you can use the add line functionality without deleting the lines already there. It works like a mass swap edge command. It treats the line yuo want added as if it were a breakline and then swaps all the necessary edges to conform. this will avoid the "black holes" that occur when deleting interior tin lines.
From now on I will 'Add Lines' only...
Whoa, step back! Too extreme....this is kind of subtle now....
That's not what she's saying. She suggests deleting surface points rather than deleting surface lines. Deleting surface lines creates holes.
Deleting surface points causes re-triangulation and does not create holes.
I like the one person's suggestion of placing a surface point just to get triangulation going over the hole, and the deleting the surface point.
"you may want to limit the surface definition to the points and contours only."
This approach typically does not allow the new surface to sucessfully emulate the V-shape of the contours in drainages, nor the depict the correct longitudinal slopes of the drainages provided by the breaklines.
Perhaps try adding the points and breakilnes first, then add the contours as breakilnes. Then choose to Allow Crossing Breaklines with the option Last selected.
Hey Fred. With field shot data things are different because the data is much more accurate. In these cases I agree the build order and I would never exclude breaklines. When dealing with aerial topo pavement breaklines rarely match contour elevation in my experience (I think that is the issue in this post) and rarely do I see a well defined crown in these contours. We also have bld outlines at roof elevation and other things to deal with like the fact that it will never match the original perfectly and it's most likely not accurate enough to build with (at least in our area). In that case, for my purposes, I want my new contours to be smack on with the source. My map will match their map. I don't want anyone asking why contours are different. So with the points and contour only method I get a great match in less than 5 min almost every time. The last thing I want my staff to do is spend 1/2 a day fixing work that was already completed by others.
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