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Method and device for smoothing terrain data
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A technology for smoothing and terrain data, applied in the field of image processing, can solve problems such as data destruction, and achieve the effect of reducing destruction, improving accuracy, and multi-important information technology effects.
Inactive Publication Date: 2019-08-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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[0005] The embodiment of the present application provides a method and device for smoothing terrain data, which solves the problem of smoothing terrain data in the prior art. Most of them are implemented based on interpolation methods, and there is a technical problem of serious data damage.
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Embodiment 1
[0070] like figure 1 As shown, the present embodiment provides a method for smoothing terrain data, including:
[0071] Step S101: Randomly select a vertex from the terrain raster data as the first vertex, where the first vertex is the vertex that needs to be smoothed currently.
[0072] For example, topographic raster data may be extracted from a raster image that needs to be smoothed, and any vertex may be arbitrarily selected from the topographic raster data as the first vertex, and denoted as a.
[0073] Step S102: Determine the first vertex element corresponding to the first vertex.
[0074] As an optional embodiment, step S102 includes: selecting four vertices around the first vertex; wherein, the first vertex and these four vertices constitute a first vertex element, and the first vertex is the center of the first vertex element point.
[0075] For example, four vertices around vertex a can be selected and recorded as N, E, W, S in the clockwise direction, vertex a a...
Embodiment 2
[0105] like figure 2 As shown, the present embodiment provides a device for smoothing terrain data, including:
[0106] The selection module 201 is used to arbitrarily select a vertex from the terrain raster data as the first vertex, wherein the first vertex is the vertex that currently needs to be smoothed;
[0107] A first determining module 202, configured to determine a first vertex element corresponding to the first vertex;
[0108] The first calculation module 203 is used to calculate the normal vector of the first vertex element;
[0109] The second determining module 204 is configured to determine a local terrain around the first vertex element;
[0110] The second calculation module 205 is used to calculate the normal vector of the local terrain;
[0111] The correction module 206 is configured to correct the elevation value of the first vertex based on the normal vector of the first vertex element and the normal vector of the local terrain.
[0112] As an option...
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Abstract
The invention discloses a method for smoothingterrain data, which includes: arbitrarily selecting a vertex from terrainraster data as a first vertex, wherein the first vertex is the vertex that currently needs to be smoothed; determining The first vertex element corresponding to the first vertex; calculate the normal vector of the first vertex element; determine a local terrain around the first vertex element; calculate the normal vector of the local terrain; based on the first vertex The normal vector of the element and the normal vector of the local terrain are used to correct the elevation value of the first vertex. The present invention solves the technical problem of serious data damage in the smoothingprocessing method of terrain data in the prior art. At the same time, the invention also discloses a device for smoothing terrain data.
Description
technical field [0001] The invention relates to the technical field of image processing, in particular to a method and device for smoothing terrain data. Background technique [0002] Terrain is one of the most complex scenes in nature, and its real-time and realistic three-dimensional construction and visualization has always been an important research content of computer graphics. It is used in games such as large-scale three-dimensional games (such as: "World of Warcraft"), virtual games (such as: virtual Forbidden City), film and television animation design, three-dimensional visualizationgeographic information system (such as: "ArcGIS" suite), and national defense and military fields including battlefield environments Situation simulation, combat tactics simulation exercises and other fields have a wide range of applications. At present, the construction of 3D terrain can determine the selection of model details by combining the position of the observation point, so a...
Claims
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Application Information
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