A water depth annotation precision quantitative evaluation method for a non-autonomous surveying and mapping sea chart

Abstract

The invention relates to a water depth annotation precision quantitative evaluation method for a non-autonomous surveying and mapping sea chart, and the method comprises the following steps: reading all water depth points on the non-autonomous surveying and mapping sea chart to be evaluated, and building a Delaunay water depth triangulation network through a point-by-point insertion method; analyzing whether the depth value of each water depth point is smaller than the depth values of all the adjacent water depth points or not, and whether the water depth point is the local shallowest point ofthe submarine topography surface or not is judged; extracting all local shallowest points in the water depth points, and judging whether each local shallowest point is a special water depth point ornot by calculating the gradient of each local shallowest point; establishing a special water depth point set of the to-be-evaluated chart; establishing a circular region of each special water depth point by taking the position of each special water depth point on the to-be-evaluated chart as a circle center and taking the corresponding maximum distance of the depth value in the'navigation chart compiling specification 'as a radius; And reading all water depth points on the high-precision chart for inspection and comparison.

Description

Technical field [0001] The invention relates to the field of marine surveying and mapping, and in particular to a method for quantitatively evaluating the accuracy of water depth annotation of non-autonomous surveying and mapping sea charts. Background technique [0002] Water depth, as the most basic element on the chart, plays a very important role in ensuring the safety of ships, reflecting the navigability of the sea area, and correctly displaying the topography and topography of the seabed. Its quality is the key to determining the value of the chart, and even its usefulness. . [0003] The quality of chart data has always been one of the focuses of the marine surveying and mapping community. The International Hydrographic Organization always emphasizes fast and complete chart products and reliable chart data acquisition that covers the world. In recent years, the quality control and evaluation of nautical chart products has also attracted widespread attention from many scho...

AI Technical Summary

Problems solved by technology

Since it is difficult to control the data quality of non-independently collected and produced foreign-version charts in my country, the quality control system of "three-level review and first-level acceptance" adopted in the process of traditional chart drawing is very important in evaluating non-independent surveying and mapping charts. Difficult to apply when graph quality

At present, for the quality assessment of this kind of charts, it is necessary for the cartographers to simply divide the external version of charts into basic data, supplementary data and reference materials based on their data sources, current situation and other information, combined with their own mapping experience. This method of qualitative evaluation of the quality of foreign version nautical charts is limited by the professional ability and experience of the cartographers, and the final evaluation results are difficult to be unique, and its accuracy cannot be guaranteed.

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