Regional control processing method based on tile map data

Abstract

The invention provides an area control processing method based on tile map data, and the method comprises a cache unit for acquiring tile map pictures and boundary data and constructing boundary data cache to form a cache boundary; a processing unit which is used for forming a control picture of the visible area according to the cache boundary; and a fusion unit which is used for fusing the control picture and the tile map picture to form a covered picture and sending the covered picture to an application terminal for display. The cache unit is used for preprocessing boundary data and constructing a two-stage cache mode; the processing unit correspondingly comprises two-stage processing; the fusion unit outputs a final display picture; the invention has the beneficial effects that data of map pictures can be directly processed by utilizing the method disclosed by the invention, and an original GIS service platform does not need to be transformed and is easy to integrate; on the basis of a two-stage cache mode, the requirement of quickly identifying the covered area in the processing process is met, and the map picture subjected to area covering is outputted.

Description

technical field [0001] The invention relates to the field of map data processing, in particular to an area control processing method based on tile map data. Background technique [0002] In the context of geographic information system applications, spatial data is often classified according to the source and use of the data to construct feature classes, and the GIS service platform is used to publish it as a map service for external sharing and application. Tile map data is the output result of map service protocols, such as OGCWMS protocol and MapService protocol, all of which have the implementation of the above interfaces, and are relatively mature in the field of WebGIS applications. [0003] A map tile is actually a rectangular image, which contains spatial data within a geographical range, that is, under the GIS coordinate system, the rectangular image has four basic attributes: xmin, ymin, xmax, and ymax. Defined as the Envelope of the map range rectangle. [0004] ...

AI Technical Summary

Problems solved by technology

[0005] There are generally two processing methods in the existing technical solutions. One is to implement in the application terminal, and place a cover graphic in the map container of the terminal as the top layer to achieve the occlusion effect; however, adding a cover layer to the application terminal only Realize visual data coverage, but the actual data is still transmitted to the application terminal through the network, the transmission efficiency is slow, and the purpose of actual data control cannot be achieved, and all data transmission to the application terminal also has certain security risks;

[0006] Another way is through server-side processing, by reading the original data of the boundary polygon of the area, and combining the spatial data contained in the map service for spatial topology processing to obtain the output result; this method does not perform resolution-based boundary data Processing, each processing flow will read the original boundary data from the database, which increases the database reading pressure and computational complexity

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