You can can topographic contours from your DEM in sdf format. The sdf format is a vector, not a raster. The sdf can also be imported so they'll be AutoCad polylines. As you can tell, obtaining usable CONTOURS from a DEM is a two-step process, not a simple click-and-I'm-done deal (usable means you can use them to create a surface).
To Create Contour Lines:
Right click PratoSite08AUG in the Map Task Pane then select Create Contour Layer from the shortcut. You'll be presented with options to select contour interval, major contours, elevation in feet or meters, and the folder where you wish to save the contours (in sdf format).
Using MAPIMPORT command on the sdf contours, you can then create, or convert them to polylines. Be sure to 'Create Object Data" during the import so your contours will have elevation 'data.' This data is important b/c it can be use to 'elevate' or raise your contours from z=0 to their proper elevation using the Query and Alter Properties functions.
By using QUERY and ALTER PROPERTIES functions together, the contours will be 'raised' and once raised can be used to build your surface. Back in August 2011, Brian Hailey did an excellent job explaining this procedure. You can read about it >>HERE<<.
Chicagolooper
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