Menu: Survey / Edge 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.
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 the parameters:
Direction tolerance: Maximum deviation 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. This value must be kept low for the algorithm to work properly.
Distance tolerance: Buffer to find the next point. If too high, the algorithm may connect different edges together.
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.
Highest points / Lowest points: Select which chain to generate either the top edge, bottom edge or both edges of the sidewalk.
Starting parameters:
Results of the detection and point management:
