Least Squares Adjustment for Level Runs
It will be a mute point is a couple of years since passive BMs will be obsolete. Beat the rush to clean you office and send my you LS15 now.
Do you have any literature to back up this statement? Who makes the LS15? Were you joking?
Whether you want to is another story
I have no experience using a least squares adjustment (LSA) in any aspect of surveying. I can read about in a textbook, but I don't know how it's used in the real world. It seems to me that the key words in its use are "redundant observations." I conclude that topo traverse points elevated in a straight level run between two published benchmarks don't warrant the use of LSA because the traverse points have only been observed once. I further conclude that running at least two looped or straight level runs between two published benchmarks, in each case, through a new benchmark warrants a LSA on the new benchmark.
The LS15 is Leica's current 1st order digital level.
I just read about it. I wonder if Leica has solved the problem of shade on a level rod with this new level.
The shade issue was a big problem with the old NA2002 levels but I have not had much troubles with the DNA03. I'm sure the LS series is an improvement. These instruments are based on visible light cameras so you have to figure that lighting conditions are going to effect them some.
Vegetation is also a digital-killer, as the level needs a clear view of a relatively large patch of rod in order to obtain a reading. So if you're trying to look through leaves or between branches, it doesn't work well, if at all.