Mixed coloring method in relief shading cartography, and shade map

Abstract

A method for making mixed color lay-on in ground form shaded-relief mapping includes confirming height belt according to lamination color lay-on means in ground form shaded-relief mapping and dividing height range of mapping region to be at least two height belts, using boundary line between flat ground and hilly area as boundary line between two color lay-on modes of graded color lay-on and lamination color lay-on, applying graded color lay-on at hilly area as well as applying lamination color lay-on at flat ground region and sea area.

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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