Road survey line selection method based on smart phone and digital topographic map

Abstract

The invention provides a road survey line selection method based on a smart phone and a digital topographic map. The method includes: calculating the feasibility of road repair of each pixel point ineach direction according to the elevation map of the survey area, and combining feasible points which are less than a certain distance and have the same feasible direction into one feasible point to obtain a pre-planned point; and setting a starting point and an ending point, obtaining a first path by using an algorithm, and screening according to the first path and the feasible direction of the pre-planned points on the path to obtain a pre-planned path; setting a road grade, and outputting a pre-planned road mask; detecting a non-passable area in the top view to obtain a non-passable area mask, and outputting a disaster-prone area mask according to the acquired information; and according to the road mask, the non-passable area mask and the disaster-prone area mask, carrying out implementability scoring on the pre-planned road, performing screening to obtain an implementable road map, and finally visualizing the implementable road map and other information in a smart phone through a WebGIS technology.

Description

technical field [0001] This application relates to the technical field of surveying, in particular to a road surveying and line selection method based on smart phones and digital topographic maps. Background technique [0002] The existing highway survey and line selection method is mainly to set the starting point and the ending point, and use the algorithm to calculate the path on the elevation map of the survey area according to the elevation difference between the starting point and the ending point. Select a location with sparse contour lines when selecting high lines. [0003] "A navigation method and device for field investigation, survey and search work in mountainous areas" published on August 1, 2016, discloses a navigation method that uses remote sensing images and topographic maps to jointly construct routes in areas without road network coverage , to provide routes for surveyors to conduct survey work. However, when calculating the route, it only considers the...

AI Technical Summary

Problems solved by technology

However, when calculating the route, it only considers the slope of the middle point of the survey area in the direction perpendicular to the two adjacent contour lines, and does not consider the slope of each point in other directions, nor does it consider avoiding disaster-prone areas. Therefore, the route provided by this method Not necessarily practicable to build roads

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