It is used during daylight hours. The balloon is filled to such degree that its ascent rate is known. By measuring the time period between the start of the balloon and the moment it hides in the cloud can be determined the height of the cloud base.
imbrication lines (imâ³bro brÃ´Â´ika shÉn) , lÄ«nz.n pl. 1 the seams which are formed by overlapping layers of tissue in order to close a surgical. wound. 2 slight mesiodistal ridges in the cervical third of a. tooth
The black line is the original line added as proximity. The green line is how Civil 3D sees it. This type of breakline can be used when the XY values for a line are known, but the elevations are. unknown. The fourth picture shows a wall breakline in plan view. A wall breakline is like adding two breaklines, one at the real breakline elevation and one at the height you specify*.