Which of the following is NOT a way to represent elevation data?

The choice indicating that point clouds are not a way to represent elevation data is not accurate. Point clouds are actually a valid and commonly used method for representing elevation data. They consist of a set of data points in space, usually created using 3D scanning technologies such as LiDAR. Each point in the cloud has its own coordinates (X, Y, and Z), which can be used to represent the surface of the terrain or an object in three-dimensional space, thus effectively capturing elevation information.

Raster representations use a grid format where each cell (or pixel) has a value representing elevation, making it a straightforward way to depict continuous surfaces. TIN is another recognized approach to represent elevation, where data points are used to create a network of triangles that can model complex terrains.

On the other hand, while a profile can provide a cross-sectional representation of elevation by showing elevation changes along a specific line, it is not a standalone method of representing elevation data in the same sense as point clouds, raster, or TIN models. It is more a derived product from those main forms of representations rather than a primary method itself.