Extract Slope Edge

Clicking the Extract Slope Edgebutton in the Extractpanel of the Action Tab will put the current mode into Extract Slope Edge.

Note:For point clouds that have a high density, the time taken to process using these features could be quite considerable so it is advised that the cloud is Cleaned prior to running these routines. For most clouds, the Duplicated Points Distance Thresholdcould be set to 0.04 (which is approx. 0.5 inches) or if using a metric cloud, set the value to 0.012.
Polyline Layersets the layer that the newly created data will go into. Click on Setto bring up the layer manager.

Segment Connectis how the segments will be joined; direct, intersector rounded.

Search Len is the length at which the routine will search on each slope. When set to Autoit tries a wide range of search lengths and then tries to pick the best one to extract data. By setting it to Customyou can force the search length. Normally, Autoworks well but it depends on the clarity of the edge.

Draw Slope Edge

  1. The tooltip will ask to pick a point on the face of the 1 stslope – pick a point that will contain a number of points for the routine to use

  2. Pick a point on the edge of the two slopes – for example, the edge of a cliff

  3. Pick a point on the face of the second slope, again ensuring that enough data is included

  4. The lines need to be long enough so that the routine considers a decent amount of points along this Cliff edge; we're defining slope one and then slope two with each line respectively

  5. Lastly, pick a second point along the edge of the Cliff just to indicate direction

  6. It will now search for the edge between the two slopes

    7. If it stops due to an object in the way (or goes off course) use the Undo Last Segmentbutton to remove a number of segments then use Continue Edgeand redefine the template further along.


    Reverse Direction will continue the linework in the opposite direction from the initial starting point.

    Apply Best Fit can create a line of best fit through the created segments. Once done, click End Edge.

    If the profile of the slopes change too much, the routine will stop. If it goes around a curve, tick the option detect curves. Note: this option works best on well defined edges.


    Tab Location(s): Action Tab
    Panel and Button: Extract Slope Edge
    Prerequisite: Open scene of a scan or cloud




















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