Versions Compared

Old Version 1

changes.mady.by.user Solutions Geo-Plus (Unlicensed)

Saved on

compared with

New Version 2

changes.mady.by.user Solutions Geo-Plus (Unlicensed)

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Version française

Menu: Survey / Edge Sidewalk detection

This tool automatically detects

the edge of a sidewalk and vectorizes

the top and bottom

edges. The first is the top edge of the sidewalk while the other is the bottom at the road level. After the detection, the “Pick points” window will appear and let the user decide whether the points must be saved in the database, exported or transferred as an alignment.

of a sidewalk and vectorizes them. The detection will create points along the edge as long as the parameters are met. This function needs a good density of points so that the edges are correctly detected.

It needs two points on an edge to start its detection. Here is a list of

Here are the parameters:

Direction tolerance

  • Lenght: Maximum

deviation

  • legnth of the

polyline from one segment to the next.

  • Min. segment length: Distance between each point in the polyline.  

    • Elevation tolerance: Maximum difference of elevation from the edge for points to be considered

    • search box

    • Width: Maximum width of the search box.  

    • Height: Maximum height of the search box. This value must be kept

    low

    • as close to reality as possible for the

    algorithm Starting point: To specify the starting point, first select the “Pick 2 Points” button and pick the point where the edge must begin and another point on the edge for global starting direction. Both coordinates will be entered

    • detection to work properly.

  • Distance tolerance: Buffer to find the next point. If too high, the algorithm may connect different edges together.

    • Seg. Length: Maximum distance for the segment to be considerate valide.

    • Tol. distance: Maximum tolerance to search for the next point.

    • Tol.deviation: Maximum deviation of the polyline from one segment to the next
    • Tol.verticality: Maximum angle to detect the bottm of the curb (deviation from the 90° reference).
    • Min. point:  Minimum of points within the box to be considerate valid for the detection.

    • Highest points / Lowest points: Select

    which chain

    • a Pcodes to

    generate either

    • the top edge

    , bottom edge or both edges of the sidewalk.

    Starting parameters:

    Image Removed

    Results of the detection and point management:

    Image Removed

    • & bottom edge to identify the type of element in your CAD.



    Once the parameters are setup, you will have to go to "Search by" and select between 2 options.

    • Two points: You will pick the starting point of the detection and the 2nd point will indicate the direction to follow for the detection
    • By Trajectory: Select an alignment or the camera path (For MMS) for automatic batch detection. You will have to select the offset left & right (search distance from the trajectory) and the start/end of the search by entering the index number for each or clicking on the point cloud directly ( you will need to click on "Start index" and "End index" respectively prior to click on the point cloud).

    Once the mode selected, then click on "Start detection"

                                                                                                                    Image Added


                                                    

    Image Added

    Image Added

    Once the detection is done you will have the possibilty to adjust the vectorization to fit better your point cloud. To do so, you have access to "Fitting"

    • Fit in XY: Straighten the lines in X & Y
    • Fit in XYZ: Straighten the lines in X, Y & Z
    • Spline: Adjust the line to follow the curb
    • BSpline: 

    Image Added

    Once you are done with the detection, you will have the option to:

     


    Image Added