CN107239531B - Implementation method for expanding WMS service of GeoServer releasing custom tiles - Google Patents
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Abstract
The invention discloses a realization method for expanding a WMS service of a GeoServer releasing user-defined tile, which comprises the following steps: pre-downloading map tiles and storing the map tiles in corresponding custom folders; establishing a configuration file of map parameter information in a custom folder; configuring a layer corresponding to the user-defined folder in a data directory of the GeoServer; analyzing a self-defined tile data source information file according to a received network map obtaining request, and positioning to a required self-defined tile data source; analyzing map parameter information of the map tiles by utilizing the user-defined tile feature classes; and calling a corresponding index number calculation method according to the received map parameter information, the tile slicing rule and the tile naming rule, and returning the required map tiles. The invention can provide different types of self-defined tile data sources to the power business system in a WMS service mode, and meets the display requirement of the power GIS on high-resolution image map data.
Description
Technical Field
The invention belongs to the technical field of intelligent power GIS, and particularly relates to a realization method for expanding WMS service of a GeoServer releasing custom tile, which can meet the requirements of displaying multiple types, higher resolution and updating a time-efficient geographical base map in a power system.
Background
Along with the development of power distribution and power utilization projects and the continuous input of low-voltage equipment, the power GIS provides higher requirements for the map precision and the detail degree of the region where the project is located. The Web system develops towards a service-oriented system architecture, the GIS also gradually provides services of spatial data and spatial functions in a service mode, the cost and spatial processing resources required for displaying image map data with higher resolution under a Web environment are higher, and mechanisms such as tiling, caching, index optimization and the like are required for realizing the purpose of providing power GIS services in a lightweight and service mode.
Disclosure of Invention
Aiming at the problems, the invention provides a realization method for expanding WMS service of releasing the self-defined tiles by the GeoServer, which provides different types of self-defined tile data sources for an electric power business system in a WMS service mode following the OGC specification, realizes loose coupling of map service and the business system, and meets the display requirements of an electric power GIS on multi-type and high-resolution image map data.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
a realization method for expanding a WMS service of a GeoServer releasing custom tiles comprises the following steps:
s1: pre-downloading map tiles under different scales, and storing the map tiles in corresponding custom folders according to set tile segmentation rules, tile naming rules and organization rules to form custom tile data sources;
s2: establishing a configuration file for recording map parameter information of map tiles in a custom folder;
s3: configuring a layer corresponding to a user-defined tile data source in a data directory of the GeoServer, and storing a user-defined tile data source information file;
s4: according to a received request for acquiring a network map GetMap, firstly, analyzing a self-defined tile data source information file by using a self-defined tile data source information analysis class, and then, positioning to a self-defined tile data source needing to be read by using a self-defined tile reading class; finally, map parameter information of the map tiles is analyzed by utilizing the user-defined tile feature classes and is transmitted to a user-defined tile reading class;
s5: and the user-defined tile reading class calls a corresponding index number calculation method according to the received map parameter information, the tile slicing rule and the tile naming rule, responds to the request of acquiring the network map GetMap and returns the required map tiles.
Further, the custom tile data source is a group of map tile files with the same custom tile splitting rule, tile naming rule and organization rule, wherein the organization rule is the combination sequence of the map tiles.
Further, the custom tile data source information file comprises: xml file for defining basic description information of map tiles, tiledata. its file for defining storage path of map tiles, and tiledata. prj file for defining coordinate system of map tiles and projection information.
Further, the map parameter information includes: the map tile set comprises a coordinate range of a global map where the map tiles are located, tile row and column numbers corresponding to the global range under an initial scale level, a minimum scale level, a maximum scale level, tile pixel sizes and expansion information, wherein the expansion information comprises tile type name information and is used for distinguishing by using different tile type names when two or more groups of map tile data of different types appear.
Further, the network map GetMap request includes: layer name, requested geographical coordinate range, pixel size, requested coordinate system information.
Further, in step S4, specifically, the method includes: reading map tile basic description information, a map tile coordinate system, projection information and a map tile storage path in an info.xml file, a tiledata.its file and a tiledata.prj file by using a custom tile data source information analysis class, and positioning the read class to a custom tile data source needing to be read according to the map tile storage path information; and analyzing the configuration file of the map parameter information in the corresponding custom folder by the custom tile characteristic class, analyzing the map parameter information of the map tile, and transmitting the map parameter information to the custom tile reading class.
Further, the step S5 is specifically: the user-defined tile reading class calls a corresponding index number calculation method according to the received map parameter information, the user-defined slicing rule and the tile naming rule to obtain the conversion relation between the geographic coordinate and the tile index number and the pixel resolution of each level of scale of the tile data; the user-defined tile reading class converts a geographic coordinate range requested under a request coordinate system in the network map GetMap request into a geographic coordinate range of a map tile coordinate system in a tiledata.prj file according to parameters in the received network map GetMap request, calculates theoretical tile pixel resolution according to the geographic range and the geometric pixel range in the network map GetMap request, compares the theoretical tile pixel resolution with pixel resolution of each scale of tile data, takes the closest tile data scale as a display scale, calculates a new geographic coordinate range according to the scale resolution and the geometric pixel range, and calculates a tile index number by using the display scale and the geographic coordinate range to obtain a tile file.
The invention has the beneficial effects that:
the method and the system solve the requirements of displaying the geographic base map with higher resolution and larger data volume by the power WebGIS, expand the WebGIS server side to support the access to the user-defined tile data in a WMS service mode by pre-caching the network map tiles, reduce the dependence on the on-line commercial map API, improve the display efficiency of the power GIS and improve the user experience of the power GIS.
Drawings
FIG. 1 is a block diagram of WMS service for releasing custom tiles by an extended GeoServer;
FIG. 2 is a flowchart of configuring and parsing custom map tiles, returning to WMS for obtaining map tiles required by a network map request;
FIG. 3 is a flow chart of calculating a desired tile index number.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1-3, a method for implementing WMS service of releasing custom tiles by an extended GeoServer includes the following steps:
s1: pre-downloading map tiles under different scales, and storing the map tiles in corresponding custom folders according to set tile segmentation rules, tile naming rules and organization rules to form custom tile data sources;
the user-defined tile data source is a group of map picture files with the same user-defined tile segmentation rule, tile naming rule and organization rule, wherein the organization rule is the combination sequence of all map tiles;
s2: establishing a configuration file for recording map parameter information of map tiles in a custom folder;
the map parameter information includes: the coordinate range of the global map where the group of map tiles are located, the number of tile rows and columns corresponding to the global range under the initial scale level, the minimum scale level, the maximum scale level, the tile pixel size and the expansion information, wherein the expansion information comprises tile type name information (such as google and wordwid) used for distinguishing by using different tile type names when two or more groups of map tile data of different types appear.
S3: configuring layers corresponding to respective defined tile data sources in a data directory of the GeoServer, and storing information files of the self-defined tile data sources;
the custom tile data source information file comprises: xml file for defining basic description information of map tiles, tiledata. its file for defining storage path of map tiles, and tiledata. prj file for defining coordinate system of map tiles and projection information.
S4: according to a received request for acquiring a network map GetMap, firstly, analyzing a self-defined tile data source information file by using a self-defined tile data source information analysis class, and then, positioning to a self-defined tile data source needing to be read by using a self-defined tile reading class; finally, map parameter information of the map tiles is analyzed by utilizing the user-defined tile feature classes and is transmitted to a user-defined tile reading class;
the step S4 specifically includes: reading map tile basic description information, a map tile coordinate system, projection information and a map tile storage path in an info.xml file, a tiledata.its file and a tiledata.prj file by using a custom tile data source information analysis class, and positioning the read class to a custom tile data source needing to be read according to the map tile storage path information; analyzing a configuration file of the map parameter information in the corresponding custom folder by the custom tile feature class, analyzing the map parameter information of the map tile, and transmitting the map parameter information to the custom tile reading class;
s5: the user-defined tile reading class calls a corresponding index number calculation method according to the received map parameter information, the tile slicing rule and the tile naming rule, responds to a request for obtaining a network map GetMap, and returns the required map tiles;
the step S5 specifically includes: the user-defined tile reading class calls a corresponding index number calculation method according to the received map parameter information, the user-defined slicing rule and the tile naming rule to obtain the conversion relation between the geographic coordinate and the tile index number and the pixel resolution of each level of scale of the tile data; the user-defined tile reading class converts a geographic coordinate range requested under a request coordinate system in the network map GetMap request into a geographic coordinate range under a map tile coordinate system in a tiledata.prj file according to parameters in the received network map GetMap request, calculates theoretical tile pixel resolution according to the geographic range and the geometric pixel range in the network map GetMap request, compares the theoretical tile pixel resolution with the pixel resolution of each scale of tile data, takes the closest tile data scale as a display scale, calculates a new geographic coordinate range according to the scale resolution and the geometric pixel range, and calculates a tile index number by using the display scale and the geographic coordinate range to obtain a tile file.
The implementation process of the implementation method for expanding the WMS service of the GeoServer releasing the custom tiles is described by taking Google map tiles as an example as follows:
the custom tile data source information parsing class, the custom tile reading class, and the custom tile feature class in this embodiment are all set in a naiiimagetilesource module, where the naiiimagetilesource is a custom module.
Step 1: downloading Google map tiles under different scales in advance, wherein all the map tiles are stored in a TileMap folder to form a user-defined tile data source, and the names of the appointed map tiles are named according to the rule of 'scale level/row number/column number, png'; establishing a google folder in a coverages folder of a GeoServer data directory, and configuring an info.xml file, a tiledata.its file and a tiledata.prj file in the google folder; xml file is used for defining basic description information of map tiles, including: description information such as data name, data source and update date; the tiledata.its file is used for defining a map tile storage path, the tiledata.prj file is used for defining a map tile coordinate system and projection information, and the tiledata.prj file adopts a WKT text description mode of an EPSG system.
Step 2: establishing a configuration file config.xml for recording map parameter information of map tiles located in a TileMap folder, wherein the map parameter information comprises: the expansion information comprises tile type name information, and is used for distinguishing by using different tile type names when two or more groups of map tile data of different types appear, for example, the tile type names of the map tiles consistent with the Google map segmentation rule are defined as 'google' according to the segmentation rule, the tile type names of the map tiles consistent with the Worldwind map segmentation rule are defined as 'Worldwind', or the self-defined names are used.
And step 3: the GeoServer receives and analyzes a network map GetMap request to obtain request condition parameters, and the method specifically comprises the following steps: layer name, requested geographical coordinate range, pixel size, requested coordinate system information, and the like; when the GeoServer judges that the layer to be accessed is the self-defined tile configured in the step 1 as the data source, reading an info.xml file, a tiledata.its file and a tiledata.prj file which are established in a coverages folder in a GeoServer data directory, and reading map tile basic description information, a map tile coordinate system, projection information and a map tile storage path in the info.xml file, the tiledata.its file and the tiledata.prj file by using a self-defined tile data source information analysis class; then, positioning a custom tile data source to be read according to the map tile storage path by utilizing a custom tile reading class; then analyzing a config.xml file under the map tile storage path information through the user-defined tile feature class to obtain corresponding map parameter information, which specifically comprises the following steps: the coordinate range of the global map in which the group of map tiles are located, the number of tile rows and columns corresponding to the global range at the initial scale level, the minimum and maximum scale levels, the tile pixel size and the expansion information;
step 4, the step S5 is specifically: the user-defined tile reading class calls a corresponding index number calculation method according to the received map parameter information, the user-defined slicing rule and the tile naming rule to obtain the conversion relation between the geographic coordinate and the tile index number and the pixel resolution of each level of scale of the tile data; the user-defined tile reading class converts a geographic coordinate range requested under a request coordinate system in the network map GetMap request into a geographic coordinate range under a map tile coordinate system in a tiledata.prj file according to parameters in the received network map GetMap request, calculates theoretical tile pixel resolution according to the geographic range and the geometric pixel range in the network map GetMap request, compares the theoretical tile pixel resolution with the pixel resolution of each scale of tile data, takes the closest tile data scale as a display scale, calculates a new geographic coordinate range according to the scale resolution and the geometric pixel range, and calculates a tile index number by using the display scale and the geographic coordinate range to obtain a tile file.
For example, in config.xml of the google map tile data source, the configuration type information is "google", and the google map tile splitting rule is as follows: taking the upper left corner as an initial origin, the global map range is as follows: the x-axis value range is-20037508.3427892, 20037508.3427892, the y-axis value range is-20037508.3427892, 20037508.3427892, the tiles are divided on the square projection plane, the quantity of the global image tiles on each layer is 4 to the power of level power, namely, 1 tile on the 0 th layer, 4 tiles on the 1 st layer and 16 tiles on the second layer, and the steps are repeated in this way, so that the line number and the column number corresponding to each tile in each layer can be calculated. Google tiles are custom organized in the manner of "EPSG 900193 — scale level number/row number/column number png" when pre-download occurs. Xml of the WorldWind tile data source configures type information as 'Worldwind', and the WorldWind tile splitting rule is as follows: taking the lower left corner as the starting origin, the global map range is: -90, -180 to (90,180), each tile has a pixel size of 512 x 512, layer 0 is 10 tiles, each next layer divides the upper layer tile into four, and the WorldWind tiles are self-defined and organized in the way of 'scale level number/line number/column number. png' when pre-downloading.
When a new tile with a custom type is required to be added, as shown in the flow in fig. 2, a layer and a corresponding custom tile data source configuration file are newly added in a GeoServer data directory updates folder, a new tile file is deployed in a tile data directory, and a corresponding config. In the program part, a new type name is added and identified in a user-defined tile characteristic class, a method for calculating the segmentation and index rule of the user-defined tile is added in a user-defined tile reading class, and the calling modes of the NariImageTileSource module in the GeoServer, the user-defined tile data source information analysis class, the user-defined tile reading class and the user-defined tile characteristic class are not changed, so that the map tile data source required by customization and expansion is facilitated.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A realization method for expanding a WMS service of a GeoServer releasing custom tiles is characterized in that: the method comprises the following steps:
s1: pre-downloading map tiles under different scales, and storing the map tiles in corresponding custom folders according to set tile segmentation rules, tile naming rules and organization rules to form custom tile data sources;
s2: establishing a configuration file for recording map parameter information of map tiles in a custom folder;
s3: configuring a layer corresponding to a user-defined tile data source in a data directory of the GeoServer, and storing a user-defined tile data source information file;
s4: according to a received request for acquiring a network map GetMap, firstly, analyzing a self-defined tile data source information file by using a self-defined tile data source information analysis class, and then, positioning to a self-defined tile data source needing to be read by using a self-defined tile reading class; finally, map parameter information of the map tiles is analyzed by utilizing the user-defined tile feature classes and is transmitted to a user-defined tile reading class;
s5: the user-defined tile reading class calls a corresponding index number calculation method according to the received map parameter information, the tile slicing rule and the tile naming rule, responds to a request for obtaining a network map GetMap, and returns the required map tiles;
the custom tile data source information file comprises: an info.xml file for defining basic description information of the map tiles, a tiledata.its file for defining storage paths of the map tiles, and a tiledata.prj file for defining coordinate systems of the map tiles and projection information;
the step S4 specifically includes: reading map tile basic description information, a map tile coordinate system, projection information and a map tile storage path in an info.xml file, a tiledata.its file and a tiledata.prj file by using a self-defined tile data source information analysis class; the reading class locates a user-defined tile data source to be read according to the map tile storage path information; and analyzing the configuration file of the map parameter information in the corresponding custom folder by the custom tile characteristic class, analyzing the map parameter information of the map tile, and transmitting the map parameter information to the custom tile reading class.
2. The method for implementing the service of the extended GeoServer for publishing the custom tile WMS as claimed in claim 1, wherein: the custom tile data source is a group of map tile files with the same custom tile segmentation rule, tile naming rule and organization rule, wherein the organization rule is the combination sequence of each map tile.
3. The method for implementing the service of the extended GeoServer for publishing the custom tile WMS as claimed in claim 2, wherein: the map parameter information includes: the map tile set comprises a coordinate range of a global map where the map tiles are located, tile row and column numbers corresponding to the global range under an initial scale level, a minimum scale level, a maximum scale level, tile pixel sizes and expansion information, wherein the expansion information comprises tile type name information and is used for distinguishing by using different tile type names when two or more groups of map tile data of different types appear.
4. The implementation method of the extended GeoServer publishing custom tile WMS service as claimed in claim 3, wherein: the network map GetMap request comprises the following steps: layer name, requested geographical coordinate range, pixel size, requested coordinate system information.
5. The implementation method of the extended GeoServer publishing custom tile WMS service as claimed in claim 4, wherein: the step S5 specifically includes: the user-defined tile reading class calls a corresponding index number calculation method according to the received map parameter information, the user-defined slicing rule and the tile naming rule to obtain the conversion relation between the geographic coordinate and the tile index number and the pixel resolution of each level of scale of the tile data; the user-defined tile reading class converts a geographic coordinate range requested under a request coordinate system in the network map GetMap request into a geographic coordinate range under a map tile coordinate system in a tiledata.prj file according to parameters in the received network map GetMap request, calculates theoretical tile pixel resolution according to the geographic range and the geometric pixel range in the network map GetMap request, compares the theoretical tile pixel resolution with the pixel resolution of each scale of tile data, takes the closest tile data scale as a display scale, calculates a new geographic coordinate range according to the scale resolution and the geometric pixel range, and calculates a tile index number by using the display scale and the geographic coordinate range to obtain a tile file.
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