Geographic thematic map online rapid generation method based on pixel coordinate conversion

Abstract

The invention provides a geographic thematic map on-line rapid generation method based on pixel coordinate conversion, which comprises the following steps of: directly connecting a database where a cartographic data source is located through an on-line calculation method, and requesting required cartographic data from the database through a network request mode; adopting a pixel coordinate conversion algorithm for the obtained cartographic data, and obtaining a base map position, a data position and each cartographic element coordinate of the map through calculation; calculating the range of a map screen according to the size of paper needing to be output actually, and integrating the positions and sizes of a proportional scale and a data picture frame; and according to the obtained base map position, the data position, the position of each mapping element and the obtained map screen range, integrating the positions and sizes of a proportional scale and a data picture frame, and adopting a back-end mapping API to complete the geographic thematic map made by the obtained mapping data. The method has the advantages that daily work requirements of business personnel are met, the cost is greatly saved, drawing is simple, and the precision is high.

Description

technical field [0001] The invention relates to the field of map drawing, in particular to a method for quickly generating online geographic thematic maps based on pixel coordinate conversion. Background technique [0002] Geographical thematic maps are an important carrier for the expression and dissemination of geographic information, and an important tool for people to understand natural resources. The traditional thematic map compilation is a complex and rigorous process. The compilation process includes data analysis, purpose principle design, base map drawing, proofreading and printing, etc. It requires extensive professional knowledge and cartographic experience. Difficulties in processes and updates prevent map production efficiency in the cartographic industry. With the advent of the intelligent information age, the field of surveying and mapping is also developing continuously. The traditional thematic mapping technology has been unable to meet people's needs for ...

AI Technical Summary

Problems solved by technology

[0004] However, the focus of the current online mapping technology is still to enable users to browse geographic information and obtain data and functional services in different browser clients. However, there are still problems in the output of online thematic mapping, such as rough mapping accuracy, low mapping efficiency, and Problems such as the misalignment of cartographic elements, in order to truly meet the online customization and multi-user coordination of thematic maps in different industry backgrounds, the current technological breakthroughs still face many challenges

Images