Background

The new Trimble SX10 Scanning Total Station has a published scanning range

error of 1.5mm +/-. The actual Range error is 1.5mm +/- at one sigma, or in real terms 4.5mm

+/-. (see fig. 1 attached)

For earthworks and many civil applications, the range error of 4.5mm +/- is of minimal

consequence and is hardly noticeable when surveying earthworks, road corridors, quarry

surveys etc…

However, when completing higher order surveys for feature deformation, monitoring, as-built

of new construction, etc… where construction survey tolerances are less than 5mm, this

becomes problematic. There are also concerns when scanning detailed features that are to be

meshed, the range error creates a rough result.

Observation

Though the Trimble SX10 Scanning Total Station produces a point cloud with an

overall thickness of 8-10mm, the mean of the point cloud yields a result of less than 1mm +/-

variation when compared to Total Station Direct Reflect observations.

Trimble Business Center currently has a Best Fit Line and Best Fit Arc routine

that will fit lines to the mean of a cloud section, but to the best of my knowledge there no

routines to filter and or reduce the point cloud to the mean of the point cloud, or to create a

surface mesh based on the mean of the point cloud.

Requested Features

1. Step 1 - The ability to filter the point cloud based on the mean of the point cloud. For

example: there would be a user variable to set the desired depth of points to retain

relative to the mean of the point cloud. (see fig.2 & fig.3 attached) If that variable was

set to 3mm, the resulting point cloud would have an overall thickness of 6mm and all

outliers would be removed.

2. Step 2- The ability to reposition the resulting points from step 1 to fit the mean of the

point cloud, all points remaining from step 1 would have their slope distances adjusted

relative to the scanner position so that they are repopulated at the mean of the point

cloud. (see fig.4 attached)

It's not real clear of your request. You can try having shorter scan times to help reduce the amount the SX10 gets out of level. Is that your issue?