Final answer:
The term that describes the spatial location of an actual or planned structure is Site. This term is central to fields such as geography, architecture, and urban planning, and it often involves the use of GIS software for analysis.
Step-by-step explanation:
The term used to describe the spatial location of an actual or planned structure or set of structures is D) Site. 'Site location analysis' is a critical part of geography, where geographers use a variety of data to determine the best locations for businesses, public services, and other structures. This process often involves the use of Geographic Information System (GIS) software for the analysis of factors like traffic patterns, real estate costs, zoning laws, and demographic information. Understanding the significance of site is essential for several fields, including architecture, urban planning, and environmental studies. For instance, in the context of architecture, the site is fundamentally connected to the creation of buildings, influencing not just their physical placement but also potentially informing their design and function.