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TBC v5.30 - Position and rotate pointcloud

Question asked by Nico Louagie on Jun 8, 2020
Latest reply on Jun 12, 2020 by Rui Wu

Yesterday, I've tried to position a pointcloud. Somehow, I have a scan with no coördinates (total station has no coördinates). In fact, in this case, it was a good thing, because it was a standalone scan which I had to position into a greater scan, but without the necessary overlap. So, I calculated the position (and rotation) it had to have based on other measurments. In the scan I have two point: the position of the total station and the opening direction (which is displayed by a point with coördinates in TBC). I've exported this line (two points you know) to my CAD software to calculate coördinates for both points. I went back to TBC and entered these coördinates in these points.

That doesn't work. After entering the first point (and recomputing of course), the pointcloud is in the correct position, but not the correct oriëntation. Then give the second point (oriëntation point) coördinates and recompute. Strangely enough, now the second point is correctly positioned, but I don't think the cloud is rotated, so the coordinates of the first point have changed.

Ok, let's try this another way: "Transform Survey Points". Same steps, but now I get a gigantic "H Residual", what is not plausible or possible, since the distance between the original coordinates and the calculated coordinates is exactly the same. I've checked the distance in my CAD-software and in TBC to be sure. If I do the transformation, I get the same onlogically result as in the first method.

 

Am I doing something wrong, or is this a bug, or even a limitation?

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