> I, like Mr. Putnam, use a DNA 03. The 03 refers to the seconds of the digital level, much like a regular total station. I think that Leica has both the 3" and 10" digital levels.
I don't believe the designation is related to arc-second accuracy (3" in a 70 m shot would equate to 1 mm, which is far below the specification for this instrument). I think the designation is derived from the expected double-run accuracy of a 1 km line run with an invar rod. For the DNA03 this is 0.3 mm, and for the DNA10 0.9 mm.
That is what it means on the Trimble Dini levels as well.
Stadia set in meters?
I know that John. If you use a yard rod 1 full yard on the rod = 100 yards. Meter rod, 1 meter on the rod = 100 meters, foot rod 1 foot on the rod = 100 ft.
It doesn't matter how the rod is marked.
David, Think about it.
Stadia set in meters?
Actually, what I think Dave was referring to is that there were some instruments that had stadia hairs that were 333:1 instead of 100:1, for use with yard rods I believe. I have never seen an instrument with hairs like that, but they do exist.
Perhaps, but when I collimate my digital level it reads in seconds with the actual " sign. If that actually refers to 'arc-seconds', I don't think it does. But thats what I refer to them as because of the collimation units on the level.
Just looked at the specs, and Mr. Frame is right, I apologize for the loose verbage. I appreciate the correction. That would explain the decimals in the collimation. Thanks.
John
I had forgotten about those. The answer is in feet not yards. I have seen only ONE since I started surveying 44 years ago.
Hello,
On a piling job last year (800+ piles), the owner supplied me with a Sokkia SDL30 digital level. I never used that brand of equipment before. It performed well, very reliable in all fronts. Two great things that I remember:
-Excellent in Arctic weather; the job was in February-April in the Northwest Territories, I did not experience battery power issues. That surprised me.
-The cut/fill application is designed so that the elevation being staked is always displayed. The operator always have a visual on the elevation being sought as shots are taken.
I found it to be a good instrument.
:beer:
Stadia set in meters?
John, We had 2 Zeiss Ni2 automatic levels with 1:333 stadia constants at my old employer.
I have only used Leica digital levels (as far a digital). I don't know if there is a difference between that and other brands, but I am with the school of thought that once you have gone digital you won't want to go back. The closures are, simply-said, phenominal. Procedures are important for first or second-order work, but the numerical closures seem to always be great even with the lower-order level and lower-level procedures.
You do have optics and, generally, you can get a rod that you can turn around and read optically as well. I don't know if "demo'ing" one is enough to see the real value, but I highly recommend digital.
Leica invented the digital level, by the way, if that is something to consider.
There's my 2¢
P.S./edit: and you can read distances, in feet or meters, so the stadia-hair spacing is irrelevant.