Haven't posted in awhile, hope everyone in the rest of the US is thawing out. We are finally seeing some ground here in SC.
Tomorrow, I want to map a new, arrow straight section of highway (about 4,000) for as-built documentation to use for preliminary planning of adjoining infrastructure. No traffic, rural location. For control I have new water valve boxes and line marker monuments. Good targets, the problem is that I don't have elevations, only horizontal coordinates. If I assign a static elevation to all control points, will I get a good map for horizontal use only? I realize vertical will be off but really don't need it for my purposes. Land is very flat. Elevations at grade I wouldn't expect to vary more than 2 or 3 feet; however, location markers extend several feet above the ground (concrete monuments). With top elevations above grade, would lack of an elevation shot present additional problems?
Thanks to all in advance for any input,