The four major lakes are shown from southwest to

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Unformatted text preview: the Ice Lake Basin bookmark that you viewed earlier in ArcMap. The four major lakes are shown (from southwest to northeast – Fuller Lake, Ice Lake, Island Lake, and Clear Lake). Return to the Ophir 3D view bookmark. 3. In ArcToolbox beneath the Table of Contents, double click on the 3D Analyst Tools toolbox, followed by the Raster Surface toolset. Double click on the Hillshade tool. In the Hillshade dialog box, choose the Ophir DEM layer as the input. Click the button to the right of the Output raster box. In the Save As dialog box, browse into your lab9\data3D folder. Type hillshade in the Name 3 box. Click the Save button. In the dialog box, the azimuth and altitude values indicate the position of the artificial illumination source relative to the landscape. Azimuth values can range from 0° to 359°, while altitude values can range from 0° to 90°. The default values shown in the Hillshade dialog box indicate that the fake sun will be shining from the northwest (315°) and be 45° above the horizon. Do not change these default values, or the Model Shadows or Z factor settings. Click the OK button. The hillshade processing status will appear for a few seconds near the bottom right corner of the ArcScene window. When the processing is finished, turn off the Ophir DEM layer, but do not remove it from the Table of Contents. 4. Examine the hillshade values listed in the Table of Contents. The values range from a low of 0 to a high of 254. These are not elevation values; they are simply indications of brightness in the hillshade image. Based on the artificial illumination source, grid cells with values of 0 were in complete shadow, while values of 254 indicate full sun. Open the Layer Properties dialog box for the new hillshade layer. Click the Source tab. The information beneath this tab includes various characteristics of the raster data set (the cell size at 10 m x 10 m, the uncompressed size of the DEM in MB, the map extent in UTM northings and eastings, the projected coordinate system and datum, etc.). Click the Symbology tab. Raster layers such as DEM...
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This document was uploaded on 04/01/2014.

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