A Mountainous Road Extraction Method Based on 3D Feature Description Model of Laser Point Cloud

Abstract

The invention discloses a mountainous road extraction method based on a laser point cloud three-dimensional feature description model. The steps are: using the laser point cloud echo signal number information to initially filter non-ground points and perform ground point filtering to obtain a ground point set; constructing a three-dimensional feature Describe the model to extract the characteristics of mountain roads; establish a grid index for the point set on the ground, perform local surface fitting, find the slope value of the surface section corresponding to the grid center point and assign it to the grid; calculate each grid and the adjacent eight The eight-way slope difference of the grid; formulate the corresponding relationship curve between the local slope difference and the slope difference weight, substitute the eight-way slope difference of the grid into the curve and sum the obtained weights to obtain the characteristic factor of each grid, formulate The feature factor threshold is used to filter the non-road grid to obtain the initial road point set; the threshold interval is set to filter the initial road point set to obtain the candidate road point set; the area where the candidate road point set is located is rasterized and binarized to obtain the refined road point set mountain road.

Description

technical field [0001] The invention belongs to the technical field of geospatial information systems, and in particular relates to a mountainous road extraction method of laser point cloud data. Background technique [0002] Mountainous roads are important infrastructures that play a role as a lifeline in the process of emergency relief. The rapid and accurate extraction and update of mountainous road information is of great significance for disaster relief. Value. Airborne laser scanning is a laser detection and ranging technology, which records the ground information by receiving the echo signal of the laser beam emitted by the on-board laser equipment to the ground. Airborne laser scanning can obtain data such as the three-dimensional coordinates of the surface, the number of echoes, and the reflection intensity. Compared with traditional remote sensing methods, such as aerial photogrammetry and radar interferometry, airborne laser scanning technology is less affected ...

AI Technical Summary

Problems solved by technology

This method is fast and logically simple, but this method mainly focuses on slope information, without considering the characteristics of terrain slope changes. For mountainous roads with large areas of gentle slopes or valleys, the extraction accuracy and efficiency will be greatly affected. Environmental adaptation Weaker

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