The invention belongs to the technical field of geographic map drawing, and particularly relates to a system for downsizing a multi-scale geographic map in a spatial information database, wherein the system comprises a server system and a client side system; the client side system is used for displaying a release geographic map; the server system comprises a geographic map database, a spatial database, a temporary database, a database system, an integrated geographic map processing database construction module, a full automatic downsizing module, a semi-automatic downsizing module, a basic geographic information module and the like; in addition, graph data stored in the database system is downsized and exchanged through an API (Application Programming Interface), wherein the data updating and the releasing to client side system are performed. The system ends the history that a series of scale geographic maps only depend on traditional surveying and mapping or digitized map compilation, overturns the traditional graphics (map sheets) downsizing technical ideas and methods, leads the map drawing to obtain a qualitative leap, has the advantages of low cost, high speed, high accuracy, strong universality and map feeding according to needs, and achieves wide social popularization and application value.

System for downsizing multi-scale geographic map in spatial information database

The invention discloses an automatic initial scale map making method based on space distribution of a road network, and belongs to the technical field of digital maps, location-based services, and geographic information. The automatic initial scale map making method based on space distribution of the road network is mainly used for achieving the purposes that in the generation process of a digital map, a reasonable initial scale is automatically selected according to the density degree of space distribution of the road network of the current position, and the digital map is output. The automatic initial scale map making method based on space distribution of the road network comprises the steps of calculating indexes of space distribution of the road network, building a functional relation between space distribution of the road network and the reasonable initial scale, and outputting the automatic initial scale map. According to the automatic initial scale map making method based on space distribution of the road network, firstly, control points and interest points of the road network are extracted on the basis of a hierarchical display model, then, a Delaunay triangulation network is generated and is stored, a functional relation between space distribution of the road network and initial map scales is built by collecting sample data of reasonable initial map scales selected by users at different positions, and initial reading scales are automatically selected for the users through the functional relation according to the indexes of space distribution of the road network of the positions of the users.

Automatic initial scale map making method based on space distribution of road network

Plane figure relation determining method and system in geographical information system

The invention relates to an accelerating method for a two-dimensional map library. The method comprises steps as follows: 1) map data are read; 2) an index data model of multiple layers of grids with graded elements is established; 3) required grids are selected according to the range of map data displayed in a screen; 4) the map data in the selected grids are clipped according to the screen display range; 5) the distance between two points of the clipped map data is judged, and a point with the value smaller than a fixed value is discarded; 6) a display map is drawn. By means of the method, the display speed of maps can be increased.

Accelerating method for two-dimensional map library

The invention provides a method and a device for automatically generalizing map space points. The method comprises: step 1, looking up two map space points the nearest on a point map layer; step 2, deleting one of the two map space points which is the nearest to the other map space points; and step 3, repeatedly executing two previous steps till the distance between the two map space points obtained in the step 1 is greater than a preset tolerance value so as to obtain a new point map layer consisting of the remaining map space points. As the process of looking up and deleting the map space point does not need manual intervention of users, work efficiency is greatly improved. The method and the device can automatically generalize the map space points under various distribution laws in various types of map application so as to solve the problem of map contracted compilation well and ensure that data on one scale can be applied to the maps with other scales.

Method and device for automatically generalizing map spatial points

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Method and device for automatically generalizing map spatial points