Final answer:
A Triangular Irregular Network (TIN) is a vector-based model used to represent a continuous surface in a three-dimensional space.
Step-by-step explanation:
A Triangular Irregular Network (TIN) is not a raster-based 3DGIS model. Rather, it is a vector-based model used to represent a continuous surface, such as elevation data, in a three-dimensional space. TINs are composed of non-overlapping triangles that connect a set of irregularly distributed points with known elevation values.