Mixed coloring method in relief shading cartography, and shade map

Abstract

The invention relates to a mixed coloring method for geomorphic shading mapping and a map obtained by the method. The method includes the following steps: (1) determining the elevation section according to the layered coloring method in the topography shading, and dividing the elevation range of the mapping area into two or more elevation sections; (2) dividing the boundary between the flat land and the mountain The line or the coastline is used as the boundary between the two coloring modes of gradient coloring and layered coloring. Gradient coloring is used in mountainous areas, and layered coloring is used in flat areas and sea areas. The method of the present invention is simple, and it is convenient for the computer to process the mapping process of topography shading. According to this method, it is possible to design a topography shading map that has the advantages of gradient coloring and layered coloring at the same time, and avoids their respective shortcomings, and can obtain delicate and vivid , The quality of the shaded product with clear layers, the effect is obvious. Whether it is used as a base map of an ordinary map or a separate map, it can make map readers easy to recognize the topographic features of the mapping area, and enhance the aesthetics and readability of the map.

Description

technical field [0001] The invention discloses a mixed coloring method and a map expression form for geomorphic shading mapping. More specifically, the present invention relates to an expressive ability and a method for improving the three-dimensional effect of map shade rendering. Background technique [0002] Shaded topography is a map product that expresses the three-dimensional effect of the topography and shows the undulating shape of the topography based on the intensity of the shadows produced by the assumed light source on the ground. Its drawing method is to simulate the intensity of shadow and the degree of light and darkness produced by the light source on the ground by controlling the illumination model and the position of the light source, and project it onto the plane to achieve the effect of simulating the undulation of the landform, forming a shaded image with shadows and light and dark changes. [0003] Layered coloring method refers to layering and segment...

AI Technical Summary

Problems solved by technology

[0003] Layered coloring method refers to layering and segmenting the elevation according to the different ground elevations, and assigning different colors to each layer. The characteristic of this method is that it can strictly distinguish each elevation section, and the layers are clear. The disadvantage is that the effect of the drawing is not good. exquisite

[0004] The gradient coloring method is a coloring method based on the principle of shade rendering to express a three-dimensional effect. Specifically, it refers to setting the color of each dividing line on the basis of layers according to the difference in ground elevation, and using the interpolation method according to the upper and lower dividing lines. The color of each elevation is obtained by color. The feature of this method is that it can make the color transition between different elevations natural, and the picture effect produced is more delicate and vivid than layered coloring. However, this method blurs the boundaries between various elevations, making it difficult to distinguish Areas with small height differences are not conducive to expressing the gradient and layering of terrain;

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