Erase Surface from DWG

When you open a C&G surface (or TIN file, *.tin) it is shown on the screen as a graphic image overlaid on your drawing. You must use the Write Surface to DWG feature to actually create contour polylines, TIN lines, etc. If the surface changes due to changes in elevation or location of points you will want to erase the old surface and write the new surface to the drawing. However, once a surface is written to the drawing, it can be a difficult process to pick out all the surface entities in order to erase them from the drawing. This feature makes this an easy, one step operation.

You can use the items in this menu to erase the various topographic features: the TIN, Main Contours, Intermediate Contours, Break Lines, Include Boundaries, and/or Exclude Boundaries or All topo items.

Note: To erase contour labels use CG-Survey > Topo > Label Contours > Delete Labels

Pulldown Menu Location: CG-Survey > Topo