Lesson 3.4a Key Term Crossword - Weebly

point or object. 17. A relatively permanent object, natural or. artificial, bearing a marked point whose . elevation above or below the adopted . datum is known or assumed. 18. The starting point for a survey. DOWN. 2. The difference between the rod readings. at the stadia wires. 3. The vertical distance from the datum to. the line of sight of ... ................
................