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Nautical chart isobath simplification safety assessment method

A technology of isobath and nautical chart, applied in the field of safety assessment of depth line simplification

Active Publication Date: 2018-01-09
PLA DALIAN NAVAL ACADEMY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In long-term practice, the safety assessment of the simplification of the contour of the nautical chart mainly relies on a qualitative empirical analysis conducted by the nautical chart cartographer through manual visual interpretation. There is no public literature that can quantitatively evaluate the Security of Graph Contour Simplification

Method used

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  • Nautical chart isobath simplification safety assessment method
  • Nautical chart isobath simplification safety assessment method
  • Nautical chart isobath simplification safety assessment method

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Embodiment Construction

[0023] The realization process of the present invention is to use a computer to realize the safety assessment of the simplification of the isobath of the nautical chart. Suppose a certain isobath before simplification on the nautical chart and its corresponding simplified isobaths , using the method of the present invention to evaluate the safety of the simplification of the contour of the nautical chart, including the following steps, such as image 3 Shown:

[0024] Step a, read in the isobaths before simplification on the chart on all nodes , ,..., plane position ( );

[0025] Step b, from isobaths before simplification the first point of start, along the isobath direction to end point , to judge the relationship between the depth value of the sounding points near both sides of the isobath and the depth value of the isobath, the depth value of the sounding point on one side of the isobath should be less than (or equal to) the depth value of the isoba...

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Abstract

The invention relates to a nautical chart isobath simplification safety assessment method comprising the following steps: reading plane positions of all nodes on a pre-simplified isobath of the nautical chart; determining a shoal water zone and a deepwater zone of the pre-simplified isobath according to water depth noted values of two sides of the pre-simplified isobath of the nautical chart; reading the plane positions of all nodes of the corresponding simplified isobath on the nautical chart; using space analysis to obtain the depth expansion sections of the simplified isobath in the deepwater zone; building one or more depth expansion areas formed by the depth expansion sections crossing with the pre-simplified isobath; respectively calculating the total length of the simplified isobath, the total length of the depth expansion sections, and the total area of the depth expansion areas; calculating an isobath simplification depth expansion length percentage and an average depth expansion distance, and using the two indexes to quantitatively assess the nautical chart isobath simplification safety.

Description

technical field [0001] The invention relates to the technical field of marine surveying and mapping, in particular to a safety assessment method for simplification of isobaths of nautical charts. Background technique [0002] Isobath refers to a smooth curve connecting adjacent points of equal seabed depth calculated from the theoretical depth datum, that is, a closed curve passing through points of the same water depth. On nautical charts, isobaths play a very important role in ensuring navigation safety, accurately reflecting the navigability of waterways, and reasonably displaying seabed landforms. [0003] The most critical requirement for the simplification of isobaths on nautical charts is to meet the navigational safety criteria. In the simplification process of the isobath of the nautical chart, in order to maintain the clarity of the map, it is necessary to delete the small bends on the isobath, and at the same time, it must be able to ensure the safe navigation of...

Claims

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Application Information

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IPC IPC(8): G06T7/543G06T7/62
Inventor 张立华贾帅东
Owner PLA DALIAN NAVAL ACADEMY
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