Trimble Business Center

If you spatially sample your point cloud prior to making a surface from it, you'll have a lighter surface.  I have to spatially sample all point clouds in TBC before making surfaces if I ever need to import those surfaces or Recap exports to C3D because it will choke on a large point cloud or a surface (LandXML) created from a large point cloud.

Hope this helps.

@奈生 中村

You can draw a polyline (easier in plan view), either from the command line, or from the CAD tab, to make a boundary for your surface.  This is an effective way to thin out unnecessary data from your point cloud.

For example, if I have several stockpiles in one point cloud, I create a separate surface for each of them by:

1. Selecting only that part of the point cloud.
2. Then create a new point cloud region called "Area 1" or whatever you need.
3. Spatially sample only that "Area 1" region with all others turned off.
1. You can define how tightly you spatially sample the region (aka every 2 feet)
4. Then make a surface from only that spatially sampled region.
5. Next draw your polyline (in plan view) around your area or whatever topography with which you're working.
6. Then add that polyline as a surface boundary for your new surface.
7. This is the best way I've found to get lighter local surface data from a specific area, from a large point cloud.

If you need to get your surface into something else, like Civil 3D, you can export the point cloud region as a Recap project and drag-n-drop it into C3D.  You can also export your newly created surface as a LandXML file (Export => Construction Tab).  C3D has a command to import a LandXML.

Brian C

If you spatially sample your point cloud prior to making a surface from it, you'll have a lighter surface.  I have to spatially sample all point clouds in TBC before making surfaces if I ever need to import those surfaces or Recap exports to C3D because it will choke on a large point cloud or a surface (LandXML) created from a large point cloud.

Hope this helps.