In this lab, I explored different applications to TIN datasets. I draped an image over a surface, used a DEM to make a suitability map, explored TIN symbology, and analyzed and modified TINs. A TIN is a Triangulated Irregular Network. It is a vector version of a 3D surface, representing the surface as linked triangles. In comparison, a DEM is a raster with a regular grid representing elevation in a cell. A DEM's cell size (aka resolution) significantly affects analysis.
Below is an example from the lab that demonstrates the difference between TIN and DEM data. The red and black contours are derived from the TIN. The blue contours are derived directly from elevation points. The key difference between the two contours is the smoothness of the lines. The smoothness of the lines can be explained by the source of the contours. As I mentioned above, TINs are made up of a triangular network this makes the contours derived from the TIN more angular than contours derived from points.
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