combine two 3d polylines into a single polyline?

[wardie4k]

Hi Y'all

Is there a command to combine two 3d polylines into a single polyline? Either combine, take the mean between the two lines, or draw a third line at the mid distance between the two original lines?

The lines are created (in a .dxf) by a GPS unit in the field, and represent tracks needing to be mapped. Typically we would drive out a track and then drive back on the same track; this gives me two 3d polylines. Because of GPS errors it better practice to log the roads/ tracks twice. The lines can have from 2000 to 10000 vertices, so manually drawing is not an option. Any ideas? Thanks

[Organic]

RTK GPS is good to

 

If I was trying to solve your problem I would break it down into the following steps

a) Export the X, Y & Z coordinates of each 3d polyline and insert into Excel

b) Work out how you are going to merge the X, Y & Z coordinates (i.e. fixed interval, interpolation etc)

c) Construct these merged coordinates in Excel so you can then import them back into AutoCad

d) Draw the 3d polyline using those coordinates (e.g. using http://autodesk.blogs.com/between_the_lines/2009/06/import-xy-coordinates-from-excel-into-autocad.html)

[Tyke]

In Civil 3D there is the command JOINFEATURES that joins 3D polylines, but in vanilla AutoCAD its not there.

 

You could always use a LISP routine to do it, try this one http://www.black-cad.homepage.t-online.de/pediten.htm

[SLW210]

In Civil 3D there is the command JOINFEATURES that joins 3D polylines, but in vanilla AutoCAD its not there.

 

You could always use a LISP routine to do it, try this one http://www.black-cad.homepage.t-online.de/pediten.htm

 

CadTools has that feature as well.

[Tyke]

CadTools has that feature as well.

 

and its a freebie too