Contour line generation method and device

Abstract

The invention relates to a contour line generation method and device, and belongs to the field of the geographic information system. Firstly a digital elevation model based on a Delaunay triangulation network is established, and the form of the network shape is improved; then the network shape is corrected according to various terrain lines, fracture lines and surface feature symbols so that a DTM is ensured to restore the original terrain according to the actually measured data to the greatest extent; then the contour line is tracked according to the accurate DTM so that the accuracy of the contour line is guaranteed; and finally the curve polygon boundary of the contour line for the surface feature symbols is disconnected so that the problem of disconnection processing of meeting of the contour line and the surface features, especially overlapping features and large area features, can be greatly solved. The established DTM can be used for tracking the contour line and can also be used for the field of earthwork and stonework computation and section processing and engineering design. Therefore, the elevation model is also established in slopes and roads and other areas with no requirement for drawing the contour line.

Description

technical field [0001] The invention relates to a method and device for generating contour lines, belonging to the field of geographic information systems. Background technique [0002] In topographic maps, an important means of representing landform relief is contour lines. In conventional planar mapping, contour lines are manually drawn in the field. In the automatic drawing, the algorithm for the computer to automatically draw the contour line is quite complicated, and it is also one of the difficulties of the automatic drawing system. It first needs to establish a digital elevation model, that is, to network the irrelevant discrete points collected in the field, that is, to establish the connection between the corresponding discrete points, and then directly interpolate on the network model to draw the contour. Lines (also known as contour lines). [0003] The contour line in the map is different from other general contour maps. It requires high precision. At the same ...

AI Technical Summary

Problems solved by technology

In addition, according to the customary requirements of the map, the contour line needs to be disconnected when encountering ground objects, notes, etc., which brings great difficulties to the automatic drawing of the contour line by the computer

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