CN115618031A - Remote sensing image tile sending method and device - Google Patents
Remote sensing image tile sending method and device Download PDFInfo
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- CN115618031A CN115618031A CN202211057337.7A CN202211057337A CN115618031A CN 115618031 A CN115618031 A CN 115618031A CN 202211057337 A CN202211057337 A CN 202211057337A CN 115618031 A CN115618031 A CN 115618031A
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- G06F16/50—Information retrieval; Database structures therefor; File system structures therefor of still image data
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Abstract
The invention discloses a method and a device for sending a tile of a remote sensing image. The method comprises the following steps: receiving a tile obtaining request sent by a user; responding to the tile obtaining request, and judging whether a target remote sensing image tile matched with the tile obtaining request exists in a cache layer or not; under the condition that the target remote sensing image tile does not exist in the cache layer, slicing the target satellite remote sensing image to obtain the target remote sensing image tile; and sending the target remote sensing image tile to the user. The method and the device do not need to be sliced in advance, the time consumed for online of the image is short, the image can be immediately released and online after production is completed, high timeliness of the online image is guaranteed, only tiles requested by a user are stored, and particularly when the method and the device are oriented to mass data, on the basis of guaranteeing the access performance of the user, server resources are greatly saved.
Description
Technical Field
The invention relates to the technical field of remote sensing image processing, in particular to a remote sensing image tile sending method and device.
Background
The development process of the remote sensing image data release can be divided into three stages: the first stage is to provide image download to the user; the second stage is to provide image browsing, such as google earth, satellite image base map of various electrons; and the third stage is to provide image services for users, such as data and information acquisition services of Google earth engines and sentinel series satellite scientific research data centers.
At present, in the rapid development period of the third stage of the world, in a new round of digital transformation wave of industrial internet transformation and new digital infrastructure, in order to get rid of the limitation of the traditional service chain on the image delivery efficiency and the service efficiency, the satellite remote sensing application industry develops a way of utilizing internet data service to build an internet remote sensing cloud platform remote sensing release service, and provides the accurate and efficient remote sensing data service which is obtained by what you see is what you get to the user in a remote sensing image data stream mode.
The existing internet remote sensing cloud platform image publishing service adopts a slice publishing mode, and the specific implementation mode is as follows: tiles under all zoom levels of the image are pre-divided into tile file sets and then issued, and tile files are indexed in the existing tile file sets by the server cluster and returned when a user requests the tile files.
With the development of the remote sensing industry, the user puts forward higher level requirements on the coverage degree and the updating frequency of the remote sensing image, and the image publishing mode of the original slice publishing has some disadvantages:
(1) The set of all tiles needs to be segmented in advance, and the link is time-consuming, so that the first link of an image release service in a service chain is in a bad situation of low-efficiency operation, and the timeliness is difficult to guarantee;
(2) Meanwhile, in the face of mass data at PB level, all tile file sets are difficult to support by server resources, and only by means of continuous server and storage superposition, the operation and maintenance cost is not reduced, and the expansion is difficult.
Disclosure of Invention
The invention solves the technical problems that: the method and the device for sending the remote sensing image tiles overcome the defects of the prior art.
The technical solution of the invention is as follows:
in a first aspect, an embodiment of the present invention provides a method for sending remote sensing image tiles, including:
receiving a tile obtaining request sent by a user;
responding to the tile obtaining request, and judging whether a target remote sensing image tile matched with the tile obtaining request exists in a cache layer or not;
under the condition that the target remote sensing image tile does not exist in the cache layer, slicing the target satellite remote sensing image to obtain the target remote sensing image tile;
and sending the target remote sensing image tile to the user.
Optionally, after the determining whether the cache layer has the target remote sensing image tile matched with the tile obtaining request, the method further includes:
under the condition that the target remote sensing image tile exists in the cache layer, extracting the target remote sensing image tile from the cache layer;
and sending the target remote sensing image tile to the user.
Optionally, the tile obtaining request includes: the range of the target tile or tiles,
the slicing processing is carried out on the target satellite remote sensing image to obtain the target remote sensing image tile, and the slicing processing comprises the following steps:
and slicing the target satellite remote sensing image according to the target tile range to obtain the target remote sensing image tile.
Optionally, the sending the target remote sensing image tile to the user includes:
and sending the target remote sensing image tile to the user in an asynchronous processing mode, and storing the target remote sensing image tile to the cache layer.
Optionally, after the saving the target remote sensing image tile to the cache layer, the method further includes:
setting a cache expiration policy of the target remote sensing image tile;
and deleting the target remote sensing image tile from the cache layer under the condition that the cache expiration policy is met.
Optionally, the deleting the target remote sensing image tile from the cache layer if the cache expiration policy is satisfied includes:
deleting the target remote sensing image tile from the cache layer under the condition that the storage time of the target remote sensing image tile in the cache layer reaches a time threshold; or
And deleting the target remote sensing image tile from the cache layer under the condition that the access times corresponding to the target remote sensing image tile reach a time threshold value.
In a second aspect, an embodiment of the present invention provides a tile sending device for remote sensing images, including:
a tile obtaining request receiving module, configured to receive a tile obtaining request sent by a user;
the target image tile judgment module is used for responding to the tile acquisition request and judging whether a target remote sensing image tile matched with the tile acquisition request exists in a cache layer or not;
the target image tile obtaining module is used for slicing a target satellite remote sensing image under the condition that the target remote sensing image tile does not exist in the cache layer to obtain the target remote sensing image tile;
and the target image tile sending module is used for sending the target remote sensing image tile to the user.
Optionally, the apparatus further comprises:
the target image tile extraction module is used for extracting the target remote sensing image tile from the cache layer under the condition that the target remote sensing image tile exists in the cache layer;
and the remote sensing image tile sending module is used for sending the target remote sensing image tile to the user.
Optionally, the tile obtaining request includes: the range of the target tile or tiles,
the target image tile acquisition module comprises:
and the target image tile obtaining unit is used for slicing the target satellite remote sensing image according to the target tile range to obtain the target remote sensing image tile.
Optionally, the target image tile sending module includes:
and the target image tile storage unit is used for sending the target remote sensing image tile to the user in an asynchronous processing mode and storing the target remote sensing image tile to the cache layer.
Optionally, the apparatus further comprises:
the cache expiration policy setting module is used for setting a cache expiration policy of the target remote sensing image tile;
and the target image tile deleting module is used for deleting the target remote sensing image tile from the cache layer under the condition that the cache expiration policy is met.
Optionally, the target image tile deletion module includes:
the first image tile deleting unit is used for deleting the target remote sensing image tile from the cache layer under the condition that the storage duration of the target remote sensing image tile in the cache layer reaches a duration threshold;
and the second image tile deleting unit is used for deleting the target remote sensing image tile from the cache layer under the condition that the access times corresponding to the target remote sensing image tile reach a time threshold value.
Compared with the prior art, the invention has the advantages that: according to the scheme provided by the embodiment of the invention, the tile obtaining request sent by the user is received, the tile obtaining request is responded, whether the target remote sensing image tile matched with the tile obtaining request exists in the cache layer or not is judged, the target satellite remote sensing image is sliced under the condition that the target remote sensing image tile does not exist in the cache layer, the target remote sensing image tile is obtained, and the target remote sensing image tile is sent to the user. By adopting the scheme provided by the embodiment of the invention, pre-slicing is not needed, the time consumed for online production of the image is short, the image can be immediately released online after production is finished, and the high timeliness of the online image is ensured. Meanwhile, by adopting a scheme of dynamic slicing, only tiles requested by a user are stored, and particularly when the tile is oriented to mass data, on the basis of ensuring the access performance of the user, the server resources are greatly saved.
Drawings
Fig. 1 is a flowchart illustrating steps of a tile transmission method for remote sensing images according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a remote sensing image tile publishing process according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a remote sensing image tile sending device according to an embodiment of the present invention.
Detailed Description
Example one
Referring to fig. 1, a flowchart illustrating steps of a method for sending remote sensing image tiles according to an embodiment of the present invention is shown, and as shown in fig. 1, the method for sending remote sensing image tiles may include the following steps:
step 101: and receiving a tile obtaining request sent by a user.
In the embodiment of the invention, through the image publishing service of dynamic slicing and quick publishing, the remote sensing image can be requested by the user after being directly online through the image online module, and the high timeliness of the image from production to user access is ensured.
The embodiment of the invention can be applied to the remote sensing image publishing server, namely, the execution main body is the remote sensing image publishing server.
The tile obtaining request refers to a request sent by a user for requesting a remote sensing image tile.
When a user wants to obtain a remote sensing image tile in a certain range, a tile obtaining request can be sent by the user. As shown in fig. 2, the user may send a user request to the remote sensing image distribution service.
After receiving the tile obtaining request sent by the user, step 102 is executed.
Step 102: and responding to the tile obtaining request, and judging whether a target remote sensing image tile matched with the tile obtaining request exists in a cache layer.
After receiving a tile obtaining request sent by a user, judging whether a target remote sensing image tile matched with the tile obtaining request exists in a cache layer or not in response to the tile obtaining request. Specifically, the tile obtaining request includes a target range (i.e., a target geographic range), the remote sensing image tile stored in the cache layer corresponds to the geographic range, after the tile obtaining request sent by the user is received, the tile obtaining request may be analyzed to obtain the target range included in the tile obtaining request, and whether the cache layer has the target remote sensing image tile corresponding to the target range is determined according to the target range. As shown in fig. 2, after receiving a user request, it may be determined whether a demand tile exists in the cache layer, and if the cache is hit, a target tile is extracted and fed back to the user.
Remote sensing image tiles of different satellite remote sensing images are pre-stored in the cache layer, as shown in fig. 2, an image online module is arranged at a remote sensing image publishing server, and the image online module can perform online publishing processing on the image tiles of the remote sensing images so as to publish the image tiles to a plurality of web servers. In this embodiment, the remote-sensing image publishing server provides functional entries of failure retry, progress monitoring, job scheduling and manual intervention by establishing an automatic link for image data production, pushing and online warehousing, so that the stability of an image data source is guaranteed for a service engine.
If the target remote sensing image tile matched with the tile obtaining request exists in the cache layer, the target remote sensing image tile matched with the tile obtaining request can be extracted from the cache layer, and the target remote sensing image tile is sent to the user.
And if the target remote sensing image tile matched with the tile obtaining request does not exist in the cache layer, executing step 103.
Step 103: and under the condition that the target remote sensing image tile does not exist in the cache layer, slicing the target satellite remote sensing image to obtain the target remote sensing image tile.
And after judging that the target remote sensing image tile matched with the tile obtaining request does not exist in the cache layer, slicing the target satellite remote sensing image to obtain the target remote sensing image tile. The implementation can be described in detail in conjunction with the following specific implementation.
In a specific implementation manner of the present invention, the tile obtaining request includes: the target tile range, step 103 may include:
substep A1: and slicing the target satellite remote sensing image according to the target tile range to obtain a target remote sensing image tile.
In this embodiment, the target tile range refers to the geographical range of the remote sensing image tile to be acquired.
After the tile obtaining request is obtained, the tile obtaining request can be analyzed to obtain a target tile range, and then the target satellite remote sensing image can be sliced according to the target tile range to obtain a target remote sensing image tile. Specifically, a dynamic slicing module is arranged in the system, when no demand tile exists in the cache layer, a dynamic slicing processing flow is performed to obtain a coordinate range of the demand tile, and then a target image and a tile in the target range, namely a target remote sensing image tile, are dynamically cut out by the dynamic slicing module. As shown in fig. 2, if the cache misses, a dynamic slicing module is called to perform dynamic slicing processing on the target satellite remote sensing image to obtain a target tile.
In this example, the dynamic slicing module may provide a very flexible slicing interface, read a partial region of the target image according to the coordinate range, dynamically slice the target image according to the required region, and return the target tile.
According to the scheme provided by the embodiment of the invention, pre-slicing is not needed, the time consumed for online production of the image is short, the image can be immediately released online after production is finished, and the high timeliness of the online image is ensured.
Step 104: and sending the target remote sensing image tile to the user.
After the target remote sensing image tile is cut out dynamically, the target remote sensing image tile can be sent to a user. In this embodiment, the sending and storing of the target remote sensing image tile may be performed in an asynchronous processing manner, that is, the target remote sensing image tile is sent to the user and the target remote sensing image tile is stored in the cache layer synchronously, specifically, the target remote sensing image tile may be sent to the user by calling a first thread, and the target remote sensing image tile may be stored in the cache layer by calling a second thread. The embodiment of the invention can improve the processing efficiency of the dynamically cut tiles by adopting an asynchronous processing mode. Meanwhile, the scheme of dynamic slicing only stores tiles requested by a user, and particularly greatly saves server resources on the basis of guaranteeing the access performance of the user when the scheme is oriented to mass data.
In this embodiment, while the dynamically cut-out target remote sensing image tile is stored in the cache layer, a cache expiration policy of the target remote sensing image tile may also be set, and specifically, the following specific implementation manner may be described in detail.
In a specific implementation manner of the present invention, the cache expiration policy setting scheme may include the following steps:
step B1: and setting a cache expiration policy of the target remote sensing image tile.
In this embodiment, after saving the dynamically cut target remote sensing image tile to the cache layer, a cache expiration policy of the target remote sensing image tile may be set, where the cache expiration policy may include: at least one of a duration policy and a number of accesses policy.
And B2, after the cache expiration policy of the target remote sensing image tile is set, executing.
And step B2: and deleting the target remote sensing image tile from the cache layer under the condition that the cache expiration policy is met.
After the cache expiration policy of the target remote sensing image tile is set, the target remote sensing image tile can be deleted from the cache layer under the condition that the cache expiration policy is met. Specifically, the target remote sensing image tile can be deleted from the cache layer when the storage duration of the target remote sensing image tile in the cache layer reaches the duration threshold. Or deleting the target remote sensing image tile from the cache layer under the condition that the access frequency corresponding to the target remote sensing image tile reaches a frequency threshold value.
The tile cache module dynamically and flexibly caches the tiles accessed by the user on a cache layer, so that the access performance of the user is improved; meanwhile, a cache expiration strategy is set, so that occupied resources of the tiles which are not frequently accessed are cleared, and the reading efficiency of a cache layer is guaranteed. The tile cache module greatly saves the resource occupation condition under the mass data and saves the storage cost on the premise of ensuring the house service performance.
According to the embodiment of the invention, the cache expiration strategy is set to release the space of the cache layer in real time, so that a full link for data automatic operation can be established, and the cost is further saved.
In this embodiment, the publishing server may further include an image service module, and the image service module may provide a service entry for a user, and distribute a user request to different nodes in the image Web server cluster through load balancing, so as to improve concurrency and throughput of image service users, avoid a single point of failure, and improve overall robustness of a service.
Example two
Referring to fig. 3, a schematic structural diagram of a remote sensing image tile sending apparatus according to an embodiment of the present invention is shown, and as shown in fig. 3, the remote sensing image tile sending apparatus 300 may include the following modules:
a tile obtaining request receiving module 310, configured to receive a tile obtaining request sent by a user;
a target image tile judgment module 320, configured to respond to the tile obtaining request, and judge whether a cache layer has a target remote sensing image tile matching the tile obtaining request;
a target image tile obtaining module 330, configured to slice a target satellite remote sensing image to obtain a target remote sensing image tile when the target remote sensing image tile does not exist in the cache layer;
and a target image tile sending module 340, configured to send the target remote sensing image tile to the user.
Optionally, the apparatus further comprises:
the target remote sensing image tile extraction module is used for extracting the target remote sensing image tile from the cache layer under the condition that the target remote sensing image tile exists in the cache layer;
and the remote sensing image tile sending module is used for sending the target remote sensing image tile to the user.
Optionally, the tile obtaining request includes: the range of the target tile or tiles,
target image tile obtaining module 330 includes:
and the target image tile obtaining unit is used for slicing the target satellite remote sensing image according to the target tile range to obtain the target remote sensing image tile.
Optionally, target image tile sending module 340 includes:
and the target image tile storage unit is used for sending the target remote sensing image tile to the user in an asynchronous processing mode and storing the target remote sensing image tile to the cache layer.
Optionally, the apparatus further comprises:
the cache expiration policy setting module is used for setting a cache expiration policy of the target remote sensing image tile;
and the target image tile deleting module is used for deleting the target remote sensing image tile from the cache layer under the condition that the cache expiration policy is met.
Optionally, the target image tile deletion module includes:
the first image tile deleting unit is used for deleting the target remote sensing image tile from the cache layer under the condition that the storage duration of the target remote sensing image tile in the cache layer reaches a duration threshold;
and the second image tile deleting unit is used for deleting the target remote sensing image tile from the cache layer under the condition that the access times corresponding to the target remote sensing image tile reach a time threshold value.
The detailed description set forth herein may provide those skilled in the art with a more complete understanding of the present application, and is not intended to limit the present application in any way. Thus, it will be appreciated by those skilled in the art that modifications or equivalents may still be made to the present application; all technical solutions and modifications thereof which do not depart from the spirit and technical essence of the present application should be covered by the scope of protection of the present patent application.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (12)
1. A tile sending method for remote sensing images is characterized by comprising the following steps:
receiving a tile obtaining request sent by a user;
responding to the tile obtaining request, and judging whether a target remote sensing image tile matched with the tile obtaining request exists in a cache layer or not;
slicing the target satellite remote sensing image to obtain a target remote sensing image tile under the condition that the target remote sensing image tile does not exist in the cache layer;
and sending the target remote sensing image tile to the user.
2. The method of claim 1, wherein after determining whether a target remote sensing image tile exists in the cache layer that matches the tile obtaining request, the method further comprises:
under the condition that the target remote sensing image tile exists in the cache layer, extracting the target remote sensing image tile from the cache layer;
and sending the target remote sensing image tile to the user.
3. The method of claim 1, wherein the tile obtaining request comprises: the range of the target tile or tiles,
the slicing processing is carried out on the target satellite remote sensing image to obtain the target remote sensing image tile, and the slicing processing comprises the following steps:
and slicing the target satellite remote sensing image according to the target tile range to obtain the target remote sensing image tile.
4. The method of claim 1, wherein said sending said target remote sensing image tile to said user comprises:
and sending the target remote sensing image tile to the user in an asynchronous processing mode, and storing the target remote sensing image tile to the cache layer.
5. The method of claim 4, wherein after said saving said target remote sensing image tile to said cache layer, further comprising:
setting a cache expiration policy of the target remote sensing image tile;
and deleting the target remote sensing image tile from the cache layer under the condition that the cache expiration policy is met.
6. The method of claim 5, wherein said deleting the target remote sensing image tile from the cache tier if the cache expiration policy is satisfied comprises:
deleting the target remote sensing image tile from the cache layer under the condition that the storage time of the target remote sensing image tile in the cache layer reaches a time threshold; or
And deleting the target remote sensing image tile from the cache layer under the condition that the access times corresponding to the target remote sensing image tile reach a time threshold value.
7. A tile transmission apparatus for remote sensing images, comprising:
a tile obtaining request receiving module, configured to receive a tile obtaining request sent by a user;
the target image tile judging module is used for responding to the tile obtaining request and judging whether a target remote sensing image tile matched with the tile obtaining request exists in the cache layer or not;
the target image tile obtaining module is used for slicing the target satellite remote sensing image to obtain a target remote sensing image tile under the condition that the target remote sensing image tile does not exist in the cache layer;
and the target image tile sending module is used for sending the target remote sensing image tile to the user.
8. The apparatus of claim 7, further comprising:
the target image tile extraction module is used for extracting the target remote sensing image tile from the cache layer under the condition that the target remote sensing image tile exists in the cache layer;
and the remote sensing image tile sending module is used for sending the target remote sensing image tile to the user.
9. The apparatus of claim 7, wherein the tile obtain request comprises: the range of the target tile or tiles,
the target image tile obtaining module comprises:
and the target image tile obtaining unit is used for slicing the target satellite remote sensing image according to the target tile range to obtain the target remote sensing image tile.
10. The apparatus of claim 7, wherein the target image tile sending module comprises:
and the target image tile storage unit is used for sending the target remote sensing image tile to the user in an asynchronous processing mode and storing the target remote sensing image tile to the cache layer.
11. The apparatus of claim 10, further comprising:
the cache expiration policy setting module is used for setting a cache expiration policy of the target remote sensing image tile;
and the target image tile deleting module is used for deleting the target remote sensing image tile from the cache layer under the condition that the cache expiration policy is met.
12. The apparatus of claim 11, wherein the target image tile deletion module comprises:
the first image tile deleting unit is used for deleting the target remote sensing image tile from the cache layer under the condition that the storage duration of the target remote sensing image tile in the cache layer reaches a duration threshold;
and the second image tile deleting unit is used for deleting the target remote sensing image tile from the cache layer under the condition that the access times corresponding to the target remote sensing image tile reach a time threshold value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117221336A (en) * | 2023-11-08 | 2023-12-12 | 江西省水利科学院(江西省大坝安全管理中心、江西省水资源管理中心) | Remote sensing image release method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117221336A (en) * | 2023-11-08 | 2023-12-12 | 江西省水利科学院(江西省大坝安全管理中心、江西省水资源管理中心) | Remote sensing image release method and system |
| CN117221336B (en) * | 2023-11-08 | 2024-01-30 | 江西省水利科学院(江西省大坝安全管理中心、江西省水资源管理中心) | Remote sensing image release method and system |
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