Mount Saint HelensDownload sthelens4.sim ... The volcano Mount Saint Helens in southwestern Washington State USA is the focus of this single-terrain Landscape File. The simulation includes a full texture showing color shaded relief (with water bodies in blue) and two partial textures created from natural-color and color-infrared combinations of Landsat image bands. Each texture layer covers only its visible image area (they are not padded with transparent null cells to match the extent of the terrain). In addition, the file includes several billboard point overlays. One billboard overlay (TriLatPts) uses stalked symbols to show locations of survey stations used to monitor the volcano. This overlay was created from 3D vector points, and is turned on by default when you open the Landscape File. The other two billboard overlays can be turned on using the Layer menu; they were created from 2D vector points, and so must be selected for viewing with a particular terrain (even though there is only one terrain in this particular Landscape File). These two overlays show locations of visitor centers, ranger stations, and radio towers; their symbols were designed to sit on the terrain surface. If you edit the positions of symbols in the 2D billboard overlays, the symbols will remain on the surface as you move them. If you edit points in the 3D TriLatPts overlay, each stalked point retains its stored 3D elevation and so the stalk base may lie above or below the terrain in its new location.
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