Sets 7 - 13 (modelling instrument centering)
I'm going to get distances to my targets and approximate setup tonight if that helps the modelling.
I have a different instrument which I'll use to produce some more sets and do the V test.
Sets 7 - 13 (modelling instrument centering)
> I'm going to get distances to my targets and approximate setup tonight if that helps the modelling.
>
> I have a different instrument which I'll use to produce some more sets and do the V test.
It would be good to have decent distances to the targets, or at least three or four of them from which the rest could be worked out on the assumption of planarity.
BTW after working on your test results again, I'd say that probably a standard error of +/-0.30 mm is a better value for centering with the laser plummet than the +/-0.24mm typical of careful work with an ordinary magnification optical plummet. At least, the s.e. of the N values is +/-0.30mm. I missed that earlier because the E values were included in the testing of the residuals of the coordinate values in the adjustment and should not have been.
Sets 7 - 13 (modelling instrument centering)
> I'm going to get distances to my targets and approximate setup tonight if that helps the modelling.
>
> I have a different instrument which I'll use to produce some more sets and do the V test.
BTW, I meant to ask: are you logging the angles in grads? The values in DMS appear to have been converted from grads.
Sets 7 - 13 (modelling instrument centering)
Yes I am recording in grads to make my excel calcs easier.
Target coordinates.
Here are some coordinates for you. I think they're decent, but I wouldn't bank on them being in the same position as the day I did the work. Perhaps northings are a couple of mm out.
The distance from target 1 to target 26 agrees with a steel ruler within 0.2mm (248.7mm by ruler) so that's a good check on the scale of the baseline established by the EDM. This one's specced to 2mm+2ppm I think. If I'm not mistaken, in a series of intersections the error in your baseline goes into the scale of the target area as a ratio of the size of your target area to baseline width. I established these points off a 1.65m baseline. So even allowing for a 2mm error in my baseline the width of the target area wouldn't have been off by more than 0.3mm.
Another side effect of this exercise has been testing the accuracy/scale of a cheap laser plotter. I've got enough confidence to plot targets for any survey type from it now. The inter target distances are very consistent.
POINT EAST NORTH
S1 0.0000 0.0000
1 0.0000 2.4221
2 0.0100 2.4217
3 0.0200 2.4213
4 0.0301 2.4208
5 0.0401 2.4203
6 0.0500 2.4198
7 0.0599 2.4193
8 0.0698 2.4187
9 0.0798 2.4182
10 0.0898 2.4177
11 0.0997 2.4171
12 0.1097 2.4166
13 0.1197 2.4161
14 0.1296 2.4157
15 0.1395 2.4151
16 0.1494 2.4145
17 0.1593 2.4140
18 0.1693 2.4133
19 0.1796 2.4128
20 0.1892 2.4123
21 0.1992 2.4117
22 0.2090 2.4112
23 0.2189 2.4107
24 0.2288 2.4102
25 0.2387 2.4097
26 0.2486 2.4092
Target coordinates.
> Here are some coordinates for you. I think they're decent, but I wouldn't bank on them being in the same position as the day I did the work. Perhaps northings are a couple of mm out.
I'll plug those values into the adjustment this evening to see how things look.