What is the most important reason to use GIS data?

• A. It stores large datasets
• B. It enables 3D visualization
• C. It provides the ability to overlay multiple types of information for risk and/or resource determinations
• D. It replaces fieldwork

Answer: (C)

The most important reason to use GIS data is its ability to overlay diverse data layers to support risk assessment and resource decisions. By bringing together geology, faults, soils, hydrology, topography, land use, demographics, and infrastructure in one map, you can see how these factors relate spatially and identify where hazards, resources, and opportunities intersect. This layered view makes it possible to perform analyses that inform where to focus mitigation, how to plan development, or where resource exploration is most feasible. While storing large datasets and 3D visualization are useful features, and fieldwork remains essential for accurate data, the core value of GIS is combining and analyzing multiple information types to make informed decisions about risk and resources.