Development of a Spatial Decision Support System (Sdss) for Grape Cultivation by Using a Geographical Information System (Gis): Çatak (Turkey) Example

Abstract

This study aims to develop a spatial decision support system (SDSS) by evaluating climate, soil, and topography factors together with the help of a Geographical Information System (GIS) and by using this modelled SDSS to determine the potentially suitable areas where grape varieties with different ripening levels within the study area (& Ccedil;atak, Turkey) can be grown. The study was carried out in the & Ccedil;atak district, located in the south of Lake Van, between 4080000 and 4240000 north latitudes and 300000 and 370000 east longitudes (UTM WGS84) in eastern Turkey in 2021-2022. In the study, some important individual factors for vine growing such as the effect of heat summation (EHS), number of frost-free days, minimum winter temperature, aspect, slope, soil depth, and land use capability were evaluated using the GIS and weighted notation ratio result method, and based on this, a suitability analysis was carried out. It was determined that the distributions of the study area for first, second, and third suitability levels, respectively, were 0.72-26.05-52.50% for the earliest variety, 4.58-33.84-48.28% for the early variety, 1.15-22.56-58.47% for the mid-early varieties, 3.95-20.52-49.07% for the mid-season varieties, and 1.18-13.20-44.61% for the late variety. It was seen that the variables and the modelling used were effective in determining suitable areas for grape cultivation.