A method of drawing multi-beam tone scale based on qt framework

Abstract

The invention discloses a multi-beam color gradation diagram drawing method based on a QT framework. The method adopts a high-precision three-dimensional space measurement technology calculation and alayer splicing technology for processing, a client introduces the multi-beam data according to a map position, according to the latitude and longitude and the topographic water depth data, the X- andY-values in the three-dimensional geometric space are used to calculate the equilateral triangle, in the three-dimensional space, the latitude and longitude points are sorted, a traversal technologyin java is used, each set is traversed into a two-dimensional array in three-dimensional space, that is, X and Y values, a plurality of regular triangles is subjected to traversal calculating, and themethod traverses all the arrays to find the minimum distance of the array, performs sequential splicing, and finally forms a multi-beam layer. The method reduces the dependence degree of the two-dimensional plan drawing on the map proportion and the limitation of the spatial axis direction, and realizes equipment versatility; and the method is fast and easy to understand, can be used on limited hardware support, reduces the dependence on graphics card GPU, and is adapted to a variety of graphics card types.

Description

technical field [0001] The invention relates to the technical field of map drawing, in particular to a method for drawing multi-beam color scale maps based on a QT framework. Background technique [0002] Since the early 1990s, the country has paid more and more attention to marine resources, and under the circumstances that the management needs of marine peripheral resources have become increasingly severe, the task of submarine cable construction has been highlighted. The construction of submarine cables in the vast sea area of ​​the South China Sea and its Management is the primary task at this stage. Therefore, based on the topographic data of the South China Sea, it integrates various survey information such as submarine features, submarine cable routing, and the environment, so as to be closer to the actual situation. In order to meet the needs of offshore channels, ocean surveys, continental shelf surveys, and submarine cable laying, a large number of multi-beam sound...

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