What type of visualization refers to the flat representation of spatial data?

The correct response, which is 2D Visualization, refers to the display of spatial data in a manner that represents geographic features on a flat plane. This type of visualization captures two dimensions: width and height, allowing for the representation of locations and relationships among spatial elements without any representation of depth. It is foundational in GIS applications, as most maps and spatial analyses are inherently two-dimensional, whether they depict simple point data, lines, or polygons representing various features on the Earth’s surface.

The other options, although related to the general concept of visualization or mapping, do not specifically capture the essence of a flat representation of spatial data in the same direct way. Graphical Representation could encompass a wide range of forms that go beyond several dimensions, often including visual elements that are not strictly tied to a flat display of spatial data. Linear Mapping typically refers to specific approaches used to represent linear features such as roads or rivers, while Two-Dimensional Mapping is synonymous but less commonly used than 2D Visualization in the context of terminology in GIS. Therefore, 2D Visualization is the most accurate term to describe the flat representation of spatial data.