Geometrical shape difference detection method and device for electronic map

A difference detection and geometric shape technology, applied in the field of electronic surveying and mapping, can solve the problems of low efficiency of processing methods, time-consuming spatial indexing, and cumbersome processing, so as to reduce the possibility of missed judgments, simplify the number of comparison operations, and improve efficiency.
CN101403607AActive Publication Date: 2009-04-08NAVINFO
0 Cites 3 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NAVINFO
Publication Date
2009-04-08

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a geometric shape difference detection method and a device of electronic maps, which is used for the geometric shape difference detection of at least two electronic maps. In the method, each event spot is regarded as the current event spot, and the following operating steps are executed: a segment related to the current event spot is selected to form a first segment concourse from all the segments of the two electronic maps; a segment from the first segment concourse is selected to taken as the current segment; the current segment and the second segment concourse are compared to obtain a compared result, the segments of the first segment concourse except the current segment form the second segment concourse, and when the compared result shows no superposition segment is existed between the second segment concourse and the current segment, the current segment is estimated to be a difference segment. The invention reduces the geometric shape difference detection errors of the electronic maps, and the measuring efficiency is improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of electronic surveying and mapping, in particular to a method and device for detecting geometric shape differences of electronic maps. Background technique

[0002] With the accumulation of road data collection results year by year, it is often necessary to compare road vector data of different years to find the changes among them.

[0003] The current solutions to this problem are mainly summarized as the following methods:

[0004] The first method is to use the remote sensing raster data of different years in the same area to calculate the difference between pixels, and connect the result with the existing road vector data to find the geometric changes on the road.

[0005] The second method is to use a road vector map as the background and establish a spatial index, use a certain road in other years to query using the spatial index, and compare the query results with this road one by one to find the di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More