Extract Points Along Line¶
Use this dialog to extract data from a point cloud object and place it in a new point cloud object. The purpose is to create a new point cloud object with a smaller data volume, making it more efficient to work with.
Where can I find the dialog?¶
In the context menu of the terrain model drawing, select Tools - Extract Points Along Line...
Using the Dialog¶
Starting point
The starting point is a point cloud object and a line, as shown in the figure above.
The dialog has four different methods for extracting data. These are numbered as steps 1 to 4 in the dialog. You choose which and how many steps you want to perform. If you perform multiple steps, the program runs them in the given order.
Step 1: Extract Points Within Profile Area¶
This is a useful way to extract data for an area along a line.
Example of extracting points within profile area
Step 2: Extract Areas Near Profiles¶
This is useful when you want to generate profiles at a given profile interval.
Example of extracting areas near profiles
Step 3: Extract Points Using Box¶
With this method, you can extract data inside or outside a box centered around horizontal and vertical curvature (0,0).
A* = Theoretical blasting profile, B = Normal profile, C = Max. height, D = Min. height, E = Left offset, F* = Right offset
Values are given in meters, with negative values for Left offset and Min. height.
Example
- Left offset: -10
- Right offset: 10
- Min. height: -1
- Max. height: 4
Step 4: Extract Points Using Layer Polygon¶
With this method, you can extract data inside or outside a polygon. The polygon is created based on a layer. For example, if you select theoretical tunnel profile, this layer is closed at the bottom so you get a polygon. You can also specify a value for parallel offset (positive value for a larger polygon).
A* = Parallel offset, B* = Theoretical tunnel profile
Note
You can use this method to extract points that are within the theoretical blasting profile, i.e., to detect bulges.