Thermodynamic diagram generation method and system considering space density difference

Abstract

The invention discloses a thermodynamic diagram generation method and system considering space density difference, and the method comprises the steps: collecting experiment data, and storing the experiment data in a form of a space point group; in combination with a thermodynamic diagram scale, calculating a real distance corresponding to the screen resolution, and taking the real distance as a side length threshold value of quadtree segmentation; counting the number of the spatial point groups, and calculating a point number threshold value; carrying out quadtree segmentation based on point number threshold and side length threshold constraints on the spatial point group, and extracting block side length information reflecting a point group distribution aggregation degree; calculating adaptive bandwidth values point by point according to the corresponding relation between the side length of the quadtree block and the bandwidth parameter of the nearest neighbor kernel density function;and substituting the adaptive bandwidth value into a nearest neighbor kernel density function, calculating a nearest neighbor kernel density function value, and presenting a result in a Heat-map form. According to the method, quadtree segmentation and the nearest neighbor method are combined, the bandwidth values are calculated point by point, and the real distribution characteristics of the spatial point group are expressed more objectively.

Description

technical field [0001] The invention belongs to the technical field of thermal map generation, and in particular relates to a method and system for generating a thermal map in consideration of spatial density differences. Background technique [0002] Heat-map is a visualization method that uses gradient color bands to show the density or frequency of spatial data. It uses warm and cold colors to match the density and sparseness in human mental images, which conforms to the laws of human visual cognition and can avoid The capping problem of traditional map symbols has strong readability, and has been widely used in the expression of spatial point patterns, such as the distribution of crime cases, the expression of crowd gathering, and traffic analysis. [0003] At present, many open source data visualization frameworks based on WebGL, such as Deck.gl, Mapbox, and some geographic information system (GIS) software vendors such as SuperMap, Esri, and MapGIS Both provide interf...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention proposes a thermal map generation method that takes into account the difference in spatial density to solve the problem of affecting the expression of thermal maps due to unreasonable bandwidth settings

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