A method for automatically drawing centerlines of navigable areas on inland river electronic charts

Abstract

The invention discloses a method for automatically drawing the center line of a navigable area on an inland river electronic chart, which divides a high-water point set and a low-water point set; obtains the outer boundary according to the high-water point set; obtains the inner boundary according to the low-water point set; Each line segment of the trunk line of the main channel of the Yangtze River is divided into several small segments, and the normal line of the connection point of each segment is obtained; the intersection points of each normal line and the inner and outer boundaries of the navigable area are obtained, and each 2 intersection points are grouped into groups; Take the center point of each group of intersection points of each normal line; connect the center points obtained on each normal line to obtain the centerline of the navigable area. The central line of the navigable area that can be automatically drawn by the present invention is used as the pilot route for the navigation of the ship, which can ensure the safe navigation of the ship more scientifically, effectively and economically.

Description

technical field [0001] The invention relates to the field of navigation drawing, in particular to a method for automatically drawing the center line of a navigable area on an inland river electronic chart, which is suitable for realizing the navigable center line on an inland river electronic chart with massive water depth point data and obtainable skeleton line data of an inland river trunk line. Drawing of the centerline of the navigation area. Background technique [0002] Electronic chart is a modern navigation technology. Generally, all kinds of digital charts and their application systems are collectively referred to as electronic charts. It is another great technological revolution in ship navigation after radar. Its development history has roughly gone through three stages: [0003] 1. The equivalent of paper charts. From the late 1970s to 1984, in order to reduce the size and labor intensity of chart operations, people simply digitized paper charts and stored them...

AI Technical Summary

Problems solved by technology

[0011] The disadvantage of prior art 1 is that the safety of the centerline route of the navigable area completely depends on the driver's accumulated knowledge of the waters in the long-term practice, and it does not have generalizability and universal applicability. The rough estimation of the route to the center line has a large estimation error, which is not the optimal route

[0012] The second shortcoming of the existing technology: Although the center line drawn by it utilizes some data obtained from scientific surveying and mapping and relatively actual water depth information, it generally requires careful, serious, and concentrated identification of water level information, resulting in a large workload and misdrawing Sometimes it is necessary to draw repeatedly, which makes the drawing efficiency very low. Therefore, the safety of the route is affected by large unstable factors, and there is also a large error in the estimation of the center line, which is not the optimal route.

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