A method for obtaining global electronic chart layered data

Abstract

The present invention discloses a method for obtaining hierarchical data of global electronic charts, comprising the steps of: collecting electronic charts covering the sea areas of the world on demand based on the principle of pay-as-you-go; performing hierarchical analysis and separate extraction of data in each electronic chart according to the attributes of the chart; and saving the extracted data in the form of GEOJSON to a database to form hierarchical data of global electronic charts based on the principle of pay-as-you-go. The present invention can obtain freely programmable hierarchical data of global electronic charts, provide a basis for navigation management, and ensure navigation safety.

Description

Technical Field

[0001] The invention belongs to the field of nautical chart data synthesis, and in particular relates to a nautical chart data processing and synthesis method for Arctic navigation based on pay-as-you-go. Background Art

[0002] In recent years, with global warming, increased energy demand and advances in shipbuilding technology, navigation on the Arctic route has become possible, and the rich energy and mineral resources in the Arctic Circle can be transported to the world. In the past, oil tankers traveled from Russia through the Atlantic Ocean and the Suez Canal to Asia, and this route took at least a month for a single trip. However, through the Northeast Passage, through the Bering Strait, into the Pacific Ocean, and to ports such as Tokyo and Shanghai, a trip only takes about 15 days, which saves half the distance compared to the Suez Canal route.

[0003] However, the Arctic shipping environment is complex and changeable, and extreme weather can occur at any time, which is a severe test for the navigation safety of ships. Therefore, the nautical chart data for Arctic navigation has become a research direction. Summary of the invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a method for processing and synthesizing nautical chart data for Arctic navigation based on pay-as-you-go, which performs layered analysis and separate extraction of data in existing electronic nautical charts, and then superimposes meteorological data, ice data and satellite images to synthesize nautical chart data for ships sailing in the Arctic, thereby providing a basis for navigation monitoring for the ship's drivers and shore managers, and ensuring navigation safety.

[0005] In order to achieve the above-mentioned object, a method for processing and synthesizing nautical chart data for Arctic navigation based on pay-as-you-go is provided in one embodiment of the present invention, which comprises the following steps:

[0006] S1. Based on the principle of pay-as-you-go, global electronic chart layered data, global meteorological data, Arctic ice data and Arctic satellite image data are available on demand;

[0007] S2. Overlay the acquired global electronic nautical chart layered data, global meteorological data, Arctic ice data, and Arctic satellite image data to obtain Arctic navigation chart data.

[0008] Furthermore, the specific steps of obtaining the global electronic chart layered data in step S1 are as follows:

[0009] P1. Based on the principle of pay-as-you-go, electronic nautical charts covering the world's oceans are collected on demand;

[0010] P2. Perform hierarchical analysis and separate extraction of data from each electronic chart according to the chart attributes;

[0011] P3. Save the extracted data in the database in the form of GEOJSON to form global electronic chart layered data based on the pay-as-you-go principle.

[0012] Furthermore, the meteorological data in step S1 includes but is not limited to weather data, wind direction data, wind force data, visibility data and wave height data.

[0013] Furthermore, the ice condition data in step S1 includes but is not limited to sea ice density data, sea ice thickness data, and snow thickness data on ice.

[0014] Furthermore, the satellite image data in step S1 includes but is not limited to SAR image data and MODIS image data.

[0015] Furthermore, there are 225 chart attributes in step P2.

[0016] Furthermore, the data superposition in step S2 is performed according to the coordinate points included in each data.

[0017] Furthermore, the method utilizes technical means including but not limited to chart attribute editing, layer editing based on chart attributes, object editing, and color table editing to perform hierarchical analysis, separate extraction, and data superposition of electronic chart data.

[0018] Furthermore, the synthesized chart data can realize multi-language display, automatic avoidance of character annotations on the chart, and support radar image overlay.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention parses each electronic nautical chart into 225 layers according to the attributes of the chart to extract data, and extracts and saves each layer of data separately, so that the global electronic nautical chart is transformed from fixed data that can only be viewed to database data that can be freely programmed and used, including 225 full layer attributes, which truly achieves the fundamental utilization of the existing global electronic nautical charts and provides strong technical support for the further application of chart data;

[0021] 2. The present invention saves the 225 layer data of each electronic chart in the form of GEOJSON. The GEOJSON format saves the longitude and latitude coordinates. The longitude and latitude coordinates can be used to superimpose the global electronic chart data with other data including meteorological data, ice data and satellite images according to the coordinate points to obtain more powerful electronic chart data;

[0022] 3. The present invention introduces ice condition data including sea ice density, sea ice thickness, and thickness of snow on ice into the electronic nautical chart data, so as to facilitate ships to predict ice conditions in the Arctic route with changeable climate and smoothly navigate the Arctic route. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the method for processing and synthesizing nautical chart data for Arctic navigation based on pay-as-you-go according to the present invention;

[0024] Figure 2 is a schematic diagram of a Mercator projection of nautical chart data synthesized by an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of a polar projection of nautical chart data synthesized by one embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram showing an online route drawing using synthesized chart data according to an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of a route before modification supported by synthetic chart data according to an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of a modified route supported by synthetic chart data according to an embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of an embodiment of the present invention in which the synthesized nautical chart data supports custom objects to mark the modified route;

[0030] Figure 8 It is an ice condition diagram after the synthesized nautical chart data is superimposed with ice condition data in one embodiment of the present invention.

[0031] In the figure:

[0032] 1-Route; 2-Area where route needs to be modified; 3-Customized object; 4-Ice layer. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions and advantages of the present invention clearer, the following Figure 1-8 The invention is further described with examples.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] As an example, Figure 1 As shown, the present invention provides a method for processing and synthesizing nautical chart data for Arctic navigation based on pay-as-you-go, comprising the following steps:

[0036] S1. Based on the principle of pay-as-you-go, global electronic chart layered data, global meteorological data, Arctic ice data and Arctic satellite image data are available on demand;

[0037] With the development of the world, the status of maritime transport in transportation is becoming more and more important. In order to ensure navigation safety, the importance of nautical charts is also increasing day by day. The traditional mode of obtaining (purchasing) nautical charts requires planning the route in advance and obtaining (purchasing) the corresponding nautical charts, which lacks flexibility. Once the route changes due to human or natural conditions, the nautical charts can only be obtained (purchased) temporarily, which may cause waste of the purchased nautical charts. Pay-as-you-go is a new mode of obtaining (purchasing) nautical charts. Pay-as-you-go means that you do not need to obtain (purchase) nautical charts in advance. You can automatically obtain (purchase) the corresponding nautical charts wherever you sail.

[0038] The present invention is based on the principle of pay-as-you-go, and does not require the purchase of all global electronic nautical charts in advance. Instead, a ship can automatically obtain (purchase) a corresponding portion of the global electronic nautical chart as needed wherever it sails during its global voyage, and then obtain the layered data of the electronic nautical chart, the corresponding global meteorological data, Arctic ice data and Arctic satellite image data.

[0039] Among them, meteorological data include weather data, wind direction data, wind speed data, visibility data, wave height and other data; ice condition data include sea ice density data, sea ice thickness data, snow thickness on ice and other data; satellite image data include but are not limited to SAR image data and MODIS image data.

[0040] Meteorological data is of various types and needs to be collected from different platforms and processed and superimposed into the system. Ice data is obtained by obtaining Arctic data through satellites and calculating the data. The prior art already has it and will not be described in detail here. In addition, the data provided by the present invention supports Mercator projection and polar projection respectively.

[0041] Further, as an embodiment, in step S1, the global electronic nautical chart layered data is obtained, and the specific steps are:

[0042] P1. Based on the principle of pay-as-you-go, electronic nautical charts covering the world's oceans are collected on demand;

[0043] The present invention uses nautical chart data in accordance with the S-57 format. There are more than 18,000 nautical charts in the world, and these 18,000 nautical charts are seamlessly spliced. The nautical charts cover the sea areas of the world like tiles. Each nautical chart covers a certain area, and they are combined to cover the sea areas of the world to form complete nautical chart data.

[0044] Sailing on the Arctic route is different from ordinary sailing. It requires sufficient electronic charts and weather data for the next few days. The climate on the Arctic route is changeable. Once a ship is troubled by ice conditions, it is likely that the route will need to be modified. Therefore, a lot of electronic charts are needed. By providing global charts, ships will have global chart data and will no longer worry about underwater safety issues.

[0045] In actual use, in order to reduce unnecessary workload and calculation of chart data analysis and chart data overlay, the method of the present invention is based on the principle of pay-as-you-go, that is, according to the actual sailing route, electronic charts are obtained on demand where you need to sail, and subsequent electronic chart data layering (similar to layers) analysis, separate extraction and data overlay synthesis are carried out.

[0046] P2. Perform hierarchical analysis and separate extraction of data from each electronic chart according to the chart attributes;

[0047] The method of the present invention performs hierarchical analysis and separate extraction of each electronic chart data through chart attribute editing, layer editing according to chart attributes, object editing, and color table editing. The present invention has 225 chart attributes, that is, 225 layers of analysis and separate extraction. The chart attributes are:

[0048] "000 Administrative district (named)", "001 Airport", "002 Anchorage", "003 Anchorage area", "004 Azimuth mark", "005 Isolated dangerous mark", "006 Side mark", "007 Safe waters mark", "008 Special / general purpose mark", "009 Berth", "010 Bridge", "011 Single building", "012 Building complex", "013 Azimuth buoy", "014 Operation buoy", "015 Isolated dangerous object buoy", "016 Side buoy", "017 Safe waters buoy", "018 Special / general purpose buoy", "019 Cable area", "020 Overhead cable", "021 Submarine cable", "022 Channel", "023 Channel embankment", "02 4 Cargo Transfer Area", "025 Long Causeway", "026 Warning Area", "027 Checkpoint", "028 Coast Guard Station", "029 Coastline", "030 Contiguous Zone", "031 Continental Shelf Zone", "032 Control Point", "033 Conveyor", "034 Crane", "035 Current", "036 Customs Zone", "037 Dam", "038 Daylight Mark", "039 Deep Water Channel Centre Line", "040 Deep Water Channel Section", "041 Deep Water Range", "042 Isobath", "043 Distance Mark", "044 Harbour Area", "045 Dredging Area", "046 Dry Dock", "047 Dumping Ground", "048 Dike", "049 Exclusive Economic Zone", "050 Channel" 、"051 Fence line", "052 Ferry route", "053 Fishing area", "054 Fishing equipment", "055 Fishing ground", "056 Floating dock", "057 Foghorn", "058 Fortification", "059 Free port area", "060 Lock gate", "061 Slipway", "062 Port area (administrative)", "063 Port equipment", "064 Scrapped ship (barge)", "065 Ice area", "066 Waste incineration area", "067 Nearshore traffic area", "068 Lake", "069 Lake shore", "070 Land part", "071 Elevation", "072 Ground zone", "073 Landmark", "074 Light beacon", "075 Light buoy", "076 Lightship", "077 Local magnetic field" force anomaly", "078 ship lock", "079 timber storage pond", "080 magnetic variation", "081 marine aquaculture farm", "082 military exercise area", "083 mooring cable equipment", "084 navigation line", "085 obstacle", "086 offshore platform", "087 offshore operation platform", "088 oil barrier", "089 wooden pile", "090 pilot boarding point", "091 pipeline area", "092 overhead pipeline", "093 submarine / land pipeline", "094 floating dock", "095 warning area", "096 production / storage area", "097 support / bridge pier", "098 radar navigation line", "099 radar effective range", "100 radar reflection area", "101 radar station","102 radar transponder", "103 radio call point", "104 radio station", "105 railway", "106 rapids", "107 recommended channel centerline", "108 recommended route", "109 recommended traffic lane", "110 rescue station", "111 restricted area", "112 reflector", "113 river", "114 river bank", "115 road", "116 runway", "117 sand pattern", " 118 Sea area / named waters", "119 Seaplane take-off and landing area", "120 Seabed area", "121 Shoreline structure", "122 Traffic signal station", "123 Warning signal station", "124 Silo / tank", "125 Slope top line", "126 Sloping ground", "127 Small marine equipment", "128 Water depth", "129 Fountain", "130 Square", "131 Continuous territorial baseline", "132 Submarine channel ", "133 Sweeping area", "134 Territorial waters", "135 Harmonic predicted tide", "136 Non-harmonic predicted tide", "137 Tidal table data", "138 Time series tide", "139 Harmonic predicted tide", "140 Non-harmonic predicted tide", "141 Time series tide", "142 Tidal path", "143 Top mark", "144 Navigation lane separation line", "145 Traffic lane separation system boundary", "146 Traffic lane separation system intersection "147 Traffic Separation Scheme Lane", "148 Traffic Separation Scheme Roundabout", "149 Navigation Separation Strip", "150 Tunnel", "151 Two-Way Navigation Lane", "152 Reef / Suitable Reef", "153 Unsurveyed Area", "154 Vegetation", "155 Turbulence", "156 Waterfall", "157 Seagrass / Giant Seaweed", "158 Wreck", "159 Tide", "160 Archipelagic Sea Lane", "161 Archipelagic Sea Lane axis", "162 New object", "163 Data accuracy", "164 Data editing scale", "165 Map area", "166 Data horizontal datum", "167 Horizontal datum transformation parameters", "168 Navigation publication information", "169 Navigation mark system", "170 Product information", "171 Data quality", "172 Water depth datum", "173 Measurement reliability", "174 Quantity measurement unit", "175 Vertical datum data", "176 Collection", "177 Relationship", "178 Stacked Objects", "179 Mapping Area", "180 Mapping Line", "181 Mapping Symbol", "182 Compass", "183 Text", "184 Signs and Labels", "185 Waterway Section", "186 Bridge Area", "187 Service Area", "188 Communication Area", "189 Harbor", "190 Garbage Recycling and Treatment Station", "191 Cargo Distribution Center", "192 Turnaround Area", "193 Navigation Buildings", "194 Berthing Area","195 Shoreline", "196 Cross-River Buildings", "197 Riverbed Cables", "198 Freshwater Farms", "199 Port and Shipping Administration", "200 Lock and Pilot Channel", "201 River Platform", "202 River Operation Area", "203 Riverbed / Land Pipelines", "204 Riverbed Area", "205 Regulation Buildings", "206 River Area / Named Waters", "207 Ship Lift", "208 Water Conservancy Equipment", "209 Hydrological Survey ...1 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pipelines", "201 Riverbed Pi "210 Shoal Hazard", "211 Barge", "212 Navigation Mark Shore Mark", "213 Navigation Mark Buoy", "214 Signal Mark Shore Mark", "215 Signal Mark Buoy", "216 Mileage Line", "217 Flow Zone", "218 Warning Mark Shore Mark", "219 Warning Mark Buoy", "220 Boundary Line", "221 Fire Station", "222 Flow Line", "223 Place Name", "224 Water Service Area".

[0049] For example, the "128 Water Depth (SOUNDG)" in the chart properties stores the water depth information of this chart. The "128 Water Depth (SOUNDG)" layer is parsed and processed separately to extract the value and longitude and latitude points of each water depth point, and then a separate water depth data table is created to store the water depth data.

[0050] P3. Save the extracted data in the database in the form of GEOJSON to form global electronic chart layered data.

[0051] The data GEOJSON format used in the present invention is a format for encoding various geographic data structures. GEOJSON uses JSON syntax to express and store geographic data, which can be said to be a subset of JSON. The geographic elements required for the above 225 chart attributes of the present invention are divided into Point, MultiPoint, LineString, MultiLineString, Polygon, MultiPolygon, and GeometryCollection. In use, these geographic elements are planned under the type attribute of the geometry feature, and different types will have different coordinates values. The position is the basic geometric structure. The "coordinates" member of the geometric object consists of a position (point), a position array (line or multipoint), an array of position arrays (faces, multilines) or a multidimensional array of positions (multifaceted). The position is represented by a digital array. There must be at least two elements, and there can be more elements. The order of elements must follow the x, y, z order (the easting, northing, and altitude of the coordinates in the projection coordinate reference system or the length, latitude, and altitude of the coordinates in the geographic coordinate reference system). For type "Point", the "coordinates" member is a single position. For type "MultiPoint", the "coordinates" member is an array of positions. For type "LineString", the "coordinates" member is an array of two or more positions. A linear ring is a closed line with 4 or more positions. The first and last positions are equal (they represent the same point). Although linear rings are not explicitly defined as a GeoJSON geometry type, they are mentioned in the polygon geometry type definition. For type "MultiLineString", the "coordinates" member must be an array of arrays of line coordinates. For type "Polygon", the "coordinates" member must be an array of arrays of linear ring coordinates. For polygons with multiple rings, the first ring must be an exterior ring, and the others must be interior rings or holes. For type "MultiPlygon", the "coordinates" member must be an array of arrays of polygon coordinates. A GeoJSON object of type "GeometryCollection" is a collection object that represents a collection of geometry objects. A geometry collection must have a member named "geometries". The value corresponding to "geometries" is an array. Each element in this array is a GEOJSON geometry object.To include coordinate range information for a geometry, feature, or feature collection, a GEOJSON object may have a member named "bbox". The value of the bbox member must be a 2*n array, where n is the number of dimensions of the contained geometry, and the lowest value of all axes is followed by the highest value. The order of the bbox axes follows the order of the geometry axes.

[0052] The present invention saves the extracted data into the database in the form of GEOJSON, which means that all the extracted data are data with longitude and latitude coordinate point location information.

[0053] S2, superimposing the global electronic nautical chart layered data, global meteorological data, Arctic ice data, and Arctic satellite image data to obtain a nautical chart for Arctic navigation;

[0054] The global electronic chart layers, global meteorological data, Arctic ice data and Arctic satellite images are superimposed according to the longitude and latitude coordinates. Similarly, through chart attribute editing, layer editing based on chart attributes, object alignment Operations such as image editing and color table editing can be performed based on coordinate points to layer global electronic charts, global weather data, and north The four types of data are superimposed, namely, the ice data of the North Pole and the satellite images of the North Pole. The resulting chart data is superimposed with the electronic The chart layer data (225 layers), global weather data, Arctic ice data and Arctic satellite image data were finally synthesized. New Arctic navigation synthetic chart data with more information and more powerful functions.

[0055] The present invention adopts electronic nautical chart data conforming to the S-57 format. For different independent point spatial object positions, point object objects can refer to the color regulations in S-52 and be distinguished by editing the color table with different colors and thicknesses; line object objects also correspond to a series of connected point spatial object positions, which are distinguished by different colors and thicknesses; for surface object objects, they also correspond to different spatial objects, and the chart contents they contain are distinguished by filling colors.

[0056] At the same time, the synthetic data of the nautical chart of the present invention can realize display in multiple languages ​​and automatic avoidance of character annotations on the nautical chart (the implementation process is, for example: by setting the display priority, the character annotation display priority is lower than the object mark display priority, and then judging the nearest position without object mark on the nautical chart to display the character annotation). The synthetic data of the nautical chart of the present invention also supports the superposition of radar images corresponding to the coordinate points.

[0057] Furthermore, the synthetic chart data of the present invention supports online route planning (such as the attached Figure 4 and electronic bearing line, supporting zooming and modifying routes (as shown in the attached Figure 5 The figure is before modification. Figure 6 The modified route is shown in the figure). Customized objects are supported to mark the modified route (see the attached Figure 7As shown in the figure, the chart is displayed to remind the driver that the chart has been modified according to the route. In addition, the synthetic chart data of the present invention can be installed on the ship and the shore through the system, and the ship's drivers can draw the route on the obtained synthetic chart data with reference to the system, check the environmental conditions of the current route and give driving instructions. The supervisors on the shore can also collaboratively modify the route on the chart on the platform to assist the ship in driving.

[0058] At the same time, the synthetic chart data of the present invention can transform the electronic chart data into Mercator projection and polar projection according to the S-52 standard, and under the Mercator projection (such as the attached Figure 2 The modifications can also be made in the polar projection (see Figure 3 The synthetic data of the nautical chart of the present invention supports satellite image updates, and updates the latest polar satellite images in real time, providing a reference for ship navigation.

[0059] Each chart object on the synthetic chart data of the present invention is rendered according to the s-52 standard, the processed chart data is published as a WMS service according to the OGC standard, and the vector chart data is carried to the front end for use by front-end users for simulation calculations, etc.

[0060] Through the method of the present invention, real-time data display and forecast data display of synthetic data of Arctic charts are provided. The forecast data can support the next 1-3 days, 4-7 days, 8-15 days, 16-30 days, 1-3 months, and up to 9 months, which is beneficial to ensure the navigation safety of ships sailing in the Arctic.

[0061] Optionally, in this embodiment, a person of ordinary skill in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by instructing hardware related to the terminal device through a program, and the program may be stored in a computer-readable storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0062] If the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling one or more computer devices (which can be personal computers, servers or network devices, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention.

[0063] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0066] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for obtaining global electronic chart layered data, characterized in that: It includes the following steps: P1. Based on the principle of pay-as-you-go, electronic nautical charts covering the world's oceans are collected on demand; P2. Perform hierarchical analysis and separate extraction of data from each electronic chart according to the chart attributes, including: There are 225 chart attributes in total, that is, the data in each electronic chart is parsed and extracted separately in 225 layers, and the chart attributes include: administrative district, airport, anchorage, anchorage area, azimuth mark, isolated danger mark, side mark, safe waters mark, berth, bridge, single building, building complex area, azimuth buoy, operation buoy, isolated danger buoy, side buoy, safe waters buoy, cable area, overhead cable, submarine cable, channel, canal embankment, cargo transfer area, long embankment, warning area, checkpoint, coast guard station, coastline, contiguous area, continental shelf area, control point, transmission device, crane, ocean current, customs area, dam, day mark, water depth, deep-water channel centerline, deep-water channel part, deep-water range, isobath, distance mark, harbor area, dredging area, dry dock, dumping ground, embankment, exclusive economic zone, channel, fence Fences, ferry routes, fishing areas, fishing equipment, fishing grounds, floating docks, foghorns, fortifications, free port areas, gates, slipways, port equipment, ice areas, waste incineration areas, nearshore traffic areas, lakes, lake shores, land areas, elevations, ground zones, landmarks, beacons, light buoys, light ships, local magnetic anomalies, ship locks, timber storage ponds, magnetic variation, marine aquaculture farms, military exercise areas, mooring cable equipment, routes, obstacles, offshore platforms, pipeline areas, floating docks, warning areas, radar reflection areas, radar stations, recommended channel centerlines, restricted areas, rivers, riverbanks, roads, seaplane take-off and landing areas, seabed areas, submarine channels, harmonic prediction tidal currents, navigation lane separation lines, tunnels, turbulence, sunken ships, service areas, anchorage areas, shorelines, cross-river buildings, riverbed cables, freshwater aquaculture farms, ship lock pilot channels, river platforms, shoal hazards, and water service areas; The water depth information of the chart is stored in the water depth attribute of the chart attributes. The water depth layer is analyzed separately to extract the value and longitude and latitude points of each water depth point, and then a separate water depth data table is created to store the water depth data. For point object objects, different independent point spatial object positions are distinguished by different colors and thicknesses through color table editing in accordance with the color regulations in the S-52 standard; line object objects also correspond to a series of connected point spatial object positions, which are distinguished by different colors and thicknesses; for surface object objects, different spatial objects are also corresponding, and the chart contents they contain are distinguished by color filling; P3. Save the extracted data in the database in the form of GEOJSON to form global electronic chart layered data based on the pay-as-you-go principle; Each electronic nautical chart is parsed into 225 layers according to the chart attributes to extract data, and each layer of data is extracted and saved separately, so that the global electronic nautical charts are transformed from fixed data that can only be viewed to database data that can be freely programmed and used, including 225 full layer attributes; The 225 layers of data of each electronic chart are saved in the form of GEOJSON. The longitude and latitude coordinates are saved in the GEOJSON format. The longitude and latitude coordinates can be used to superimpose the global electronic chart data with other data including meteorological data, ice data and satellite images according to the coordinate points to obtain more powerful electronic chart data.

2. The method for obtaining global electronic nautical chart layered data according to claim 1, characterized in that: The global electronic nautical chart layered data can be superimposed with synthetic nautical chart synthetic data.

3. The method for obtaining global electronic chart layered data according to claim 2, characterized in that: Synthetic chart data supports online route design and electronic bearing line presentation, supports zooming in and out to modify routes, and supports custom objects to mark modified routes to remind drivers that the chart has been modified according to the route.

4. The method for obtaining global electronic nautical chart layered data according to claim 3, characterized in that: The synthetic chart data can be installed on the ship and the shore through the system. The ship's drivers can refer to the system to draw routes on the synthetic chart data, check the environmental conditions of the current route and give driving instructions; the supervisors on the shore can also collaboratively modify the routes on the chart on the platform to assist the ship's driving.

5. The method for obtaining global electronic nautical chart layered data according to claim 4, characterized in that: The synthesized chart data can be displayed in multiple languages, automatically avoid character markings on the chart, and support radar image overlay.

6. The method for obtaining global electronic nautical chart layered data according to claim 5, characterized in that: The synthetic chart data can transform the electronic chart data into Mercator projection and Polar projection according to the S-52 standard, and the changes made under the Mercator projection can also be viewed and reproduced under the Polar projection for easy inspection.

7. The method for obtaining global electronic nautical chart layered data according to claim 6, characterized in that: The synthetic chart data supports satellite image updates and real-time updates of the latest polar satellite images to provide reference for ship navigation.

8. The method for obtaining global electronic chart layered data according to claim 7, characterized in that: Each chart object on the synthetic chart data is rendered according to the S-52 standard. The processed chart data is published as a WMS service according to the OGC standard, and the vector chart data is carried to the front end for front-end users to use for simulation calculations.

Images