Web end three-dimensional scene attitude self-adaptive path roaming method considering topographic relief

Abstract

The invention provides a Web end three-dimensional scene attitude self-adaptive path roaming method considering topographic relief, which comprises the following steps: acquiring an existing element graph of an ecological space, the existing element graph of the ecological space having continuous XY coordinate points; simplifying the existing element graph of the ecological space by using a Douglas node suction algorithm, and taking the reserved node as an automatic roaming path node; calculating a roaming attitude parameter of each frame of three-dimensional scene in real time on the basis of the automatic roaming path node in combination with topographic data in the three-dimensional scene; and performing real-time rendering and refreshing on the three-dimensional scene of each frame in the Web-end browser, and completing the process of automatic roaming along the automatic roaming path node. The invention does not depend on manual roaming records, automatic roaming browsing can be quickly performed based on different ecological space elements, three-dimensional scene pictures are normal in the whole advancing process, timely fluctuating and smooth turning are performed, and the automatic path roaming effect of the Web end three-dimensional map is improved.

Description

technical field [0001] The invention relates to the technical field of three-dimensional scenes, in particular to a web-side automatic roaming method along the path, which is suitable for automatic roaming in common areas of different ecological spaces, comprehensive roaming path automatic extraction, and three-dimensional scene attitude adaptation technology taking into account terrain fluctuations. Background technique [0002] In the remote sensing monitoring of ecological environment, there are many demands for automatic regional roaming and browsing based on three-dimensional maps. It is often necessary to conduct three-dimensional automatic roaming and cruise browsing of a certain ecological protection red line area, nature reserve, national park, along important highways and railways, and along important rivers. In the automatic roaming of these areas, the key positions and targets of browsing are different, and the regional topographic features are also varied, and t...

AI Technical Summary

Problems solved by technology

[0007] Under the automatic roaming method of the set route, because the roaming areas such as the ecological protection red line are mostly planar or linear elements with clear boundaries, the number of nodes in different regional elements varies greatly, and the density of nodes in different segments is different. When feature nodes are used as roaming path points, there are usually problems of frequent direction switching and abrupt turning at each node.

At the same time, because the roaming areas such as the ecological protection red line are mostly distributed nationwide, the average altitude of different regions is very different, and the characteristics of the terrain fluctuation intensity are different, and the element nodes only have X / Y coordinates and do not contain elevation information. Roaming uses a fixed attitude and altitude method. When the altitude is set too low, it is inevitable to penetrate the terrain when passing through certain locations. If the attitude or altitude is set too high, when passing through low-lying or flat areas, it will It is far from being able to clearly view the surface conditions

[0008] In the roaming method of "scene snapshot + angle of view transition", although the camera height is recorded when roaming and taking snapshots at key positions, it can ensure that there will be no terrain penetration at key positions, but if there is terrain occlusion between the front and rear positions (Even if it is a short section, such as the front and rear points are located on the front and back of a certain mountain in a nature reserve, or the front and rear points are located on both sides of the mountain on the bank of a river bend), camera penetration will still occur during the browsing process Terrain, 3D images falling below the surface

Secondly, in order to obtain a better browsing experience in the target area, this method requires professionals who are familiar with the area to manually set the roaming area in advance and record scene snapshots at key locations. When an emergency situation requires automatic roaming in a new area, this method cannot achieve both efficiency and effect

[0009] To sum up, the traditional automatic roaming by path and the combined roaming method of "scene snapshot + perspective transition" cannot well meet the needs of remote sensing monitoring of the ecological environment for convenient regional automatic roaming

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