Tile map data organization method

Abstract

The invention relates to a tile map data organization method based on a nested pyramid model, belonging to the technical field of visualization of geographical spatial information. Additional similar models are penetrated into the existing pyramid model, wherein the ratio of line number to column number of sliced tiles of each layer is a constant, the magnification setting among layers is the same, the line number and the column number of the tiles of the first stage present an arithmetic progression relationship, so that a nested pyramid model with more compact dimensional transition is constructed. By laying emphasis on the reasonable setting of the dimensions of interpolation maps, the invention adopts a more exquisite and reasonable map dimension dividing manner to increase the dimension distribution density of spatial data, thereby preventing ground objects from being transited in an unsmooth way at the primary stage of dimension pull-down caused by the use of 2X magnification incase of organizing spatial data of small spanning dimensions, and preserving a spanning space for the detailed transition at the later stage. The invention is an improvement on the existing tile map data organization method, and is especially applicable to the organization of spatial data of small spanning dimensions.

Description

technical field [0001] The invention belongs to the technical field of geospatial information visualization, in particular to an improved tile map data organization method. Background technique [0002] At present, it is quite popular to use the raster data organization method to construct electronic maps, especially the tile map data organization form based on the idea of ​​pre-generation is widely used in various network electronic maps, such as GoogleMap abroad, 51ditu, Mapbar in China , Mapabc, E City...the core idea is to sacrifice a lot of preprocessing time in exchange for the greatest gain in the user's visual space. It can be seen that the final visualization effect mainly depends on the preprocessing results of multi-scale spatial data at various levels, and its core is still the multi-scale transformation and expression of data. [0003] The multi-scale expression of spatial data has always been a hot topic in 3S discussion. Regarding the concept of scale, Motte...

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Problems solved by technology

[0014] 2) The second property is no longer applicable, because the data is obtained through synthesis, so the scale between adjacent levels needs to be comprehensively quantified from various aspects such as scale, breadth, and granularity, and cannot be directly determined based on the double step size of resampling

[0033] (1) The speed of change between levels 1-3 is too fast, and it is easy to miss important map element information;

[0034] (2) 4-6 levels of ground object details are close to the most detailed level of the LOD model, often resulting in great information redundancy

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