Patent
Accelerating method for two-dimensional map library
Yang Feng,Tian Ze,Zhang Shaofeng,Zhao Bin,Wang Qihui,Jiang Liyun +5 more
- 20 Apr 2016
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TL;DR: In this paper, an index data model of multiple layers of grids with graded elements is established, and required grids are selected according to the range of map data displayed in a screen; the map data in the selected grids are clipped according to screen display range; 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.
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Abstract: 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.
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Citations
Patent
Discrete site graded display method and device based on GIS (geographic information system)
Dai Liwei
- 22 Dec 2017
TL;DR: In this article, a discrete site graded display method based on a GIS (geographic information system) is proposed, which includes the steps of S1, acquiring the range of a current map according to input longitude and latitude point arrays and a loaded map grade; S2, cutting a region in the map range into grids according to the map grade.
1
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Wei Zang
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6
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TL;DR: In this paper, the authors proposed a method and a device for automatically generalizing map space points, which can solve the problem of map contracted compilation well and ensure that data on one scale can be applied to the maps with other scales.
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Patent
Method for realizing large-scale dynamic target visualization by utilizing grids under real-time environment
Zhang Peng,Chen Qiong +1 more
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