Method using multi-scale line element map to make synthetically drawing

Abstract

The invention discloses a method using a multi-scale line element map to make synthetically drawing; the method comprises the following steps: using an updated large scale map to fast update a non-updated small scale map, wherein the coordinate reference systems of the two original maps are unified, and elements are matched; merging the two maps according to the matching result, keeping the small scale map elements that successfully match with the large scale map, keeping all large scale map elements that cannot match with corresponding elements on the small scale map, simplifying and shortening with equal proportions; finally merging to one map layer, and forming a new map. The new map is complete in elements and small in storage space, and the consistent with the original small scale map in scales; the method can fully utilize updated maps in an existing basic geography information database to fast update and improve non-updated small scale maps, thus parsing spaces, and fast obtaining more accurate analysis results.

Description

technical field [0001] The method of the invention belongs to the field of computer cartography, and in particular relates to comprehensive cartography using line element maps of different scales. Background technique [0002] Small-scale maps are usually used for spatial analysis because of their fast calculation speed, but due to the degree of expression at the corresponding scale, some important elements are missing, resulting in inaccurate analysis results. Therefore, it is necessary to synthesize large-scale maps and improve small-scale maps. element integrity. [0003] The key technology of comprehensive cartography using multi-scale line feature maps lies in data matching and data merging. Scholars at home and abroad have done a lot of related research on multi-scale vector data matching, but there are few studies on multi-scale vector data update. In 2007, Fu Zhongliang et al. proposed a multi-scale spatial database update scheme based on the CHT_EUR spatial databas...

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Problems solved by technology

[0002] Small-scale maps are usually used for spatial analysis because of their fast calculation speed, but due to the degree of expression at the corresponding scale, some important elements are missing, resulting in inaccurate analysis results. Therefore, it is necessary to synthesize large-scale maps and improve small-scale maps. element integrity

[0003] The key technology for comprehensive cartography using multi-scale line feature maps lies in data matching and data merging. Scholars at home and abroad have done a lot of related research on the matching of multi-scale vector data, but there are few studies on the update of multi-scale vector data.

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