Method for extracting complex window space information in space data engine
A spatial data engine and information extraction technology, which is applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of slow client and server response, difficult to meet applications, low efficiency, etc. The effect of broken reorganization, fast operation speed, and simplified complexity
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[0043] The present invention is described in detail below according to accompanying drawing, purpose and effect of the present invention will become more apparent, figure 1 It is a flowchart of the method of the present invention.
[0044] In the spatial data engine, the window can be a general regular or irregular polygon drawn on the client, or a polygonal layer obtained through basic query and filtering in the database. The principle of spatial information extraction is the same, and the present invention Use the polygon layer in the database as the basic information extraction window.
[0045] The complex window spatial information extraction method in the spatial data engine of the present invention comprises the following steps:
[0046] a. Aiming at the line data table and the polygon data table in the database, construct respective auxiliary tables;
[0047] Among them, the method of constructing the auxiliary table of the line data table is as follows: read the line...
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