I have been tracing over contour lines from an image that I downloaded from my county's website. I created a terrain perimeter and then went so far as to 'Build Terrain'. Being that I did not complete tracing all the contours and entering all of the elevation data, I did not expect desired results. So now, my 2D image has both traced and CA generated contour lines. I keep clicking on the 'Clear Terrain' icon but nothing happens. I was expecting that when I click this icon that the CA generated contours would have disappeared, leaving only my traced contours, so that I may continue tracing. Why does this not happen? Am I missing something. Thanks you all for your help.
