Acquisition method for watercourse underwater terrain thematic map

Abstract

The invention discloses an acquisition method for a watercourse underwater terrain thematic map. The method comprises the following steps that first, a digital elevation model is created according to TIN data generated by elevation points and contour line data; second, optimizing process is carried out on the digital elevation model obtained in the first step; third, an illumination model is created, and the illumination model is utilized to carry out illumination model process on the digital elevation model optimized in the second step; fourth, model superposition and rendering are carried out, and then displaying is carried out. According to the acquisition method for the watercourse underwater terrain thematic map, the more vivid and intuitive watercourse thematic map with third dimension can be acquired; the variation trend of the watercourse terrain can be intuitively reflected, the availability in actual production is strong, and the appreciation is provided; meanwhile, the drawing efficiency is high, the production cost is low, and batch drawing can be accomplished by a procedure according to thematic map parameters.

Description

technical field [0001] The invention belongs to the technical field of river channel mapping, and the invention relates to a method for acquiring a river channel underwater terrain thematic map. technical background [0002] Thematic maps, also known as special maps, are maps that focus on one or several natural elements or socioeconomic phenomena. The content of the thematic map consists of two parts: ①Thematic content. Natural or socio-economic phenomena and their associated characteristics highlighted on the map. ②Geographic basis. Common map content used to indicate the spatial location and geographical background of thematic elements mainly includes graticules, water systems, boundaries, and residential areas. [0003] The river topography thematic map is a special map that reflects river topography information, highlighting the river topography information. Thematic river topographic maps play an important role in the development and improvement of rivers, flood co...

AI Technical Summary

Problems solved by technology

[0004] The research on the evolution and improvement of the river bed is inseparable from the visualization of the river topography. At present, the river topographic map is used to describe the river channel information. The content and form are single, the expression is not intuitive enough, and the professional requirements are strong. It is very necessary to make a topographic map with good visualization effect to show the topographic changes of the river bed and the changing trend of the river topography.

However, in the prior art, this aspect is still very lacking.

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