CN110069556B - DWG format vector map service publishing method and device - Google Patents
DWG format vector map service publishing method and device Download PDFInfo
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
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- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
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- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/50—Information retrieval; Database structures therefor; File system structures therefor of still image data
- G06F16/56—Information retrieval; Database structures therefor; File system structures therefor of still image data having vectorial format
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Abstract
The invention relates to a DWG format vector map service publishing method and a device, the method firstly receives and analyzes a map access request sent by a client, and the request comprises DWG data parameters needing to be accessed; reading DWG data according to the DWG data parameters of the map access request, wherein the DWG data comprises complete DWG files and symbol parameters of the layer elements; packaging the read DWG data into a vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS; and returning the vector map service to the client through a communication interface. The method can directly and automatically release the DWG data into the vector map service in one step, saves the process of converting the DWG format data into a GIS format and then releasing the vector map by using a GIS sharing and releasing method, and avoids the problems of symbol loss or vector edge connection caused by data format conversion.
Description
Technical Field
The invention relates to the technical field of geographic information, in particular to a DWG format vector map service publishing method and device.
Background
The network geographic information system (WebGIS) changes the publishing and sharing modes of the geographic information system, and the utilization of the network publishing space service to provide the functions of browsing, inquiring, analyzing and the like of the spatial data for the user is an important transformation of the application mode of the geographic information data in recent years. The vector topographic map with DWG as the main data format is an important component of urban survey results, plays an important role in urban planning, construction and management, and how to rapidly release the DWG format data into networked map service becomes an urgent need. However, the DWG format data and the GIS data have great differences in data organization, object model, and symbolic expression, and cannot directly adopt a method for sharing and publishing GIS data, and the solution is usually to convert the DWG format data into a GIS format and then to share and publish the GIS data, which is complex in process, requires a lot of manpower and material resources, and often has the problems of symbol loss and vector border.
Therefore, a scholars adopts a rasterization method for converting a DWG vector topographic map into a map tile, the DWG vector topographic map is regarded as raster image data to be shared and distributed, the problem of conversion from the DWG data to GIS data is avoided, vector data rasterization and map slicing are mainly worked, and the method can solve the problems of network sharing and distribution of the DWG vector topographic map. However, the grid slice generated by the method is difficult to update, only can be used as a map base map, and vector service cannot be provided.
Aiming at the problems in the prior art, the invention provides a method and a device for issuing a DWG format vector map service, which can directly issue DWG format data as a vector map service in one step, and is different from the service of issuing a DWG vector map as a tile, the method and the device directly return a map or vector data which is rendered in time according to client request parameters without vector data rasterization and map slicing processes.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the method and the device for issuing the DWG format vector map service, which can directly issue DWG format data into the vector map service in one step automatically.
The technical scheme for solving the technical problems is as follows:
in a first aspect, the present invention provides a DWG format vector map service publishing method, including the following steps:
receiving and analyzing a map access request sent by a client, wherein the request comprises DWG data parameters needing to be accessed;
reading DWG data according to the DWG data parameters of the map access request, wherein the DWG data comprises complete DWG files and symbol parameters of the layer elements;
packaging the read DWG data into a vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS;
and returning the vector map service to the client through a communication interface.
Further, the receiving and analyzing a map access request sent by a client includes:
after receiving a map access request sent by a client, verifying the data access authority of the client;
and if the authority passes, analyzing the map access request sent by the client, otherwise, returning prompt information of refusing access.
Further, the analyzing of the map access request sent by the client includes analyzing map parameters requested by the client, where the map parameters include a spatial range of data, a layer to be included, and a format to be output.
Further, reading the DWG data according to the DWG data parameters of the map access request, and the reading comprises the following steps:
and accessing the DWG file by using a Teigha tool kit, recording the symbol parameters of the layer elements, and caching the read DWG data.
Further, the read DWG data is packaged into a vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS; the method for encapsulating the read DWG data into the vector map service meeting the WMS standard of OGC comprises the following steps:
defining the layers parameter of the GetMap interface as the layer parameter requested by the client, the bbox parameter as the space range parameter requested by the client and the format parameter as the service picture type parameter requested by the client;
the method comprises the steps of obtaining a map picture through a GetMap interface, namely retrieving in a read DWG file according to request parameters sent by a client, inquiring the client request range and containing DWG data of a request layer, cutting vector elements which exceed the client request range in the inquired DWG data, then drawing an API (application programming interface) on the cut DWG data by utilizing a GDI (graphics device interface), drawing point, line and surface elements according to the read symbol parameters of point elements in the original DWG file, such as color, size and the like, the symbol parameters of line elements, such as color, line type, line width and the like, and the internal filling parameters of the surface elements, and generating a service picture in the client request format.
Further, the read DWG data is packaged into a vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS; the method for encapsulating the read DWG data into the vector map service conforming to the WFS standard of OGC comprises the following steps:
defining a typeName parameter of a GetFeature interface as a layer parameter requested by a client, a bbox parameter as a space range parameter requested by the client and an outputFormat parameter as an output format parameter requested by the client;
and returning layer elements by realizing a GetFeture interface, namely retrieving in the read DWG file according to request parameters sent by the client, inquiring the DWG data which is in the request range of the client (obtained by intersecting the read DWG data with the request range of the client) and contains the request layer, and then transmitting geospatial data to the client through a GML (geographic markup language).
Further, the read DWG data is packaged into a vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS; the method for encapsulating the read DWG data into the vector map service of MapServer conforming to ARCGIS comprises the following steps:
defining the layer parameter of an Export Map interface as a layer parameter requested by a client, the bbox parameter as a spatial range parameter requested by the client, the format parameter as a service picture type parameter requested by the client, the layer parameter of an Identify interface as a layer parameter requested by the client, the maptextent parameter as a spatial range parameter requested by the client, and the layer parameter of a Query interface as a layer parameter requested by the client;
obtaining a Map picture through an Export Map interface, namely retrieving a read DWG file according to a request parameter sent by a client, inquiring the request range of the client and containing DWG data of a request layer, cutting vector elements which exceed the request range of the client in the inquired DWG data, then drawing a point, a line and a surface element by utilizing a GDI (graphics device interface) graph on the cut DWG data, and generating a service picture in a client request format according to the read symbol parameters of the point element and the line element in the original DWG file and the internal filling parameter of the surface element; returning the inquired element attribute information to the client through realizing an identity interface; and returning the element set of the space Query or the attribute Query to the client by implementing a Query interface.
The invention has the beneficial effects that: the DWG format vector map service publishing method provided by the invention can directly and automatically publish DWG data into vector map service in one step, saves the process of publishing the vector map by using a GIS sharing and publishing method after converting the DWG format data into a GIS format, and avoids the problems of symbol loss or vector edge connection caused by data format conversion.
In a second aspect, the present invention provides a DWG format vector map service delivery apparatus, including:
the client interface module is used for establishing communication connection with the client, receiving a service access request of the client or returning the generated DWG vector map service to the client;
the request analysis module is used for analyzing map parameters requested by the client, including the spatial range of data, layers to be included and formats to be output;
the DWG data reading module is used for reading the DWG data and the symbol parameters of the DWG data;
and the vector map service generation module is used for packaging the DWG data into the vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS.
Furthermore, the device also comprises an authority verification module used for verifying the data access authority of the client; and if the authority passes, analyzing the map access request sent by the client, otherwise, returning prompt information of refusing access.
Further, the DWG data reading module further includes a data caching unit configured to cache the read DWG data.
In a third aspect, the present invention provides a computer-readable storage medium, in which a computer software program for implementing a DWG format vector map service distribution method as described above is stored.
In a fourth aspect, the present invention provides a DWG format vector map service publishing device, comprising a processor and a memory;
the memory is used for storing a computer software program;
the processor is used for reading the computer software program stored in the memory, so that the DWG format vector map service distribution method is realized.
Drawings
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
fig. 2 is a schematic block diagram of a device structure according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a DWG format vector map service publishing method, including the following steps:
And step 400, reading DWG data according to the DWG data parameters of the map access request, wherein the DWG data comprises complete DWG files and symbol parameters of the layer elements. And accessing the DWG file by using a Teigha tool kit, recording the symbol parameters of the layer elements, and caching the read DWG data.
Teigha is a software development kit which is developed and researched by Open design alliance (ODA alliance) in the united states for many years and is specially used for reading and writing file formats such as DWG, DGN and the like, and provides an object-oriented development interface based on c + +, so that the contents of DWG graphic files can be quickly read and written through the object-oriented development interface. The method can correctly analyze and interpret DWG and DGN format information, and support the DWG file format of the latest version at present, and the names and the functions of most interfaces and class libraries of the method are close to the objectARX of the secondary development library of AutoCAD.
And 500, packaging the read DWG data into a vector map service which meets WMS or WFS standard of OGC or MapServer standard of ARCGIS.
The method for encapsulating the read DWG data into the vector map service meeting the WMS standard of OGC comprises the following steps:
1) defining the layers parameter of the GetMap interface as the layer parameter requested by the client, the bbox parameter as the space range parameter requested by the client and the format parameter as the service picture type parameter requested by the client;
2) the method comprises the steps of obtaining a map picture through a GetMap interface, namely retrieving in a read DWG file according to request parameters sent by a client, inquiring the client request range and containing DWG data of a request layer, cutting vector elements which exceed the client request range in the inquired DWG data, then drawing an API (application programming interface) on the cut DWG data by utilizing a GDI (graphics device interface), drawing point, line and surface elements according to the read symbol parameters of point elements in the original DWG file, such as color, size and the like, the symbol parameters of line elements, such as color, line type, line width and the like, and the internal filling parameters of the surface elements, and generating a service picture in the client request format.
The method for encapsulating the read DWG data into the vector map service conforming to the WFS standard of OGC comprises the following steps:
1) defining a typeName parameter of a GetFeature interface as a layer parameter requested by a client, a bbox parameter as a space range parameter requested by the client and an outputFormat parameter as an output format parameter requested by the client;
2) and returning layer elements by realizing a GetFeture interface, namely retrieving in the read DWG file according to request parameters sent by the client, inquiring the DWG data which is in the request range of the client (obtained by intersecting the read DWG data with the request range of the client) and contains the request layer, and then transmitting geospatial data to the client through a GML (geographic markup language).
The method for encapsulating the read DWG data into the vector map service of MapServer conforming to ARCGIS comprises the following steps:
1) defining the layer parameter of an Export Map interface as a layer parameter requested by a client, the bbox parameter as a spatial range parameter requested by the client, the format parameter as a service picture type parameter requested by the client, the layer parameter of an Identify interface as a layer parameter requested by the client, the maptextent parameter as a spatial range parameter requested by the client, and the layer parameter of a Query interface as a layer parameter requested by the client;
2) obtaining a Map picture through an Export Map interface, namely retrieving a read DWG file according to a request parameter sent by a client, inquiring a client request range and containing DWG data of a request layer, cutting out vector elements which exceed the client request range in the inquired DWG data, then drawing an API (application programming interface) on the cut DWG data by using a GDI (graphics device interface), and drawing point, line and surface elements according to the read symbol parameters such as color and size of point elements, the color, line type, line width and the like of line elements and the internal filling parameter of the surface elements to generate a service picture in a client request format; returning the inquired element attribute information (including element coordinate attributes) to the client through realizing an identity interface; and returning the element set of the space Query or the attribute Query to the client by implementing a Query interface.
And step 600, returning the vector map service to the client through a communication interface.
The DWG format vector map service publishing method provided by the invention can directly and automatically publish DWG data into vector map service in one step, saves the process of publishing the vector map by using a GIS sharing and publishing method after converting the DWG format data into a GIS format, and avoids the problems of symbol loss or vector edge connection caused by data format conversion.
Fig. 2 is a schematic block diagram of a structure of a DWG format vector map service publishing device according to an embodiment of the present invention, including:
and the client interface module is used for establishing communication connection with the client, receiving a service access request of the client or returning the generated DWG vector map service to the client.
The authority verification module is used for verifying the data access authority of the client; and if the authority passes, analyzing the map access request sent by the client, otherwise, returning prompt information of refusing access.
And the request analysis module is used for analyzing the map parameters requested by the client, including the spatial range of the data, the layers to be included and the format to be output.
And the DWG data reading module is used for reading the DWG data and the symbol parameters of the DWG data.
And the vector map service generation module is used for packaging the DWG data into the vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS.
Further, the DWG data reading module further includes a data caching unit configured to cache the read DWG data.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A DWG format vector map service publishing method is characterized by comprising the following steps:
receiving and analyzing a map access request sent by a client, wherein the request comprises DWG data parameters needing to be accessed;
reading DWG data according to the DWG data parameters of the map access request, wherein the DWG data comprises complete DWG files and symbol parameters of the layer elements;
packaging the read DWG data into a vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS;
returning the vector map service to a client through a communication interface;
the method for encapsulating the read DWG data into the vector map service of MapServer conforming to ARCGIS comprises the following steps:
defining the layer parameter of an Export Map interface as a layer parameter requested by a client, the bbox parameter as a spatial range parameter requested by the client, the format parameter as a service picture type parameter requested by the client, the layer parameter of an Identify interface as a layer parameter requested by the client, the maptextent parameter as a spatial range parameter requested by the client, and the layer parameter of a Query interface as a layer parameter requested by the client;
obtaining a Map picture through an Export Map interface, namely retrieving a read DWG file according to a request parameter sent by a client, inquiring the request range of the client and containing DWG data of a request layer, cutting vector elements which exceed the request range of the client in the inquired DWG data, then drawing a point, a line and a surface element by utilizing a GDI (graphics device interface) graph on the cut DWG data, and generating a service picture in a client request format according to the read symbol parameters of the point element and the line element in the original DWG file and the internal filling parameter of the surface element; returning the inquired element attribute information to the client through realizing an identity interface; and returning the element set of the space Query or the attribute Query to the client by implementing a Query interface.
2. The method of claim 1, wherein receiving and analyzing a map access request from a client comprises:
after receiving a map access request sent by a client, verifying the data access authority of the client;
and if the authority passes, analyzing the map access request sent by the client, otherwise, returning prompt information of refusing access.
3. The method according to claim 1 or 2, wherein analyzing the map access request sent by the client comprises analyzing map parameters requested by the client, wherein the map parameters comprise a spatial range of data, layers to be included and a format to be output.
4. The method of claim 1, wherein reading DWG data according to the DWG data parameters of the map access request comprises:
and accessing the DWG file by using a Teigha tool kit, recording the symbol parameters of the layer elements, and caching the read DWG data.
5. The method of claim 1, wherein the DWG data read is packaged into a vector map service that conforms to WMS or WFS standards for OGC, or MapServer standards for ARCGIS; the method for encapsulating the read DWG data into the vector map service meeting the WMS standard of OGC comprises the following steps:
defining the layers parameter of the GetMap interface as the layer parameter requested by the client, the bbox parameter as the space range parameter requested by the client and the format parameter as the service picture type parameter requested by the client;
the method comprises the steps of obtaining a map picture through a GetMap interface, namely retrieving in a read DWG file according to request parameters sent by a client, inquiring the client request range and containing DWG data of a request layer, cutting vector elements which exceed the client request range in the inquired DWG data, drawing a point element, a line element and a surface element by utilizing a GDI (graphics device interface) drawing API (application programming interface) of the cut DWG data, and drawing the point element, the line element and the surface element according to the read symbol parameters of the point element and the line element in the original DWG file and the internal filling parameters of the surface element to generate a service picture in a client request format.
6. The method of claim 1, wherein the DWG data read is packaged into a vector map service that conforms to WMS or WFS standards for OGC, or MapServer standards for ARCGIS; the method for encapsulating the read DWG data into the vector map service conforming to the WFS standard of OGC comprises the following steps:
defining a typeName parameter of a GetFeature interface as a layer parameter requested by a client, a bbox parameter as a space range parameter requested by the client and an outputFormat parameter as an output format parameter requested by the client;
and returning layer elements through a GetFeture interface, namely retrieving in the read DWG file according to request parameters sent by the client, inquiring the DWG data which is in the request range of the client and contains the request layer, and then transmitting the geospatial data to the client through the GML.
7. A DWG format vector map service distribution apparatus, characterized by comprising:
the client interface module is used for establishing communication connection with the client, receiving a service access request of the client or returning the generated DWG vector map service to the client;
the request analysis module is used for analyzing map parameters requested by the client, including the spatial range of data, layers to be included and formats to be output;
the DWG data reading module is used for reading the DWG data and the symbol parameters of the DWG data;
and the vector map service generation module is used for packaging the DWG data into the vector map service which accords with WMS or WFS standard of OGC or MapServer standard of ARCGIS.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer software program for implementing a DWG format vector map service publishing method as claimed in any one of claims 1 to 6.
9. A DWG format vector map service publishing device is characterized by comprising a processor and a memory;
the memory is used for storing a computer software program;
the processor is used for reading the computer software program stored in the memory so as to realize a DWG format vector map service publishing method as claimed in any one of claims 1-6.
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| CN110928901B (en) * | 2019-10-28 | 2022-05-31 | 武大吉奥信息技术有限公司 | Map layer joint query method, device and storage device based on MapServer service protocol |
| CN111459934B (en) * | 2020-03-19 | 2023-09-22 | 北京图创时代科技有限公司武汉分公司 | Multi-source map data slicing system and method |
| CN111538700A (en) * | 2020-04-22 | 2020-08-14 | 深圳市欣横纵技术股份有限公司 | Method for publishing CAD file into electronic map |
| CN111611338A (en) * | 2020-05-15 | 2020-09-01 | 交通运输部规划研究院 | Dynamic map clipping method and device and storage medium |
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Denomination of invention: A Method and Device for Publishing Vector Map Services in DWG Format Effective date of registration: 20230613 Granted publication date: 20211112 Pledgee: Wuhan area branch of Hubei pilot free trade zone of Bank of China Ltd. Pledgor: WUHAN ZHONGZHI HONGTU TECHNOLOGY CO.,LTD. Registration number: Y2023420000231 |
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