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Conversion method of DNC (Digital Nautical Chart) and ENC (Electronic Nautical Chart) data models

A technology of data model and conversion method, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of inconvenient application, low conversion rate, poor conversion effect, etc., to achieve correct conversion, conversion rate improvement, design reasonable effect

Inactive Publication Date: 2012-08-01
THE CHINESE PEOPLES LIBERATION ARMY 92859 TROOPS
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Problems solved by technology

In the process of ship navigation at sea, two data models are often used at the same time, which brings inconvenience to the application, so it is necessary to convert the data model
At present, the Caris HPD method is usually used to convert DNC ​​to ENC, and its existing problems are: low conversion rate and poor conversion effect

Method used

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  • Conversion method of DNC (Digital Nautical Chart) and ENC (Electronic Nautical Chart) data models
  • Conversion method of DNC (Digital Nautical Chart) and ENC (Electronic Nautical Chart) data models
  • Conversion method of DNC (Digital Nautical Chart) and ENC (Electronic Nautical Chart) data models

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Embodiment Construction

[0043] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0044] A conversion method of DNC and ENC data model, comprises the steps:

[0045] Step 1. Perform mapping conversion of elements and attributes between DNC and ENC data models

[0046] In this step, since the classification and coding systems of elements and attributes in DNC and ENC are different, in the process of mapping from DNC to ENC, the mapping relationship between elements and attributes must be established in advance, and then the mapping conversion of elements and attributes , specifically including the following processes:

[0047] 1. Establish the element mapping relationship between DNC and ENC data models. The element mapping relationship includes:

[0048] (1) One-to-one mapping

[0049] A DNC element has an equivalent element in ENC. For example, DNC's Fortification corresponds to ENC's FORSTC.

[0050] (2) One-to-many mappi...

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Abstract

The invention relates to a conversion method of DNC (Digital Nautical Chart) and ENC (Electronic Nautical Chart) data models. The conversion method comprises the following steps: (1) establishing an element mapping relationship and a property mapping relationship between the DNC and ENC data models, and carrying out mapping conversion of elements and properties between the DNC and ENC data models; and (2) establishing a mapping relationship of topological and spatial data between the DNC and the ENC, and carrying out mapping conversion of the topological and spatial data between the DNC and the ENC. According to the conversion method, the design is reasonable, a set of complete DNC and ENC mapping models are proposed by establishing the element and property mapping relationships and the mapping relationship of the topological and spatial data between the DNC and the ENC, the high-efficiency, automatic and correct conversion from the DNC to the ENC is realized, important data sources are provided for production and application of sea chart data, foundations are also provided for fusion of different types of sea chart data, and the conversion efficiency and the conversion effect areremarkably improved.

Description

technical field [0001] The invention belongs to the field of digital graphics processing, in particular to a conversion method of DNC and ENC data models. Background technique [0002] DNC (Digital Nautical Chart) and ENC (Electronic Nautical Chart) are two major data models describing vector digital nautical charts, both of which contain various elements necessary for safe navigation at sea. These two data models mainly have the following differences: (1) Data usage: DNC is an internal standard formulated by the US military, mainly for NATO; ENC is an international standard formulated by the International Hydrographic Organization (IHO), for maritime navigation of ships from various countries, Tend to but not limited to commercial use; (2) Data standard: DNC data storage complies with the VPF standard, while ENC complies with the S-57 standard; (3) Coding system: DNC and ENC each have a set of classification and coding systems for elements and attributes ;(4) Element type:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 翟京生陆毅陈长林孙芳朱颖
Owner THE CHINESE PEOPLES LIBERATION ARMY 92859 TROOPS
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