Preliminaries
____ 1. Start ArcCatalog. Use Connect To Folder to place the
[___]IGIS-Arc\River
folder in the Catalog Tree. Launch ArcMap from ArcCatalog. You want a Blank Map.
“Extensions” are additional software packages that extend the capabilities of the main software. If you have the authorization to use an extension, then it was probably loaded on the hard disk with the rest of the ArcGIS Desktop software.
____ 2. Make the ArcMap window occupy the full extent of the screen.4 Enable the 3D Analyst and Spatial Analyst extension with Customize > Extensions.5 See Figure 2-9. Close the Extensions window.
[___]IGIS-Arc\River
Make sure that the List By Drawing Order button (rather than List By Sources, List By Visibility, or List By Selection buttons) is active at the top of the T/C pane.

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