Automatic extraction method for road information based on point cloud

Abstract

The invention discloses an automatic extraction method for road information based on point cloud, and relates to the fields of mapping and road engineering design and management. The automatic extraction method comprises the following steps: data acquisition: after the selection of a GNSS (Global Navigation Satellite System) base station and the qualified check of acquiring equipment are finished, point cloud data is acquired through a mobile platform; data preprocessing: the acquired original data is preprocessed to output needed point cloud data; point cloud filtering: the point cloud data is filtered through filtering processing software, and accurate point cloud classifying achievements are obtained by the automatic classification and local human-computer interaction classification; interest extracting: the filtered point cloud is used for extracting ground feature information, and the ground feature information is output by the needed format. The automatic extraction method has the following advantages: the precise extraction of two-dimensional and three-dimensional road information is realized under the condition of not interrupting the normal traffic operation; the deep processing additional value of preliminary survey phase achievements is improved; the integration of preliminary survey and location survey operations of roads is realized; and the entire construction cost of projects is largely reduced.

Description

technical field [0001] The present invention relates to the field of surveying and mapping and road engineering design and management, in particular to a point cloud-based automatic road information extraction that can automatically obtain accurate two-dimensional and three-dimensional road information without interrupting traffic, and can replace manual road measurement method. Background technique [0002] A road can literally be described as a path leading from one place to another. In daily life, we tend to think of a road as a road for people, horses and vehicles; a passage between two places. However, with the development of social processes, roads have been endowed with new concepts. For example, the routes traveled by trains, the waterways operated by ships, and the infrastructure for vehicles and pedestrians can all be called different manifestations of roads. [0003] With the continuous and rapid development of social economy, the traffic volume of roads is incr...

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Problems solved by technology

[0006] (1) There are many shortcomings in engineering survey, such as heavy workload, high project cost, long operation period and high labor intensity, and great impact on existing road operation, which cannot meet the requirements of low cost, short construction period and high precision of survey and design by the highway management department. and high quality requirements and other practical requirements;

[0007] (2) Engineering survey requires field surveyors to work on the road. In order to meet the requirements of the survey work, one method is to temporarily close the survey section to ensure the safety of field surveyors, but this operation method seriously affects road transportation. The normal operation of the management department has had a relatively large negative impact on the normal operation of the economy and society; another method is not to close the expressway, and the operators work on the road surface, and only give warning reminders on the working section. However, due to the high speed of road vehicles, This operation method is difficult to ensure the safety of field surveyors, and there is a great potential safety hazard;

[0008] (3) The traditional digital aerial photogrammetry adopts stereo mapping method to collect 3D terrain on the ground, which has a low degree of automation and the accuracy of the extracted terrain elevation is poor. The accuracy requirement of 0.1m error in the height of the mid-pile cross-section map in the survey stage naturally cannot solve the requirements for the mid-pile cross-section survey in the later stage

[0009] When methods such as engineering survey and traditional aerial photogrammetry are used in the process of road reconstruction and expansion, survey and deployment of facilities around the road, there are inevitably hidden dangers in operation safety, affecting on-site traffic flow, high project cost, long development cycle and low product accuracy, etc. question

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