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How do I make a footprint polygon of the extent of contour polylines?

Question asked by jcr326 on May 11, 2018
Latest reply on May 13, 2018 by

I have some historic contour data of an old river channel that has been digitized and after using Topo-to-Raster, I want to clip only the contoured area out (i.e., the excess interpolated data outside the highest contour). The contours follow the channel and then do not extend into the terrain above so all of that data is not needed (or good, for that matter). The easiest way (in my head) is to generate a one-polygon footprint of the contour polyline data and clip the raster that way, but I can't seem to find any simple way of doing. Any advice is appreciated!