1) Across 2) Via 1) Getting across 
• (p. pr. & vb. n.) of Traverse • (a.) Adjustable laterally; having a lateral motion, or a swinging motion; adapted for giving lateral motion.
(from the article `surveying`) ...few accurate measurements that cover the area of the project and from which short, less accurate measurements are made to the objects to be ...
a series of control points linked by lines known as legs, the length of which and the angle between them is accurately recorded. See Measured Survey. 
Moving horizontally across a slope so as to lose or gain a minimal amount of elevation.
high or low level moving left to right rather than up