Three-dimensional-map display system

Abstract

To display a three-dimensional map in which planimetric features that cannot be seen, such as underground structures, can be expressed without imparting a sense of incongruity. Among a plurality of planimetric features stored in a map database, underground structures such as tunnels are categorized as transparent objects, and other planimetric features are categorized as non-transparent objects. Furthermore, the transparent objects and the non-transparent objects are respectively and separately projected to generate a transparent-object projection map and a non-transparent-object projection map. The degree of transparency is adjusted and the transparent-object projection map is superimposed upon the resultant non-transparent-object projection map. As a result of making the transparent-object side transparent and superimposing the transparent-object side, a map can be achieved in which a user can seemingly see the transparent objects, and see through the transparent objects to the planimetric features and the ground surface blocked thereby.

Description

technical field [0001] The present invention relates to a three-dimensional map display system capable of displaying a three-dimensional map by expressing unrecognizable features such as underground structures without a sense of incongruity. Background technique [0002] As an electronic map used on a satellite navigation device or a computer screen, there is a three-dimensional map that three-dimensionally represents features such as buildings. A three-dimensional map is generally drawn by projecting, for example, perspective projection of features arranged in a virtual three-dimensional space. Since the three-dimensional map reproduces the state seen from the point of view, there will be blind spots that cannot be visually recognized from the point of view on underground structures such as tunnels or roads behind high-rise buildings. [0003] In order to overcome the influence of blind spots, Patent Document 1 discloses a technique of drawing a tunnel with dashed lines or...

AI Technical Summary

Problems solved by technology

Since the three-dimensional map reproduces the state seen from the point of view, there will be blind spots that cannot be visually recognized from the point of view on underground structures such as tunnels or roads behind high-rise buildings.

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