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Point clouds > InRoads DTM ?

Martin Moth-Lund

Hi

I have not worked with point clouds (yet), but is wondering what it takes to create an InRoads DTM from a point cloud (which could originate from an ASCII file with XYZ for each point, comming from a laser scanning)

  • I guess I could just import the points to an InRoads Surface as random points. But my guess is that there are millions of points, and therefore the DTM will be too large to work smoothly. But there are functions as "this surface" that may be used...
  • And what if you have points placed above other points - how does InRoads solve this? If the point cloud containg a road and a bridge crossing over the road...
  • Is there a function to automatically find breaklines in the points?
  • Then you have CloudWorx (which I only know by name) - what can it do for me?

I found this, but I guess thet methods have improved since 2002... (2 men working with data in 15 days) 

To put it short - If I have a point cloud (eg. in urban sorroundings), and want to use the data while working in InRoads, what is the workflow?

Any experience, any thoughts, any links to where I may read more is welcome

Parents

  • In the 3 projects I've used lidar survey on, the surveyor has always provided .LAS files for us.  InRoads has two application add-ins that work on these.

    First, the "Import LAS add-in" reads the data and dumps it into a DTM (as random points like you said)

    Then the "Thin Random points add-in" gets rid of extraneous data. 

    If you have a bridge in there, you will have to fence/copy that out into a seperate dtm.  Usually the surveyor will strip out the trees and foliage ahead of time. 

    You're on your own adding breaklines.
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  • In the 3 projects I've used lidar survey on, the surveyor has always provided .LAS files for us.  InRoads has two application add-ins that work on these.

    First, the "Import LAS add-in" reads the data and dumps it into a DTM (as random points like you said)

    Then the "Thin Random points add-in" gets rid of extraneous data. 

    If you have a bridge in there, you will have to fence/copy that out into a seperate dtm.  Usually the surveyor will strip out the trees and foliage ahead of time. 

    You're on your own adding breaklines.
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