## 4 Introduction to the Visualization Tool Based on Graphical Information Systems
### Enhancing Grape Quality Assessment Through Web Mapping
#### 4.1.3 SICPAC Data  
The geographical data furnished by the GIS will be conveyed through the Vectorial system. The SIGPAC data can be freely downloaded for the whole region in vector format [11]. This framework portrays geographical attributes as vectors, ensuring that the depicted geography closely aligns with reality. It accurately captures the topological relationships among the described elements, as illustrated in Figure 10. The Vectorial model offers several benefits, such as its data occupying minimal storage space, seamless integration with CAD systems, and exceptional precision. The vector layer used in the map viewer contains the graphic information of the SIGPAC enclosures. Each enclosure is a polygon and has several attributes associated with it, with the main ones being its identifier or reference (province-municipality-aggregate-zone-polygon-parcel-precinct). This attribute is fundamental to be able to make the relationship between the vineyard register and the land register. In this study, SIGPAC-only agricultural crop data were considered as a reference and validation of our proposed classification approaches. These data are produced based on the SIGPAC geographical boundaries and the annual declaration of agricultural exploitation. Figure 11 illustrates the maps of vineyard and non-vineyard fields at the two study sites using training datasets from both sites. The case of the Villarrubia de los Ojos region (Castilla-La Mancha, Spain) illustrates a clear concentration of vineyard plots in approximately the same area. Regarding the technological framework and tools for geospatial mapping, it should be remarked that to generate and visualize maps related to grape quality, geospatial data compliant with the INSPIRE directive (Infrastructure for Spatial Information in Europe) were used. This directive establishes European standards to ensure the interoperability and accessibility of spatial information across the EU. Specifically, the ATOM service provided by the Spanish Ministry of Agriculture, Fisheries, and Food was employed through the Fondo Espanol de Garantia Aggraria (FEGA) portal [12]. This service enables access to data in formats compatible with Geographic Information Systems (GISs), such as GeoJSON and shapefiles, facilitating their integration and analysis using tools like QGIS and other geospatial frameworks. Figure 10: Represents the cadastral delimitation and the enclosure provided by the SIGPAC. The red line indicates the cadastral graphic delimitation, which coincides with the boundaries of the cadastral parcel. The purple line outlines each enclosure within the parcel, with associated alphanumeric information, such as codes and attributes, displayed alongside. The downloaded datasets were initially provided in the ETRS89 coordinate reference system, which is commonly used for spatial analysis in Europe due to its high precision for regional applications. To ensure compatibility with web-based mapping tools, the data were reprojected to WGS84 (EPSG:4326), which is the standard coordinate system for web visualization. This reprojection was essential for seamless integration with Leaflet [13], a lightweight and widely used JavaScript library for creating interactive maps in web applications. The front-end development of the web application was implemented using Angular, a TypeScript-based framework that provides modular architecture and reactive programming capabilities. Leaflet was integrated within the Angular application using open-source plug-ins, enabling dynamic rendering of geospatial data directly in the browser. Custom map layers, markers, and popups were added to visualize grape quality metrics interactively, facilitating user exploration of spatial patterns. Data handling and visualization workflows were optimized through RESTful APIs that connected the front end with a server-side processing pipeline.