CN110825761B - Sea chart data arrangement and updating method for ship-shore-oriented distributed electronic sea chart system - Google Patents
Sea chart data arrangement and updating method for ship-shore-oriented distributed electronic sea chart system Download PDFInfo
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- CN110825761B CN110825761B CN201911110822.4A CN201911110822A CN110825761B CN 110825761 B CN110825761 B CN 110825761B CN 201911110822 A CN201911110822 A CN 201911110822A CN 110825761 B CN110825761 B CN 110825761B
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- G06F16/23—Updating
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Abstract
The invention belongs to the field of navigation and provides a ship-shore-oriented distributed electronic chart system and a chart data arrangement and updating method; the ship-side electronic sea chart system comprises a ship-side electronic sea chart system and a shore-side electronic sea chart system, wherein the ship-side electronic sea chart system comprises a ship-side server and a plurality of ship terminals, the shore-side electronic sea chart system comprises a shore-side server and a plurality of shore terminals, and the ship-side server and the shore-side server can realize bidirectional intercommunication of data of the electronic sea chart system and the shore-side electronic sea chart system through a network. On the basis of the system, a method for arranging and updating the chart data is correspondingly arranged.
Description
Technical Field
The invention belongs to the field of navigation and discloses a sea chart data arrangement and updating method for a ship-shore-oriented distributed electronic sea chart system.
Background
The electronic chart system is a product of multi-disciplinary cross development such as navigation technology, ocean mapping technology, geographic information system GIS technology, computer network and the like, and is widely applied to the fields of ship navigation, port monitoring, hydrological meteorological measurement and the like. The basic function of the electronic chart system is to provide visual situation display of global electronic chart data for users, and to build various electronic chart application services with the visual situation display as a core. Along with the development of ocean and the continuous maturation of ocean technology, particularly the proposal of intelligent ships and intelligent navigation concepts, the application scene of the electronic chart is continuously developed from the single node application of the past shore-based platform monitoring, ship navigation, offshore platform monitoring and the like to the networked, ship-shore cooperation and ship-shore integrated application direction.
The chart data is the basis of various applications of the electronic chart system, so a series of specifications and standards are issued for the international maritime organization and the international waterway measurement organization of the electronic chart data, and detailed specifications are carried out on the transmission, organization structure, display and symbolization of the electronic chart data. However, these standards are not formulated for networked electronic chart applications, and standard S57/S63 chart data cannot be directly applied to a shore-based distributed electronic chart system due to the need for data analysis, data processing, graphic rendering, and the like. In the existing ship-shore communication network environment, how to arrange and update the electronic chart data is one of key technologies for realizing the application of the ship-shore distributed electronic chart system.
In the current electronic chart system based on network application, the electronic chart data mainly adopts raster chart data, and when a user accesses Web chart service through a browser, a large amount of chart tile data is transmitted through a network to carry out chart application. The grating chart meeting the global navigation application has the data scale of several TB to tens TB, the data scale is transmitted in the bandwidth of the existing ship-shore communication network to greatly occupy the data bandwidth of other applications, the running speed of the system is reduced, the system cannot run, and the use cost is also difficult to bear under the existing communication flow charging condition. The invention provides a sea chart data arrangement and updating method for a ship-shore-oriented distributed electronic sea chart system, which is suitable for ocean vessels.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a sea chart data arrangement and updating method for a ship-shore-oriented distributed electronic sea chart system, which is suitable for the conditions of low communication bandwidth and high data flow expense of the existing ship shore.
The technical scheme adopted by the invention is as follows:
a ship shore-oriented distributed electronic chart system is characterized in that: the ship-side electronic sea chart system comprises a ship-side electronic sea chart system and a shore-side electronic sea chart system, wherein the ship-side electronic sea chart system comprises a ship-side server and a plurality of ship terminals, the shore-side electronic sea chart system comprises a shore-side server and a plurality of shore terminals, and the ship-side server and the shore-side server can realize bidirectional intercommunication of data of the ship-side electronic sea chart system and the shore-side electronic sea chart system through a network.
A sea chart data arrangement and update method for a ship-shore-oriented distributed electronic sea chart system is applied, and is characterized in that: the method comprises the following steps:
step 1: slicing according to the vector electronic chart data, producing chart slices, and generating chart grating tile data according to longitude and latitude;
step 2: respectively arranging the grating tile data on a shore-end server and a ship-end server;
step 3: when a ship end user accesses the electronic chart system by using a browser, the system judges to access a ship end or a shore end chart data server according to the state of the ship and communication conditions;
step 4: and the ship-end electronic sea chart system automatically judges an updating mode according to the ship communication condition, and selects a machine to update sea chart slice data in the server.
Further, in the step 1, slicing is performed on different positions according to vector electronic chart data used by the ship-shore distributed electronic chart, so as to generate raster tile data of the electronic chart.
Further, in the step 2, the data are organized according to the corresponding geographical longitude and latitude of the tile data, and are deployed on a shore server and a ship server of the ship-shore distributed electronic chart system respectively.
In step 3, before the ship end browser of the B/S architecture-based electronic chart system accesses the server, the system accesses the ship end server or the shore end server according to the communication status of the ship, preferably, the motion parameters of the ship, and reads the raster tile data.
Further, in the step 4, the ship-side electronic chart system updates chart raster tile data stored in the ship-side server according to the ship communication condition until the data is synchronized with the data of the shore-side server.
The invention has the advantages and positive effects that:
in the invention, the ship-end electronic chart system and the shore-end electronic chart system are adopted to realize the bidirectional intercommunication of data through an external network, such as maritime satellite, wired optical fiber communication or mobile communication technology.
The method for arranging and updating the chart data has the following advantages. In the step 1, the map is cut into small sea chart grating data tiles according to the corresponding picture range, sliced pixels, proportion level and the like, and when a ship end or a shore end server receives a receiving requirement, the generated sea chart data tiles can be spliced and returned to a client; in step 2, the deployment amount of the initial tile data can be determined according to the geographical latitude and longitude range of the navigation area or the operation area of the ship, so as to cover the relevant sea area as much as possible. The amount of transmitted tile data required by a user in the using process is reduced as much as possible; in step 3, checking the current ship position and the chart coverage condition of the sea area in the shipborne server in the service logic layer of the system, and directly reading the shipborne server when the current ship position and the chart coverage condition can be covered; and when the system cannot cover all the ship, the system performs network speed test to judge the communication condition of the ship, if the communication speed of the ship is monitored to be greater than the minimum speed system required by the system operation, the system reads the shore-based server, and otherwise, the system reads the data from the shipborne server. The ship-end electronic chart system produces data access records according to access conditions; in step 4, the ship-end electronic chart system monitors the communication state of the ship, and when the ship is monitored to be stationary and the communication rate is greater than the designated rate, the ship is generally in a dock port state. At the moment, the ship-side electronic chart system automatically updates the raster chart data of the relevant sea area in time according to the data access record. The method is suitable for the communication requirements of the existing ship-shore environment with low communication bandwidth and high data flow cost.
Drawings
FIG. 1 is a diagram of the composition of the ship-shore distributed electronic chart system of the present invention;
FIG. 2 is a flow chart of the access data service of the ship-side electronic chart system of the invention;
FIG. 3 is a flow chart of the updating data of the ship-side electronic chart system.
Detailed Description
The invention will now be further illustrated by reference to the following examples, which are intended to be illustrative, not limiting, and are not intended to limit the scope of the invention.
The technical scheme adopted by the invention is as follows:
the invention discloses a ship-shore-oriented distributed electronic sea chart system, which is characterized by comprising a ship-side electronic sea chart system and a shore-side electronic sea chart system, wherein the ship-side electronic sea chart system comprises a ship-side server and a plurality of ship terminals, the shore-side electronic sea chart system comprises a shore-side server and a plurality of shore terminals, and the ship-side server and the shore-side server can realize bidirectional intercommunication of data of the electronic sea chart system and the shore-side electronic sea chart system through a network.
The sea chart data arrangement and updating method (taking China offshore C100102 chart range longitude: 105-133 degrees and latitude: 3-41 degrees as an example) using the system is innovative and comprises the following steps:
step 1: slicing according to the vector electronic chart data, producing chart slices, setting each slice to be 256 multiplied by 256 pixels, and generating 4500 ten thousand tile file data when the cutting level is 16 levels in chart areas with a C100102 chart scope;
step 2: respectively arranging the grating tile data on a shore-end server and a ship-end server;
in addition to deploying all of the chart tile data in the shore side server, initial tile data is deployed in the ship side server of the distributed electronic chart system. The deployment amount of the initial tile data can be determined according to the geographical longitude and latitude range of the navigation area or the operation area of the ship, and the relevant sea area is covered as much as possible.
Step 3: when a ship end user accesses the electronic chart system by using a browser, the system judges to access a ship end or a shore end chart data server according to the state of the ship and communication conditions;
further, in the step 3, before the ship end browser of the B/S architecture-based electronic chart system accesses the server, the system accesses, preferably, the ship end server or the shore end server according to the communication status (such as the net speed) of the ship, the motion parameters (such as the position) of the ship, and reads the raster tile data.
The browser performs data interaction with the Server through the Web Server. Service layer business logic of the distributed electronic Chart system adopts Chart Service (Chart Service) developed by VSC# under the Dotnet Framework4 environment of Microsoft. In order to facilitate maintenance, upgrading and realizing distributed application, a business logic Service layer and a data access layer are separated, wherein the business logic Service layer consists of a Chart Service interface and middleware, and a Web page calls a database through the business logic Service layer.
After receiving the access request, the browser of the ship-side electronic chart system checks the current ship position and chart coverage condition of the sea area in the ship-borne server in the service logic layer of the system, and when the current ship position and the chart coverage condition of the sea area in the ship-borne server can be covered, the ship-borne server is directly read; and when the system cannot fully cover, the network speed test is carried out to judge the communication condition of the ship, and when the communication rate of the ship is monitored to be greater than the minimum rate (set as 6Mbps in the example) required by the operation of the system, the system reads the shore-based server, otherwise, the system reads the data from the shipborne server. And the ship-side electronic chart system produces data access records according to the access condition.
Step 4: and the ship-end electronic sea chart system automatically judges an updating mode according to the communication condition (such as the network speed) of the ship, and selects a machine to update sea chart slice data in the server.
In this embodiment, in the step 4, the ship-side electronic chart system monitors the communication state of the ship, and when it is monitored that the ship is stationary and the communication rate is greater than the specified rate (50 Mbps in this example), the ship is generally in the dock-port state. At the moment, the ship-side electronic chart system automatically updates the raster chart data of the relevant sea area in time according to the data access record.
Claims (1)
1. A marine chart data arrangement and update method for a ship-shore-oriented distributed electronic marine chart system is characterized by comprising the following steps of: the method is applied to a ship-shore-oriented distributed electronic sea chart system, and comprises a ship-side electronic sea chart system and a shore-side electronic sea chart system, wherein the ship-side electronic sea chart system comprises a ship-side server and a plurality of ship terminals, the shore-side electronic sea chart system comprises a shore-side server and a plurality of shore terminals, the ship-side server and the shore-side server can realize bidirectional intercommunication of data of the electronic sea chart system and the shore-side electronic sea chart system through a network, and the data arrangement and updating process of the ship-shore distributed electronic sea chart system comprises the following steps:
step 1: slicing according to vector electronic chart data to produce chart slices, wherein generating chart grating tile data according to longitude and latitude comprises slicing according to vector electronic chart data used by ship-shore distributed electronic charts, and generating grating tile data of electronic charts;
step 2: the arrangement of the grating tile data on the shore server and the ship server respectively comprises organizing the data according to the corresponding geographic longitude and latitude of the tile data, and arranging the data on the shore server and the ship server of the ship distributed electronic chart system respectively;
step 3: when a ship end user accesses the electronic chart system by using a browser, the system judges that the ship end or the shore end chart data server is accessed according to the state and the communication condition of the ship, wherein before the ship end browser of the electronic chart system based on the B/S architecture accesses the server, the system preferably accesses the ship end server or the shore end server according to the communication condition of the ship, and reads the raster tile data;
step 4: the marine-side electronic chart system automatically judges an updating mode according to the ship communication condition, and the marine-side electronic chart system selects the machine to update the sea chart slice data in the server, wherein the marine-side electronic chart system updates the sea chart grating tile data stored in the ship-side server according to the ship communication condition until the data is synchronous with the data of the shore-side server;
wherein, the step 2 includes deploying initial tile data in a ship end server of the distributed electronic chart system in addition to deploying all chart tile data in a shore end server; the deployment amount of the initial tile data can be determined according to the geographical longitude and latitude range of the navigation area or the operation area of the ship.
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| CN111290392B (en) * | 2020-02-29 | 2020-11-06 | 长江三峡通航管理局 | System and method for controlling formation and cooperative stop of ship passing through gate |
| CN113407621A (en) * | 2021-05-14 | 2021-09-17 | 福建瑶光智能科技有限公司 | Method, device and medium for synchronizing chart data of terminal equipment and server |
| CN116860899B (en) * | 2023-05-18 | 2024-06-04 | 广州海宁海务技术咨询有限公司 | Updating method of ship inventory chart data |
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