Method for rapidly constructing 2.5-dimensional building model

Abstract

The invention relates to the technical field of geographic information, in particular to a method for rapidly constructing a 2.5-dimensional building model. The method for rapidly constructing the 2.5-dimensional building model includes the steps that corresponding coordinates of geographical coordinates on a map are calculated by obtaining the feature geographical coordinates and the building height of a building, the height offset direction and the offset distance are determined according to the feature geographical coordinates, the building height and coordinates of an observation point, then the lateral sides and the top side of the building are drawn, and drawing of the map is accordingly completed. Compared with the prior art that a two-dimensional map can not show the sufficient space sense, and although a three-dimensional map can show the sufficient space sense, the size of data needing to be processed is greatly increased, the method for rapidly constructing the 2.5-dimensional building model has the advantages that a three-dimensional image can be displayed on a planar map drawing board, and the data number of image drawing is also decreased.

Description

technical field [0001] The invention relates to the technical field of geographic information, in particular to a fast method for constructing a 2.5-dimensional building model. Background technique [0002] With the rapid development and integration of modern surveying and mapping technology, computer technology, network communication technology and the Internet, applications related to geospatial space are growing rapidly. Indispensable basic information resources. [0003] In related technologies, electronic maps can be divided into two types in terms of their display methods. The first type is a two-dimensional map, and the second type is a three-dimensional map. Electronic map services are mainly two-dimensional maps, which provide spatial positioning and basic query and search functions for building information, and meet people's needs for using geospatial information to a certain extent. The two-dimensional electronic map uses the superimposition of three graphical s...

AI Technical Summary

Problems solved by technology

The two-dimensional electronic map has fast mapping and drawing speed, can provide and meet the query, analysis and management needs of most geographic information products for spatial location, but because of the lack of real world sense of space (no three-dimensional sense), the map The intuitive experience of the product scene is insufficient, and the expression of geographical objects through two-dimensional symbols cannot satisfy people's sense of three-dimensional space cognition, and it is impossible to complete data measurement in three-dimensional space based on two-dimensional maps

However, the 3D electronic map requires the production of a large number of 3D models. Each building is carefully textured according to the collected photos and real rendering is required through 3D software. The amount of data processed is large, the production cycle is long, and the cost is high. Network transmission and model drawing occupy a relatively large amount of resources, which cannot better meet the needs of map applications in the mobile Internet

[0005] To sum up, existing maps cannot reduce the amount of data processed during map drawing while making the map have a sense of space

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