mrdavidares

Thank you Mick. Experimenting, I found that the reason that I was not getting the desired effect was because I had the Perspective Camera Overview. Once I deleted that tab, the CA generated contours Cleared.  Thanks again

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.