Unmanned aerial vehicle measurement method for digital elevation model of terrain image

Abstract

The present invention relates to an unmanned aerial vehicle measurement method for a digital elevation model of a terrain image, comprising steps of determining a route and a flight height of the unmanned aerial vehicle according to shape and area of a target area, deploying and controlling a mobile reference station to form a CORS reference station signal coverage network; and then releasing a measurement unmanned aerial vehicle and a ground accompanying positioning device, and acquiring photos, coordinates, elevation and other information, afterwards using Smart3D technology to synthesize the photos into a three-dimensional image model; arranging the surface of the generated three-dimensional image model according to a regular network structure and extracting sampling points, establishing a DEM by interpolating the sampling points; coding new sample points according the known geographic elevation information, and interpolating and correcting to form the digital elevation model of terrain image with a higher precision. The unmanned aerial vehicle measurement method of the invention replaces photo control points or physical points with the ground accompanying positioning device, eliminating the trouble of manually deploying and controlling photo control points, increasing the arrangement density of the positioning points and improving the measurement accuracy. The accuracy canreach 1-3cm for part of features points in the target area.

Description

technical field [0001] The invention belongs to the field of surveying and mapping, in particular to an unmanned aerial vehicle surveying and mapping method for digital elevation models of terrain images. Background technique [0002] Digital elevation model (Digital Elevation Model), referred to as DEM. It is a solid ground model that expresses the ground elevation in the form of a set of ordered numerical arrays, and is a branch of the Digital Terrain Model (DTM), from which various other terrain feature values ​​can be derived. It is generally believed that DTM describes the spatial distribution of various geomorphic factors including elevation, such as slope, slope aspect, slope change rate and other factors including linear and nonlinear combinations, and DEM is a zero-order simple single-item digital geomorphic model , other landform characteristics such as slope, aspect and slope change rate can be derived on the basis of DEM. [0003] Since DEM describes ground ele...

AI Technical Summary

Problems solved by technology

Although the accuracy requirements are met in a large range, the required investment is also huge. If the distribution density is reduced, the high-precision range provided by the system cannot completely cover the entire area

The CORS system has been widely used in some economically developed cities in the south, but because it requires multiple fixed base stations to form a full-coverage high-precision control network, the initial investment cost is huge, and it needs to be continuously operated in the later period. Therefore, from the input-output ratio Generally speaking, the western region with a relatively small population distribution is not suitable for building a large-scale, full-coverage CORS system

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