This week we moved from data quality to started looking at surface information. We created 3d visualizations of elevation models, and examined TINs and DEMs.
TIN, Triangular Irregular Network, is a vector display of triangles formed between elevation points the sides or edges of the triangles cover the study area without overlap or gaps to interpolate changes in elevation over distance to provide estimates of slope. Displayed above is a TIN. The triangular network is visible with graduated color of slope and contour lines with darker index contours.
DEM, Digital Elevation Model, utilizes raster data stored in the raster cells. The cell data is processed utilizing a model like nearest neighbor, 8 cell window, or other to provide elevation data.
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