Support
Profiles by Regression
The generation of longitudinal profiles by regression is a TcpMDT tool designed to obtain the altimetric information of an alignment when no surface or digital terrain model of the area is available, but only isolated survey points in the vicinity of the route.
Reasons to use this command
The use of this command is mainly indicated in the following situations:
Absence of triangulation: It is useful in exceptional linear works, such as power lines or road alignments, where a Digital Terrain Model (DTM) has not been generated but a point cloud is available.
Direct elevation assignment: It allows profile elevations to be assigned directly from points near the alignment, avoiding errors that could arise from interpolation on a poorly defined surface.
Handling dense point clouds: When working with modules such as PointCloud, the regression strip allows projecting points from a dense cloud onto the designed line, acting as a quality and precision parameter to define the profile contour.
Command Configuration and Parameters
To execute the regression-based generation, the program first requests the alignment and then displays a dialog with the following key parameters:
Regression Strip: This is the most critical parameter, as it establishes the interval to the left and right of the alignment within which the program will search for points to project onto the alignment.
Point Selection: Allows filtering which points will participate in the calculation (by number, code, levels, etc.). It is important to note that the program automatically ignores points located on levels configured as "non-triangulable".
Station Management: In addition to defining the initial and final stations, additional stations can be added, whose elevations will be interpolated between the previous and next points with known elevations.
End Treatment and Null Elevations:
Interpolate Ends: If no points are found exactly at the start or end of the alignment, the program can linearly interpolate from the nearest distances.
Vertices with Zero Height: Allows deciding whether points with zero height are interpolated or directly removed from the generated profile.
Coding in the .LON File: The user can configure the profile vertex code to display either the original point code or its point number, facilitating traceability of the data source.
The final result of this process is a file with the extension .LON containing the distance from the origin, the elevation, and the reference point used for each vertex