Boundary digitizing method of cadastral plot

A technology of cadastral maps and plots, applied in image data processing, maps/plans/charts, image coding, etc., can solve the problems of low degree of automation, heavy workload of human-computer interaction, low efficiency, etc., and achieve strong integrity , reduce the workload of human-computer interaction, and achieve high efficiency

Inactive Publication Date: 2010-09-22
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a method for digitalizing the boundaries of cadastral map plots to s...

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  • Boundary digitizing method of cadastral plot
  • Boundary digitizing method of cadastral plot
  • Boundary digitizing method of cadastral plot

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[0054]In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] When digitizing the screen after scanning input, although the scanning vectorization software can be used to perform vector digitization on the scanned raster image, relatively speaking, some work intensity can be reduced and the operation is easier. However, in actual operation, because the cadastral map contains other kinds of graphic content besides the property boundaries or parcel boundaries, such as change records, identifiers and annotations, etc., the scanning vectorization software cannot selectively identify and Therefore, it is not feasible to directly vectorize scanned raster images with scanning vectorization software.

[0056] Object-based image analysis is a new theory that has emerged in recent years. This an...

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Abstract

The invention provides a boundary digitizing method of a cadastral plot, which comprises the following steps of: input step: inputting the scanning grid image of an existing paper cadastral map; division step: dividing the scanning grid image into a plurality of image objects to be classified; extraction step: building knowledge rules, applying an object-oriented analytic classifying method, and extracting a plot object from a plurality of image objects; vectorization step: vectorising the extracted plot object; and comprehensive summarization step: comprehensively summarizing the outline of the plot object, and finally obtaining the boundary element of the vectorization cadastral plot. The invention is used for solving the problem that the existing cadastral map digitizing method has low automation degree, large man-computer interaction workload and low efficiency.

Description

technical field [0001] The invention relates to the technical fields of cadastral surveying, geographical data acquisition and digital surveying and mapping, in particular to a boundary digitization method of a cadastral map block. Background technique [0002] With the continuous acceleration of urban construction, the appearance of the city has undergone tremendous changes, so the existing paper cadastral maps are extremely inconvenient to use and manage. Therefore, the digitization of the original paper maps and the merging of changed cadastral survey data have become inevitable. [0003] refer to figure 1 , which shows the processing flow of a method for digitizing cadastral maps in the prior art, which may mainly include the following parts: [0004] The first part mainly adopts digital input of online hand-held tracking digitizer or screen digitization after scanning input to digitally collect the required cadastral element data (mainly parcels or plot boundaries) on ...

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Application Information

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IPC IPC(8): G06T9/00G06K9/00G09B29/00
Inventor 谭衢霖胡吉平
Owner BEIJING JIAOTONG UNIV
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