A water depth information display and application method based on ecdis
An application method and information display technology, applied in the field of marine navigation aids, can solve problems such as the danger of ship navigation, the inability to make full use of the water depth resources of the port, and the failure to calculate the position of the ship and the actual water depth of the waters.
Inactive Publication Date: 2017-09-19
DALIAN MARITIME UNIVERSITY
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Problems solved by technology
At present, ECDIS, which is the main navigation aid, does not have the function of calculating the position of the ship and the actual water depth of the water area, which leads to the inability to make full use of the water depth resources of the port and the danger of the ship's navigation.
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[0053] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 2 Shown, the present invention comprises the following steps:
[0054] (1) First extract the position and depth of the sounding point, and obtain the information of the nautical chart and tidal datum;
[0055] In ECDIS, a sounding point is used as an example for calculation. The sounding point is located at longitude 82°35′.5W, latitude 27°44′.6N, and the displayed chart depth is 8.0m. The tidal datum and the chart datum coincide, and there is no correction between the chart datum and the tidal datum.
[0056] (2) Obtain the information of tidal height changes with time at each water depth point
[0057] Using the tidal analysis method to calculate, the tide height y(t) of the water depth point at time t is expressed as:
[0058]
[0059] Use the above formula to calculate the change of tide height with time. Among them, the tide changes at this p...
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The invention discloses an ECDIS-based water depth information display and application method, comprising the following steps: extracting the position and depth of the water depth point on the sea chart, and obtaining the information of the sea chart and the tidal reference plane; obtaining the change of the tide height of each water point with time information; calculate the actual water depth of each sounding point; convert the actual water depth information of each sounding point into graphical identification data of the sounding point that can be expressed on the ECDIS standard base map; add an actual water depth layer that can be selected for display in ECDIS; in the new The layer displays the actual water depth of each water depth point in real time according to the change of computer time; the application calculation is performed according to the actual water depth. The present invention combines tidal information to calculate the actual water depth of the ship's location, and calculates by adding tidal height factors into the calculation of each water depth point, eliminating the error caused by the tidal height between the water depth of the sea chart and the actual water depth, and performing calculations as required And it will be displayed in ECIDS to provide a reference for the decision-making of navigators.
Description
technical field [0001] The invention relates to a marine navigation aid technology, in particular to an ECDIS-based water depth information display and application method. Background technique [0002] Electronic chart display and information system (hereinafter referred to as ECIDS) is a commonly used navigational aid. As a commonly used information, the position of sounding point and its sounding value can be displayed as required. At present, the sounding depth of ECIDS chart follows the common sounding method on navigational charts. The datum adopted is the bathymetric datum, which is taken as the astronomical lowest tidal level or the theoretical lowest tidal level. The water depth displayed in ECDIS is the vertical distance from the bathymetric datum to the sea bottom. [0003] The actual water depth from the sea level to the bottom of the ship is numerically equal to the sum of the water depth on the chart and the tide height. If the nautical chart datum is incons...
Claims
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IPC IPC(8): G06F17/50G01F23/00
Inventor 尹建川王妮妮
Owner DALIAN MARITIME UNIVERSITY