Special Topics TINs & DEMs Lab 4

 This weeks lab focused on triangular irregular networks (TIN) and digital elevation models (DEM). TIN are a form of vector based data and constructed by triangulating a set of points. TIN models are typically used for high precision modeling of smaller areas. DEM is a raster representation of a continuous surface from a grid of squares. DEM models are typically used in land use planning and flow direction studies. While developing elevation models contour lines help visualize the topology of the surface, which can be done using either model. 

One aspect of this lab was to develop a ski run suitability map using a DEM. After making the 2D layers visible in 3D the suitability map was able to be developed. From the elevation a slope and aspect raster were created. The elevation, slope, and aspect raster were then reclassified and then combined using the weighted overlay tool. The final suitability raster uses the following weights: 25% aspect, 40% elevation, and 35% slope. The map below shows the 3D image of the suitability map including proper lighting.


Another part of this lab included exploring a TIN model. Within this model slope, aspect, and edges were looked at. By using simple symbology when looking at edges you can click on any triangle and get its elevation, slope and aspect value. The map below shows the TIN model's edges and contour lines with a graduate color for slope.



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