” by the wine producers of two different wine territories of Piedmont; the terroir of the Barolo DOCG and the the terroir of the Gavi DOCG. The research wants to emphasize how much the characteristic elements of each terroir influence the perception of the concept of sustainability among producers.

Read More

Selecting varieties best adapted to current and future climate conditions based on ripening traits

Aim: The aim of this study was to quantify key berry sugar accumulation traits and characterize their plasticity in response to climate variation from data collected from different cultivars over seven years from an experimental vineyard.

Read More

Ugni blanc berry and wine composition impacted by thirteen rootstocks

The Cognac region is expanding, driven by the success of its renowned brandy and the demand for high grape yields to ensure a steady supply of base wine for distillation. Ugni blanc, the most widely planted grape variety, relies on rootstocks for soil and climate adaptation, providing essential nutrient supplies to the scion. Understanding the impact of rootstocks on key berry components, such as sugars and nitrogen compounds, is crucial. These compounds serve as primary precursors for the production of fermentative aroma metabolites, which, in turn, act as quality indicators for eau-de-vie.

Read More