Method for dynamically presenting two-dimensional spatial data by using color mapping technology in scalable vector graphics (SVG)

Abstract

The invention provides a method for dynamically presenting two-dimensional spatial data by using a color mapping technology in SVG. The method comprises the steps of visiting an SVG document and newly creating a blank canvas; if a concerned space range is not the whole SVG plane, newly creating a clipping path which serves as a shade that is applied to the canvas; setting grid spacing parameters in a transverse direction and a longitudinal direction, and calculating coordinates, widths and heights of all grid rectangles; collecting scalar data of t period of n points in a two-dimensional space; using a spatial interpolation algorithm to calculate scalar values of central points of all grid rectangles; using the color mapping technology to map scalar values of central points of all grid rectangles as specific colors; if t=1, creating all grid rectangles sequentially on the canvas and filling colors corresponding to scalar values; if t>1, changing filling colors of all grid rectangles into the color corresponding to the current scalar value sequentially; and if the period to be displayed exists, enabling t to be equal to t+1, and returning to S4 to display data of the next period. The method is low in development difficulty, high in development efficiency and high in practicability.

Description

technical field [0001] The invention relates to the field of computer applications, and in particular provides a method for dynamically displaying two-dimensional spatial data using color mapping technology in SVG (Scalable Vector Graphics, scalable vector graphics). Background technique [0002] Spatial data refers to the data used to represent the position, shape, size, and distribution characteristics of spatial entities. It is related to both space and time. It exists widely in many disciplines such as geography, meteorology, electricity, and architecture. . A common form of spatial data is a scalar field. The attributes of each point in the scalar field space can be represented by a single value (scalar). In the two-dimensional space of the Cartesian coordinate system, the value of a point in the scalar field can be expressed as (x, y, v t ), where the subscript t indicates that the scalar field changes with time, that is, the time-varying scalar field. [0003] With...

AI Technical Summary

Problems solved by technology

However, there is still no case of using color mapping technology to dynamically display spatial data in SVG, and the excellent features, rapid development, and strong scalability of SVG have not been fully utilized.

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