Method for importing high-capacity VCT file into spatial database

Abstract

The invention discloses a method for importing a high-capacity VCT file into a spatial database, and the basic idea of the method comprises the steps: an index table for recording element target identification codes, element types, spatial geometric data storage line numbers and attribute storage line numbers is established before the VCT file is imported; when the VCT file import is executed, onecopy is copied from the VCT file, the original file and the copy are opened at the same time, then data are read and analyzed from the two files according to the geometric data storage line number and the attribute storage line number of the element by traversing the index table, and an analysis result is written into the spatial database together. According to the invention, the problem that a large-capacity VCT file is limited by a memory when being imported into spatial data can be thoroughly solved; the risk of low data exchange efficiency caused by storage characteristic difference between a VCT file and a general spatial geographic database is effectively avoided, a reliable and efficient method is provided for actual data conversion work, and the method has important practical significance in application of a geographic information system.

Description

technical field [0001] The invention belongs to the field of geographic information system (GIS) data exchange, and in particular relates to a method for importing a large-capacity VCT file into a spatial database. Background technique [0002] The national standard "GB / T 17798-2007 Geospatial Data Exchange Format" stipulates that the vector data file used for data exchange between geographic information systems is called a VCT file, the suffix is ​​*.vct, and the spatial data is stored in a VCT in plain text. in the file. [0003] The content stored in the VCT file can be divided into eight parts, as attached figure 1 As shown, including: 1) Describe the basic information of the data, such as the file header of the data range, coordinate dimension, and mathematical basic information; 2) Define the element type parameters of the spatial data classification included; 3) Define the structure of the attribute data; 4 ) Spatial geometry data; 5) Annotation data; 6) Topological...

AI Technical Summary

Problems solved by technology

[0009] The second idea can effectively reduce the time consumption of performing database query operations, but requires a large amount of memory as a temporary storage area for elements

After testing, when the file exceeds 600M, using this method to import the VCT file will cause an abnormal situation of memory overflow

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