A digital elevation model automatic adjustment method and system based on contour line stretching

Abstract

The present invention relates to a digital elevation model automatic adjustment method and system based on contour line stretching. The method includes loading an aerial survey stereo image pair and a digital elevation model containing contour lines, and selecting a target adjustment area in the digital elevation model. , and select the stretch vector according to the target adjustment area; calculate the deformation amount of the contour line in the target adjustment area according to the stretch vector, and deform the contour line in the target adjustment area according to the deformation amount to obtain a new contour line; adjust the elevation of feature points on the contour line in the digital elevation model according to the deformed contour line. By selecting the rope vector in the target adjustment area, and calculating the deformation of the contour line, a new contour line is obtained, and then the elevation of the feature points on the contour line in the digital elevation model is adjusted to make it consistent with the real surface conditions It is more consistent, realizes the automatic batch adjustment of the digital elevation model, without manual intervention, greatly improves the processing efficiency, and the adjusted digital elevation model has higher data accuracy.

Description

technical field [0001] The invention relates to the technical field of photogrammetry, in particular to a method and system for automatically adjusting a digital elevation model based on contour line stretching. Background technique [0002] Digital elevation model (Digital Elevation Model), referred to as DEM, is to realize the digital simulation of ground terrain through limited terrain elevation data (that is, the digital expression of terrain surface shape). A solid ground model is a branch of the digital terrain model (Digital Terrain Model, referred to as DTM), from which various other terrain feature values ​​can be derived. In the digital elevation model, the contour line is usually used to represent the nodes with equal elevation on the topographic map, and the closed curve formed by connecting the points with the same altitude on the ground is vertically projected onto a horizontal plane, and scaled on the drawing , the contour line is obtained. The contour line ...

AI Technical Summary

Problems solved by technology

In the prior art, feature lines are usually added manually in the digital elevation model, and the elevations of the nodes on the feature line are modified. This method requires more manual intervention, is time-consuming, laborious, inefficient, and accurate. Can't meet the requirements very well

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