The condition where two survey stations or monuments have a direct line of sight between them, free from obstructions like trees, buildings, or terrain. This is a strict requirement for conventional optical surveying, as the instrument operator at one point must be able to see the target or prism at the other. If points are not intervisible, surveyors must establish intermediate traverse points to connect them.
Heard on the job
The property corners in the woods aren't intervisible, so we'll have to traverse around the perimeter.