CN117573917A - Map picture intercepting method, system, electronic equipment and medium - Google Patents
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Abstract
The invention belongs to the technical field of map screenshot, and aims to provide a map picture intercepting method, a system, electronic equipment and a medium. According to the invention, the map picture intercepting operation is carried out by the host computer of the client, and the client is not required to render the tiles to the display, but the target map tiles are directly intercepted after the splicing treatment, so that the method and the device can be beneficial to fully utilizing the client resources, reduce the load on the host computer of the client, and solve the problem of high load on the server in the prior art. In addition, the invention can solve the problem that the map interception range is limited by the screen size in the prior art. In addition, in the invention, the target map picture is cut out on the map picture after affine transformation processing, so that the problem of deviation between the target map picture and the actual position can be avoided.
Description
Technical Field
The invention belongs to the technical field of map screenshot, and particularly relates to a map picture intercepting method, a map picture intercepting system, electronic equipment and a medium.
Background
Web GIS (Web-based Geographic Information System, geographic information system based on Web technology) is a product of the application of Internet technology to GIS development, and is an important component of modern GIS technology.
The conventional Web GIS adopts WMS (Web Map Service) of OGC (Open Geospatial Consortium, open geographic space information alliance) standard, that is, a client sends a specified geographic range to a server, the server queries and acquires geographic data within the specified geographic range, then renders the geographic data obtained by query into a Map picture at the server according to a predefined configuration style of a thematic Map, and finally returns the Map picture to the client for a user to browse. However, the scheme has the problems of low drawing speed, low efficiency and the like in the implementation process. Specifically, after the server acquires a request sent by the client and inquires about related geographic data, rendering operation and drawing of the geographic data are needed, a large amount of resources of the server can be occupied, and the load of the server is large; meanwhile, the geographical range uploaded by the client has uncertainty, and the map picture rendered by the dominant server is very large and is time-consuming to transmit through the network.
In order to solve the problems of slow drawing speed, low efficiency and the like of the traditional Web GIS, a Google (Google) company introduces a map tile technology, WMTS (Web Map Tile Service ) is provided for users, a client requests to access map tiles by cutting the map into a plurality of map tiles in advance and storing the map tiles in a server in advance, a specified geographic range is uploaded to the server, the server returns all map tiles in the specified geographic range according to related parameters, and the client downloads corresponding map tiles according to tile information and renders the map tiles on a display of the client, so that the users can quickly browse map data in the specified geographic range at the client. Based on the method, the server side inquires and returns all target map tiles in the appointed geographic range to the client side, the client side performs picture rendering, partial calculation force is transferred to the client side, the problems of limited transmission speed of the server side and the like are avoided, and the method is beneficial to improving the drawing speed and efficiency.
However, in using the prior art, the inventors have found that there are at least the following problems in the prior art:
a. after the client acquires map tiles according to the appointed geographic range, the map tiles are spliced and rendered to the display, and then screenshot is carried out through the display, at the moment, the size of the spliced map pictures is limited by the screen size of the display, the map screenshot with the ultra-large range cannot be generated, meanwhile, the client carries out picture rendering, and the problem of large occupation of resources of the client exists; b. when the client rotationally intercepts the rendered map, position deviation exists.
Disclosure of Invention
The invention aims to solve the technical problems at least to a certain extent, and provides a map picture intercepting method, a map picture intercepting system, electronic equipment and a map picture intercepting medium.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a map picture capturing method, which is executed based on a host of a client, and includes:
receiving a map picture intercepting request; the map picture intercepting request is bound with a target geographic range;
expanding the target geographic range according to a preset proportion to obtain an expanded geographic range;
acquiring all target map tiles located in the extended geographic range;
performing splicing treatment on all target map tiles to obtain a spliced map picture;
affine transformation is carried out on the spliced map pictures to obtain transformed map pictures;
and intercepting the map picture after transformation to obtain a target map picture matched with the target geographic range.
According to the invention, the map picture intercepting operation is carried out by the host computer of the client, and the client is not required to render the tiles to the display, but the target map tiles are directly intercepted after the splicing treatment, so that the method and the device can be beneficial to fully utilizing the client resources, reduce the load on the host computer of the client, and solve the problem of high load on the server in the prior art. In addition, the method and the device convert the target screenshot size in the prior art into the geographic range, acquire all corresponding target map tiles, splice all the target map tiles to obtain the spliced map picture, carry out affine transformation on the spliced map picture to obtain the transformed map picture, and finally intercept the target map picture matched with the target geographic range from the transformed map picture, thereby realizing interception of the map picture matched with the target geographic range, and solving the problem that the map interception range is limited by the screen size in the prior art. In addition, in the invention, the target map picture is cut out on the map picture after affine transformation processing, so that the problem of deviation between the target map picture and the actual position can be avoided.
In one possible design, the map picture intercept request is also bound with a specified tile hierarchy;
correspondingly, all target map tiles acquired within the extended geographic range belong to the specified tile hierarchy.
In one possible design, the specified tile level is any one of levels 0-18.
In one possible design, after acquiring all target map tiles that are within the extended geographic range, the method further includes:
and caching all target map tiles into the memory of the client.
In one possible design, the stitching process is performed on all the target map tiles to obtain a stitched map picture, including:
acquiring position information of all target map tiles;
and splicing all the target map tiles in sequence according to the position information of all the target map tiles to obtain a spliced map picture.
In a second aspect, the present invention provides a map picture capturing system, configured to implement a map picture capturing method according to any one of the above-mentioned aspects; the map picture intercepting system comprises:
the request acquisition module is used for receiving a map picture interception request; the map picture intercepting request is bound with a target geographic range;
the geographic range expansion module is in communication connection with the request acquisition module and is used for expanding the target geographic range according to a preset proportion to obtain an expanded geographic range;
the map tile acquisition module is in communication connection with the geographic range expansion module and is used for acquiring all target map tiles positioned in the expanded geographic range;
the map tile splicing module is in communication connection with the map tile acquisition module and is used for carrying out splicing treatment on all target map tiles to obtain a spliced map picture;
the picture conversion module is in communication connection with the map tile splicing module and is used for carrying out affine transformation on the spliced map pictures to obtain transformed map pictures;
and the picture intercepting module is in communication connection with the picture transformation module and is used for intercepting and obtaining a target map picture matched with the target geographic range from the transformed map picture.
In a third aspect, the present invention provides an electronic device, comprising:
a memory for storing computer program instructions; the method comprises the steps of,
a processor for executing the computer program instructions to perform the operations of the map picture interception method as set forth in any one of the preceding claims.
In a fourth aspect, the present invention provides a computer readable storage medium storing computer program instructions readable by a computer, the computer program instructions being configured to perform operations of the map picture interception method as claimed in any one of the above.
Drawings
Fig. 1 is a flowchart of a map picture capturing method in embodiment 1;
fig. 2 is a flow chart of the target map picture capturing in embodiment 1;
FIG. 3 is a schematic diagram of the embodiment 1, based on the transformed map picture, showing the target geographic area, the extended geographic area, and the tile-stitched geographic area;
FIG. 4 is a block diagram of a map picture capture system in an embodiment;
fig. 5 is a block diagram of an electronic device in an embodiment.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the drawings is only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art. It should be noted that the description of these examples is for aiding in understanding the present invention, but is not intended to limit the present invention.
Example 1:
the embodiment discloses a map picture intercepting method, which can be executed by a computer device or a virtual machine with certain computing resources, for example, an electronic device such as a personal computer, a smart phone, a personal digital assistant or a wearable device, or a virtual machine.
As shown in fig. 1, a map picture capturing method, which is executed based on a host of a client, may include, but is not limited to, the following steps:
s1, receiving a map picture interception request; the map picture intercepting request is bound with a target geographic range; it should be noted that, the target geographic range is a plurality of coordinate information that can refer to the designated area in the map picture, and the designated area in the map picture can be uniquely obtained according to the target geographic range.
S2, expanding the target geographic range according to a preset proportion to obtain an expanded geographic range; in the present embodiment, the preset ratio is, for example, 1.2 to 1.5, and the present invention is not limited thereto.
S3, acquiring all target map tiles located in the extended geographic range from a server.
Because the map tiles are stored in the server side in advance, the size of the map tiles is relatively fixed, so that the client side cannot intercept finer map tile spliced map pictures in the same geographic range, and in order to solve the technical problem, the embodiment further makes the following improvements: the map picture intercepting request is also bound with a designated tile level;
correspondingly, all target map tiles acquired within the extended geographic range belong to the specified tile hierarchy.
Based on the setting, in the implementation process, when a user sends a map picture interception request, the user can bind and specify the tile level according to own requirements, so that the map picture with any precision positioned in the target geographic range can be intercepted conveniently, when the client receives the target geographic range selected by the user, the client can synchronously specify the tile level to splice and cut the map picture in the target geographic range, and the problem that the map tile spliced picture finer under the same geographic range cannot be intercepted in the prior art can be solved.
In this embodiment, the specified tile level is any one of levels 0-18. It should be noted that, the optional levels of the designated tile levels are determined according to the tile level configuration of the server, and the designated tile levels determine the definition requirement of the intercepted map picture by the user, so that the higher the designated tile level is, the clearer the intercepted map picture is.
If the user modifies the geographical range, the server needs to re-render the data, the rendered map picture cannot be reused, and resource waste exists; to solve this problem, in this embodiment, after acquiring all the target map tiles located in the extended geographic range, the method further includes:
A. and caching all target map tiles into the memory of the client.
In this embodiment, when all the target map tiles are spliced, the splicing process may be directly performed in the memory of the client, so that the load on the host of the client may be further reduced. Meanwhile, after the map tiles are cached to the local memory, the map tiles can be reused, repeated downloading of the map tiles is avoided, and the cost required by picture splicing is greatly reduced.
S4, performing splicing treatment on all the target map tiles to obtain a spliced map picture; it should be noted that, in this embodiment, the geographical range after tile splicing of the map picture after splicing may also be obtained according to the position information of all the target map tiles. Since the target map tile is a map tile within an extended geographic range, the geographic range after tile stitching is also significantly greater than the target geographic range.
In this embodiment, performing a stitching process on all target map tiles to obtain a stitched map picture, including:
s401, acquiring position information of all target map tiles; when all the target map tiles located in the extended geographic range are acquired from the server, the target map tiles are bound with the corresponding position information, and based on the target map tiles, the splicing of all the target map tiles can be realized.
S402, splicing all the target map tiles in sequence according to the position information of all the target map tiles to obtain a spliced map picture.
Specifically, in this embodiment, the position information of the map tiles adopts rank numbers matched with the map coordinates, for example, (1, 1), (1, 2), and the like, and when all the target map tiles are spliced in sequence according to the position information of all the target map tiles, the map tiles are spliced in sequence according to ranks of all the target map tiles.
S5, carrying out affine transformation on the spliced map pictures to obtain transformed map pictures; it should be noted that, the map tile is generated by clipping based on the Pseudo Mercator (Pseudo Mercator projection), and in this embodiment, the deformation of the finally obtained target map picture in the target geographic range can be eliminated by affine transformation processing.
S6, intercepting the map picture after transformation to obtain a target map picture matched with the target geographic range.
Specifically, in this embodiment, capturing a target map picture matched with the target geographic range from the transformed map picture includes:
s601, calculating a coincident geographical range of the target geographical range and the tile spliced geographical range;
s602, according to the coincident geographic range, a target map picture is obtained by intercepting the map picture after transformation.
As an example, a schematic flow chart of capturing a target map picture is given in fig. 2 of the present embodiment, which includes a flow of acquiring a plurality of target map tiles, stitching all the target map tiles to obtain a stitched map picture, performing affine transformation operation on the stitched map picture to obtain a transformed map picture, and capturing the target map picture from the transformed map picture, wherein a dashed box indicates a target geographical range.
Further, fig. 3 shows a schematic diagram based on the transformed map picture, which can indicate the target geographic range, the extended geographic range and the geographic range after tile stitching, and in the prior art, map tiles A6, A7, a10 and a11 in the target geographic range form the intercepted target map picture. However, since the map tiles are generated by clipping based on the Pseudo Mercator (Pseudo Mercator projection) principle, such as direct clipping, there is a problem that the target map picture and the actual map picture are not matched in shape. Therefore, in this embodiment, affine transformation is performed on the picture to obtain the transformed map picture, so that the problem of picture deformation can be eliminated. If the image matched with the target geographic range is directly intercepted from the transformed map image, the problem that the intercepted target map image has a missing image is caused, and the use condition cannot be met. Based on this, in this embodiment, before affine transformation is performed on the picture, the target geographic range is expanded in advance according to a preset proportion to obtain an expanded geographic range, then all target map tiles located in the expanded geographic range, namely map tiles A1-a16, are acquired from a server, then map tiles A1-a16 are spliced to obtain a spliced map picture, and finally a target map picture matched with the target geographic range is obtained from the map picture after conversion, namely a picture located in the target geographic range in the map picture after conversion.
According to the embodiment, the map picture intercepting operation is carried out by the host computer which is used for lowering the map picture intercepting operation to the client, the client is not required to render the tiles to the display, the target map tiles are intercepted after being spliced, the client resource can be fully utilized, the load on the client host computer is reduced, and the problem that the load on the server is large in the prior art can be solved. In addition, the embodiment converts the size of the target screenshot in the prior art into the geographic range, acquires all corresponding target map tiles, performs splicing processing on all the target map tiles to obtain a spliced map picture, performs affine transformation on the spliced map picture to obtain a transformed map picture, and finally intercepts the transformed map picture to obtain a target map picture matched with the target geographic range, thereby realizing the interception of the map picture matched with the target geographic range, and solving the problem that the interception range of the map is limited by the screen size in the prior art. In addition, in the embodiment, the target map picture is cut out from the map picture after affine transformation processing, so that the problem that the target map picture deviates from the actual position can be avoided.
Example 2:
the embodiment discloses a map picture intercepting system, which is used for realizing the map picture intercepting method in the embodiment 1; as shown in fig. 4, the map picture intercepting system includes:
the request acquisition module is used for receiving a map picture interception request; the map picture intercepting request is bound with a target geographic range;
the geographic range expansion module is in communication connection with the request acquisition module and is used for expanding the target geographic range according to a preset proportion to obtain an expanded geographic range;
the map tile acquisition module is in communication connection with the geographic range expansion module and is used for acquiring all target map tiles positioned in the expanded geographic range;
the map tile splicing module is in communication connection with the map tile acquisition module and is used for carrying out splicing treatment on all target map tiles to obtain a spliced map picture;
the picture conversion module is in communication connection with the map tile splicing module and is used for carrying out affine transformation on the spliced map pictures to obtain transformed map pictures;
and the picture intercepting module is in communication connection with the picture transformation module and is used for intercepting and obtaining a target map picture matched with the target geographic range from the transformed map picture.
It should be noted that, the working process, working details and technical effects of the map picture capturing system provided in embodiment 2 can be referred to embodiment 1, and are not described herein.
Example 3:
on the basis of embodiment 1 or 2, this embodiment discloses an electronic device, which may be a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like. The electronic device may be referred to as a user terminal, a portable terminal, a desktop terminal, etc., as shown in fig. 5, the electronic device includes:
a memory for storing computer program instructions; the method comprises the steps of,
a processor configured to execute the computer program instructions to perform the operations of the map picture interception method according to any one of embodiment 1.
In particular, processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The processor 301 may be implemented in at least one hardware form of DSP (Digital Signal Processing ), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array ). The processor 301 may also include a main processor, which is a processor for processing data in an awake state, also called a CPU (Central Processing Unit ), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 301 may be integrated with a GPU (Graphics Processing Unit, image processor) for taking care of rendering and drawing of content that the display screen is required to display.
Memory 302 may include one or more computer-readable storage media, which may be non-transitory. Memory 302 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 302 is used to store at least one instruction for execution by processor 301 to implement the map picture interception method provided by embodiment 1 in the present application.
In some embodiments, the terminal may further optionally include: a communication interface 303, and at least one peripheral device. The processor 301, the memory 302 and the communication interface 303 may be connected by a bus or signal lines. The respective peripheral devices may be connected to the communication interface 303 through a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of radio frequency circuitry 304, a display screen 305, and a power supply 306.
The communication interface 303 may be used to connect at least one peripheral device associated with an I/O (Input/Output) to the processor 301 and the memory 302. In some embodiments, processor 301, memory 302, and communication interface 303 are integrated on the same chip or circuit board; in some other embodiments, either or both of the processor 301, the memory 302, and the communication interface 303 may be implemented on separate chips or circuit boards, which is not limited in this embodiment.
The Radio Frequency circuit 304 is configured to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuitry 304 communicates with a communication network and other communication devices via electromagnetic signals.
The display screen 305 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof.
The power supply 306 is used to power the various components in the electronic device.
Example 4:
on the basis of any one of embodiments 1 to 3, this embodiment discloses a computer-readable storage medium for storing computer-readable computer program instructions configured to perform the operations of the map picture capturing method described in embodiment 1 when executed.
It will be apparent to those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, or they may alternatively be implemented in program code executable by computing devices, such that they may be stored in a memory device for execution by the computing devices, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solution of the present invention, and not limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents. Such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A map picture intercepting method is characterized in that: a client-based host execution, the method comprising:
receiving a map picture intercepting request; the map picture intercepting request is bound with a target geographic range;
expanding the target geographic range according to a preset proportion to obtain an expanded geographic range;
acquiring all target map tiles located in the extended geographic range;
performing splicing treatment on all target map tiles to obtain a spliced map picture;
affine transformation is carried out on the spliced map pictures to obtain transformed map pictures;
and intercepting the map picture after transformation to obtain a target map picture matched with the target geographic range.
2. The map picture capturing method according to claim 1, wherein: the map picture intercepting request is also bound with a designated tile level;
correspondingly, all target map tiles acquired within the extended geographic range belong to the specified tile hierarchy.
3. The map picture capturing method according to claim 2, characterized in that: the specified tile level is any one of levels 0-18.
4. The map picture capturing method according to claim 1, wherein: after obtaining all target map tiles located within the extended geographic range, the method further includes:
and caching all target map tiles into the memory of the client.
5. The map picture capturing method according to claim 1, wherein: performing splicing processing on all target map tiles to obtain a spliced map picture, wherein the splicing processing comprises the following steps:
acquiring position information of all target map tiles;
and splicing all the target map tiles in sequence according to the position information of all the target map tiles to obtain a spliced map picture.
6. A map picture intercepting system, characterized in that: for implementing the map picture interception method according to any one of claims 1 to 5; the map picture intercepting system comprises:
the request acquisition module is used for receiving a map picture interception request; the map picture intercepting request is bound with a target geographic range;
the geographic range expansion module is in communication connection with the request acquisition module and is used for expanding the target geographic range according to a preset proportion to obtain an expanded geographic range;
the map tile acquisition module is in communication connection with the geographic range expansion module and is used for acquiring all target map tiles positioned in the expanded geographic range;
the map tile splicing module is in communication connection with the map tile acquisition module and is used for carrying out splicing treatment on all target map tiles to obtain a spliced map picture;
the picture conversion module is in communication connection with the map tile splicing module and is used for carrying out affine transformation on the spliced map pictures to obtain transformed map pictures;
and the picture intercepting module is in communication connection with the picture transformation module and is used for intercepting and obtaining a target map picture matched with the target geographic range from the transformed map picture.
7. An electronic device, characterized in that: comprising the following steps:
a memory for storing computer program instructions; the method comprises the steps of,
a processor for executing the computer program instructions to perform the operations of the map picture interception method of any one of claims 1 to 5.
8. A computer readable storage medium storing computer program instructions readable by a computer, characterized by: the computer program instructions are configured to perform the operations of the map picture interception method of any one of claims 1 to 5 when run.
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