Representation of Depth Notes on Nautical Charts Based on Character Color Extension

Abstract

The invention discloses a water depth notation method based on character color expansion, which includes the following steps: a. 12 unmeasured bottom symbols and dry out symbols for explaining the water depth notation category through Arabic numerals 0-9 The characters are designed to create a character library for the water depth annotation of the green right oblique isoline body; b. Display and draw the water depth annotation of the green right oblique isoline body through the geographic information system software. The present invention is based on the representation method of sounding notation on the chart based on character color expansion. By adopting the seemingly simple method of expanding the color of the sounding notation, it effectively realizes the two main bathymetric data on the current chart—from single-beam sounding. The difference between deep and multi-beam bathymetric bathymetric data better satisfies chart users in the fields of navigation, marine engineering, and marine fishing. The need to know, reconstruct and utilize the seabed topography, so that the production quality and use value of nautical chart products have been significantly improved.

Description

technical field [0001] The invention relates to the fields of nautical chart drawing, navigation, marine engineering, marine fishing, etc., and in particular relates to a sea chart water depth notation method based on character color expansion. Background technique [0002] With the advancement of bathymetry technology, the relevant survey departments of various countries have basically adopted multi-beam bathymetry equipment in qualified sea areas to achieve full-coverage bathymetry on the seabed. Traditional bathymetry uses single-beam echo sounding The instrument is used for point and line measurement, and the depth data between the sounding lines cannot be obtained. The application of the multi-beam sounding system realizes the surface measurement of the depth, solves the problem of full coverage, and greatly improves the work efficiency. And the reliability of depth measurement, that is to say, compared with the single-beam sounding equipment commonly used in the past, ...

AI Technical Summary

Problems solved by technology

In fact, the water depth data obtained through multi-beam sounding can no longer worry about the phenomenon of "shallow leakage" that may endanger the navigation safety of ships when using old methods such as single-beam sounding. Interpolation calculation of arbitrary density between different water depths, if the characteristics of this water depth data can be displayed intuitively and effectively on the sea chart, it will definitely further improve the use effect of sea charts in various related fields, especially in the navigation field. However, as As pointed out in the previous analysis, at present, the IHO and the relevant countries have not made any comparison between the bathymetric data from multi-beam survey and the bathymetric data from single-beam survey (including those from large-scale oceanographic charts). charts or more accurate bathymetric data obtained by other surveying means), so that chart users cannot take full advantage of the huge advantages brought about by the use of current advanced bathymetry technology, thus reducing the nautical chart to some extent. The overall quality and usefulness of the graph

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