. Abstract: New Zealand and Chile being among the well-known “New World” wine producing countries, arguably have much in common as far as viticulture and wine production are concerned especially, in terms of rapid progress achieved in grapevine cultivation and wine produced over the last few years. The two countries are in the same hemisphere, and temperature latitudes but situated on either side of the prime meridian. In this context, the paper looks at some of the specific viticulture related aspects in different modalities, such as vector (point, contour), raster and text formats and then investigates into analysing the multimodal data collectively at a regional scale which is considered as appropriate for such a comparative study in this specific domain. The commonly used major themes for modelling viticulture and wine production until to date have been; growing degree days (GDD), minimum/ maximum temperatures during berry ripening, frost days at budburst for the wine regions within a country or in the world, and are briefly outlined. Meanwhile, at a relatively recent meso / micro scale (precision viticulture) modelling using grapevine vegetative growth and grape yield requires expensive equipment for multispectral satellite/ aerial borne imagery and yield data acquisition. Following a brief outline on the use of contemporary technologies, such as GPS, and methodologies to analyse information integrated into GIS, the paper then elaborates on the results of a comparative study conducted on seven major wine regions of New Zealand and Chile using GIS based thematic mappings of terrain, topography, climatic conditions, grapevine varieties as well as wine quality, the latter represented by regional vintage ratings, sommelier comments and wine label ratings. The results of one-way ANOVA tests show the difference across viticulture climate regimes of the seven regions as significant (95% confident). However, between countries the difference is significant only for dew point in November and December, sea level pleasure in December, and total precipitation in December. Keywords: viticulture, wine quality
Major lines of Latitude
Tropic of Capricorn Tropic of Cancer Equator Prime Meridian
Colchagua Maipo Santiago
Hawke's Bay Martinborough Martinborough Central Otago
Figure 1. Chilean and NZ wine regions and viticulture climate regimes (base climate) source: http://www.weatherbase.com (T=Temperature)
Shanmuganathan et al., Analysing the Wine Regions of New Zealand and Chile: a GIS perspective
New Zealand and Chile are among the well-known “New World” wine producing countries. Incidentally, the major wine regions of the two nations are also in the same hemisphere, and temperature latitudes but on the opposite sides of the prime meridian. The rapid progress achieved in producing premium wine from these regions over the last few years have been described as remarkable hence a comparative study of this nature especially, on grapevine varieties cultivated and wine styles produced from the regions of the two countries would be appropriate. It is also considered as a timely one because the wine regions of both old and new world countries are seen as highly vulnerable to the predicted global climate change in the near future (Jones, 2007, Web, 2006). In this context, the paper looks at some of the specific viticulture related aspects in different modalities, such as vector (point, contour), raster and text formats and then investigates into analysing the multimodal data collectively at a regional scale which is considered as appropriate for such a comparative study and for analysing the effects of climate on viticulture and wine production. The paper presents an overview of 1) the base climate and the 2) a...