Method for realizing gathering and scattering visualization of mass ground object mark points through layered grid division

Abstract

The invention discloses a method for realizing gathering and scattering visualization of mass surface feature mark points through layered grid division. The method comprises: acquiring the current zoom ratio of a map, a preset gathering and scattering hierarchy calculation rule is combined to determine whether gathering display or scattering display is currently carried out, and the scattering display execution step comprises the steps of obtaining a corresponding longitude and latitude range on the map according to pixel coordinates of a visual display area; according to the latitude and longitude range, inquiring the dynamic index to obtain marker information in the latitude and longitude range; screening the marker information by using a grid filtering algorithm according to a backwardfirst-in first-out principle; and rendering the screened marker information to a map by adopting a coordinate transformation algorithm for scattered display. According to the method, the display efficiency of mass data on the map can be improved, the identification degree of scattered display of mass points is improved, and map interactive query is achieved.

Description

technical field [0001] The invention belongs to the technical field of digital maps, and in particular relates to a layered grid division to realize a visualization method for gathering and dispersing massive ground object marker points. Background technique [0002] With the advent of the era of big data, digital map technology is also innovating in related application fields, and map visualization of massive data has emerged as the times require. The map visualization of massive data refers to displaying a large number of map markers (ground feature markers) in a limited digital map display area, usually on the computer screen, in the browser window, when the map zoom level is high, the scale It is very large, and it is difficult to display a large number of map markers. Generally, point aggregation is used. However, when the map zoom level is very low, specific map markers need to be displayed in a scattered manner. [0003] Currently, many map providers have somewhat ag...

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Problems solved by technology

[0004] However, the above-mentioned aggregation algorithm needs to calculate and aggregate all the points one by one. For massive points (millions, billions), the calculation efficiency is greatly reduced, and the lack of a hierarchical processing mechanism for massive points can easily cause the load capacity of the browser to be exceeded. , the consequences of the front-end page being stuck

There is also the dispersion of aggregation points, the lack of a corresponding filtering mechanism, and the phenomenon of icon stacking cannot be avoided. In addition, due to the limitation of map providers, it is impossible to provide a solution for point aggregation and dispersion applicable to maps of various coordinate system types.

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