Digital elevation model (DEM)-based topographic slope analysis method

Abstract

A DEM-based topographic slope analysis method disclosed by the present invention comprises the steps of combining different resolutions based on the DEM data, and calculating and extracting the slopedata of a raster matrix within a certain territorial scope; aiming at the concrete requirements of the topographic slope, dividing the grades of the slope requirements according to the rules, respectively comparing with the actual slope data matrixes to obtain a plurality of comparison result matrixes, fusing and superposing the comparison result matrixes to generate the slope requirement matrixes, and then distributing the colors according to the element values in the comparison result matrixes to fill, and generating a vector diagram; and finally adopting a projection algorithm to convert the vector diagram to obtain a slope analysis vector diagram satisfying a projection mode. The present invention provides a more visual and accurate topographic display form and analysis method for themilitary and civil fields having certain requirements for the topographic slope fluctuation, such as the helicopter landing, the search and rescue, the path planning, etc.

Description

technical field [0001] The invention relates to a topographic slope analysis method, in particular to a DEM-based topographic slope analysis method. Background technique [0002] Terrain slope analysis and rapid and accurate display have significant guiding and helpful significance in military and civil fields that have certain requirements for terrain undulations. For example, when carrying out helicopter search and rescue, the selection of the airfield is an important part of the search and rescue operation. The correct choice of the airfield can effectively take advantage of the helicopter's advantages and directly reach the disaster destination, which is of great significance to the completion of the search and rescue mission. The airfield should have One of the conditions is: close to the target of the scheduled search and rescue; the terrain is flat, and there are no obstacles that hinder the landing; there is enough area to facilitate aerial identification; therefore,...

AI Technical Summary

Problems solved by technology

[0004] At present, when choosing a helicopter landing site, terrain elements mainly rely on map experience and naked eye observation during the mission process to make decisions. There is a lack of a fast and intuitive terrain slope analysis method and method based on digital maps in different modes, which can provide decision makers in mission execution. Before, provide an intuitive and effective task execution area and its surrounding terrain slope conditions, select the landing field in advance, and provide a reference for the rapid implementation of the task

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