Map data simplifying method oriented to mobile equipment
A technology for map data and mobile devices, which is used in electrical digital data processing, special data processing applications, instruments, etc. It can solve the problem of large amount of map data transmitted, and achieve the effect of high rendering performance and small data amount.
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[0062] The implementation steps of this invention are further introduced through an example of map data reduction. The original map data is the map data of the whole area of Beijing in GML format. The specific original data is shown in Table 1.
[0063] Adopt the present invention to streamline raw data as follows:
[0064] (1) Grading. Here only the map data is divided into two levels, Level1 and Level0. Level0 entities come from the following layers: land use (including green land and water), administrative landmarks, and main roads in the road layer (here, the meaning of main roads is: the attribute value of the road level is "highway" or "street" , and the width of the road is greater than 20m); Level1 entities come from the following layers: plots, land use (including green land and water), administrative landmarks, general landmarks, roads and POIs.
[0065] (2) Use the line smoothing algorithm to simplify the geometric properties of the entity. The simplified para...
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