Three-dimensional terrain map and its making method

Abstract

The present invention aims to provide a three-dimensional terrain map and its production method. The map of the invention can solve the problem that the red map cannot clearly judge the elevation fluctuation and cannot grasp the terrain elevation distribution. The method of the present invention includes performing terrain slope calculation and terrain openness calculation on the numerical terrain model, and color-grading the terrain slope and openness with a three-dimensional chroma color scale to obtain a three-dimensional topographic map.

Description

technical field [0001] The present invention relates to a topographic map and its production method, in particular to a three-dimensional topographic map with chroma and color scale and a production method thereof. Background technique [0002] In recent years, in terms of light detection and ranging (LiDAR) technology, it has been able to produce high-precision digital surface model (DSM) and digital elevation model (Digital Elevation Model, DEM), and its accuracy can even reach If this technology can be used in soil and water conservation, soil and sand disaster prevention, land planning, disaster prevention management, environmental monitoring and resource exploration, it will be of great help. However, if the DSM and DEM are represented by traditional methods such as contour lines, shading, or layered coloring, important information will be missed because the map cannot fully represent the topography. Take Miaoli Huoyanshan DSM as an example (see Figure 1a , 1b ) (Reg...

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Problems solved by technology

layered tinting map ( Figure 1b ) can only simply judge the elevation change but cannot directly observe the terrain type

While the shadow map ( Figure 2a , 2b ) can express the terrain characteristics of gully erosion, but it has many disadvantages, such as the shadow itself will cover the finer terrain, and the opposite direction of the incident light source will cause misjudgment of the terrain's unevenness, resulting in the inability to fully present the real terrain.

[0003] Someone in the industry proposed a technical solution for a red map. References: TWI285852, JP4272146, JP3670274, JP5281518, CN17115688, CN102214410A, USP7876319, USP7764282 and other cases. Form a red map with elevation values. Although the above case can solve the aforementioned problems, the judgment of elevation fluctuations is not very clear, and the elevation distribution of the terrain cannot be grasped, so the effect is not ideal

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