CN113342916B - Geographic tag image file format data processing method and device and electronic equipment - Google Patents

Geographic tag image file format data processing method and device and electronic equipment Download PDF

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CN113342916B
CN113342916B CN202110695954.9A CN202110695954A CN113342916B CN 113342916 B CN113342916 B CN 113342916B CN 202110695954 A CN202110695954 A CN 202110695954A CN 113342916 B CN113342916 B CN 113342916B
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image file
file format
target
format data
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CN113342916A (en
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董颐
李春江
常禹
张立本
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Aerial Photogrammetry and Remote Sensing Co Ltd
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Aerial Photogrammetry and Remote Sensing Co Ltd
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    • G—PHYSICS
    • 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
    • G06F16/29—Geographical information databases
    • G—PHYSICS
    • 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
    • G06F16/24—Querying
    • G06F16/245—Query processing
    • G06F16/2457—Query processing with adaptation to user needs
    • G—PHYSICS
    • 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
    • G06F16/24—Querying
    • G06F16/248—Presentation of query results

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  • Remote Sensing (AREA)
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Abstract

The application provides a geographic tag image file format data processing method and device and electronic equipment, and relates to the technical field of geographic information data processing. The method comprises the following steps: receiving a data access request, wherein the data access request is used for requesting to access target GeoTIFF data, the request comprises identification of attribute information of the GeoTIFF data, the attribute information of the target GeoTIFF data is queried according to the identification of the attribute information of the target GeoTIFF data, return GeoTIFF data corresponding to the target GeoTIFF data is read according to the attribute information of the target GeoTIFF data, and the return GeoTIFF data is sent. In the above steps, the target GeoTIFF data is read through the attribute information of the target GeoTIFF data, so that the resources of the processing equipment are saved, and the success rate and the efficiency of the GeoTIFF data processing request are improved.

Description

Geographic tag image file format data processing method and device and electronic equipment
Technical Field
The application relates to the technical field of geographic information data processing, in particular to a geographic tag image file format data processing method and device and electronic equipment.
Background
A geographic information system (Geographic Information System, abbreviated as GIS) is a particular very important spatial information system. The system is a technical system for collecting, storing, managing, operating, analyzing, displaying and describing the related geographic distribution data in the whole or partial earth surface (including atmosphere) space under the support of a computer hard and software system. The tag image file format (Tag Image File Format, abbreviated as TIFF) is one of the commonly used formats in graphic image processing, and its image format is complex, but because of its flexible and changeable storage of image information, it can support many color systems and is independent of the operating system, TIFF has been widely used. In various applications such as geographic information systems, photogrammetry, and remote sensing, images are required to have geocode information, such as a coordinate system in which the image is located, a scale, coordinates of points on the image, longitude and latitude, length units, and angle units. For storing and reading these information, it is difficult to do an image file in a pure TIFF format, and a geotag image file format (Geographic Tag Image File Format, abbreviated as GeoTIFF) is used as an extension of TIFF, and some geotags are defined on the basis of TIFF, so that various coordinate systems, ellipsoidal references, projection information and the like are defined and stored, and image data and geographic data are stored in the same image file, thus providing a convenient way for a wide range of users to make and use images with geographic information, and therefore, the GeoTIFF data is essentially a picture format. Meanwhile, as the remote sensing geographic data are more grid data and the picture format is the best grid data storage mode, the remote sensing geographic data are very suitable to be stored as GeoTIFF data.
Currently, in the GIS field, there are many processing methods for GeoTIFF data, for example: the Web Map Service (Web Map Service) is to make a Map by using data with geospatial location information, wherein the Map is defined as a visual representation of the geographic data, and can return to a corresponding Map according to a user's request, including a grid form such as PNG, GIF, JPEG, or a vector form such as SVG or Web CGM. The Tile Map Service (TMS) is also called a cache service area, and the Map cache is a very effective method for enabling Map and image services to run faster. When creating a map cache, the server may draw the entire map and store copies of the map image at several different scale levels. The server may then distribute the images when the user requests to use the map.
However, current data processing methods do not support flexible data demand scenarios well. For example, when a request for GeoTIFF data is changed in data range and data precision, the prior art is not good in processing the GeoTIFF data, and there is a problem that resources are too high or the request cannot be completed and the processing speed is slow. Specifically, the data range may be, for example, a latitude and longitude range, and the data accuracy may be, for example, the data accuracy under a certain latitude and longitude range.
Disclosure of Invention
In view of the foregoing, an object of the present application is to provide a method, an apparatus and an electronic device for processing geotag image file format data, so as to solve the problems that in the prior art, when a request for changing a data range and data precision of GeoTIFF data is faced, in a processing process of the GeoTIFF data, resource occupation is too high or the request cannot be completed and processing speed is slow.
In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:
in a first aspect, an embodiment of the present application provides a method for processing geotag image file format data, where the method includes:
receiving a data access request, wherein the data access request is used for requesting to access target geographic tag image file format data, and the data access request comprises an identification of attribute information of the target geographic tag image file format data;
inquiring attribute information of the target geographic tag image file format data according to the identification of the attribute information of the target geographic tag image file format data, wherein the attribute information comprises at least one of the following: the data projection information of the target geographic tag image file format data;
Reading returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the attribute information of the target geographic tag image file format data;
and sending the returned geotag image file format data.
As a possible implementation manner, the data access request further includes: the request mode corresponding to the target geographic tag image file format data comprises the following steps: a single point request mode or a range request mode;
the single-point request mode is used for indicating that the target geographic tag image file format data is geographic tag image file format data of a single position;
the range request mode is used for indicating that the target geographic tag image file format data is geographic tag image file format data of a target location area, and the target location area comprises a plurality of geographic locations;
the reading the target geotag image file format data according to the attribute information of the target geotag image file format data comprises the following steps:
and reading the target geographic tag image file format data according to the attribute information of the target geographic tag image file format data and the request mode corresponding to the target geographic tag image file format data.
As a possible implementation manner, the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the attribute information of the target geotag image file format data and the request manner corresponding to the target geotag image file format data includes:
if the request mode corresponding to the target geographic tag image file format data is a single-point request mode, determining whether to execute projection conversion according to the data projection information of the target geographic tag image file format data in the attribute information, and if so, reading the returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the data projection information of the target geographic tag image file format data and preset projection information.
As a possible implementation manner, the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the data projection information of the target geotag image file format data and the preset projection information includes:
Transforming the source data points and the point arrays of the target geotag image file format data from the data projection information of the target geotag image file format data to the preset projection information;
and determining returned geotag image file format data corresponding to the target geotag image file format data according to the precision of the transformed data.
As a possible implementation manner, the data access request further includes: data precision; the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the attribute information of the target geotag image file format data and the request mode corresponding to the target geotag image file format data includes:
and if the request mode corresponding to the target geographic tag image file format data is the range request mode, reading the returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the request range indicated by the range request mode, the data precision, the data projection information of the target geographic tag image file format data and the preset projection information.
As a possible implementation manner, the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the request range indicated by the range request manner, the data precision, the data projection information of the target geotag image file format data, and the preset projection information includes:
generating a bounding box under the projection of the source data according to the request range indicated by the range request mode and the data precision;
generating a point array according to the data precision of the target geographic tag image file format data;
projecting the generated point group according to the data projection information of the target geographic tag image file format data and the preset projection information;
and determining returned geotag image file format data corresponding to the target geotag image file format data according to the data precision of the source data and the data precision in the data access request.
As a possible implementation manner, before the querying the attribute information of the target geotag image file format data according to the identifier of the attribute information of the target geotag image file format data, the method further includes:
Acquiring a storage position of the target geographic tag image file format data;
reading the target geographic tag image file format data from the storage location;
analyzing the header file of the target geographic tag image file format data to obtain attribute information of the target geographic tag image file format data;
and storing attribute information of the target geographic tag image file format data.
In a second aspect, an embodiment of the present application further provides a geotag image file format data processing apparatus, where the apparatus includes:
the receiving module is used for receiving a data access request, wherein the data access request is used for requesting to access the target geographic tag image file format data, and the data access request comprises an identifier of attribute information of the target geographic tag image file format data;
the query module is used for querying the attribute information of the target geographic tag image file format data according to the identification of the attribute information of the target geographic tag image file format data, wherein the attribute information comprises at least one of the following items: the data projection information of the target geographic tag image file format data;
The reading module is used for reading returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the attribute information of the target geographic tag image file format data;
and the sending module is used for sending the returned geographic tag image file format data.
In a third aspect, an embodiment of the present application further provides an electronic device, including: the electronic device comprises a processor, a storage medium and a bus, wherein the storage medium stores program instructions executable by the electronic device, when the electronic device is running, the processor and the storage medium are communicated through the bus, and the processor executes the program instructions to execute the steps of the data processing method of the geographic tag image file format in the first aspect.
In a fourth aspect, embodiments of the present application further provide a computer readable storage medium, where a computer program is stored, where the computer program is executed by a processor to perform the steps of the geotag image file format data processing method according to the first aspect.
The beneficial effects of this application are:
the method, the device and the electronic equipment for processing the geographic tag image file format data are used for receiving a data access request, wherein the data access request is used for requesting to access target geographic tag image file format data, the data access request comprises identification of attribute information of the target geographic tag image file format data, the attribute information of the target geographic tag image file format data is queried according to the identification of the attribute information of the target geographic tag image file format data, return geographic tag image file format data corresponding to the target geographic tag image file format data is read according to the attribute information of the target geographic tag image file format data, and the return geographic tag image file format data is sent. In the above steps, the target GeoTIFF data is read through the attribute information of the target GeoTIFF data, but the target GeoTIFF data is not directly read, so that the resources of the processing equipment are saved, and the success rate and the efficiency of the GeoTIFF data processing request are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a GeoTIFF data processing method according to an embodiment of the present application;
fig. 2 is a flow chart of another GeoTIFF data processing method according to an embodiment of the present application;
fig. 3 is a flow chart of another GeoTIFF data processing method according to an embodiment of the present application;
fig. 4 is a flow chart of another GeoTIFF data processing method according to an embodiment of the present application;
fig. 5 is a flow chart of a GeoTIFF data processing method according to an embodiment of the present application;
fig. 6 is a flowchart of another GeoTIFF data processing method according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a GeoTIFF data processing apparatus according to an embodiment of the present application;
FIG. 8 is a schematic structural diagram of another GeoTIFF data processing device according to an embodiment of the present disclosure;
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this application, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to the flow diagrams and one or more operations may be removed from the flow diagrams as directed by those skilled in the art.
In addition, the described embodiments are only some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the presence of the features stated hereinafter, but not to exclude the addition of other features.
The following describes in detail a GeoTIFF data processing method provided in an embodiment of the present application with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of a GeoTIFF data processing method provided in an embodiment of the present application may be an electronic device capable of performing data processing, for example, a server, and as shown in fig. 1, the method includes:
in step S101, a data access request is received, where the data access request is used to request access to the target GeoTIFF data, and the data access request includes an identifier of attribute information of the target GeoTIFF data.
Specifically, when a user needs to access or acquire GeoTIFF data, a data access request is sent to a server through a terminal device. Optionally, the attribute information of the target GeoTIFF data may be marked by using the identifier of the attribute information, and the user sends the identifier of the attribute information of the target GeoTIFF data that needs to be accessed or acquired to the server through a data access request, so as to access the target GeoTIFF data. It will be appreciated that the identification of the attribute information of the target GeoTIFF data may be in the form of numerals, tags, or other forms, without specific limitation.
Optionally, when the server receives the data access request of the user, it needs to determine whether the currently idle resource of the system can execute the request operation, if the system resource is insufficient, the request is refused, and if the system resource is sufficient, the request operation is executed.
Step S102, inquiring the attribute information of the target GeoTIFF data according to the identification of the attribute information of the target GeoTIFF data.
Specifically, the attribute information at least includes data projection information of the target GeoTIFF data, and besides the data projection information, the attribute information may also include data granularity, data type, data bounding box, and the like.
The projection of GeoTIFF data refers to displaying geographic coordinates on a map or screen, and geographic coordinates are positions of the earth surface defined by using a three-dimensional sphere to realize referencing of points on the earth surface through longitude and latitude. The coordinate system composed of these numerous geographic coordinates is called geographic coordinate system (Geographic Coordinate System), and for example, the three common coordinate systems in china are: beijing 54, western Am 80, and WGS84, with WGS84 being the most popular geographic coordinate system at present. Internationally, each coordinate system is assigned an EPSG code, where the code of WGS84 is EPSG 4326. Since the geographic coordinates are three-dimensional, it is necessary to convert the three-dimensional geographic coordinates into two-dimensional coordinates for display on a map or screen. Common projections are equidistant rectangular projections (Platte Carre) and Mercator projections (Mercator).
Based on the above description of the projection of the data of GeoTIFF, the data projection information of the above target GeoTIFF data may refer to, for example, EPSG codes of a coordinate system, such as EPSG:4326, EPSG:3857, and the like.
The data granularity is the refinement and comprehensive degree of the data in the database, and the higher the refinement degree is, the smaller the granularity is according to the refinement standard of the data granularity; while the lower the degree of refinement, the larger the particle size.
The data type refers to what data type the target GeoTIFF data is stored in, and the default data type is int, which can also be configured as json, double, etc.
The data bounding box refers to a minimum bounding rectangle of a polygon in geographic information.
And the server inquires corresponding attribute information according to the identification of the attribute information of the target GeoTIFF data in the data access request sent by the user.
Optionally, before querying attribute information of the target GeoTIFF data, it may be determined whether an identifier of the target GeoTIFF data is configured in the data access request, where the identifier of the target GeoTIFF data may refer to flag information of the target GeoTIFF data in a file system, for example, may be a file name corresponding to the target GeoTIFF data, which is not limited herein specifically.
If the identifier of the target GeoTIFF data is configured in the data access request, the attribute information of the target GeoTIFF data corresponding to the identifier can be queried from the database, otherwise, the attribute information of the target GeoTIFF data which is closest to the data range in the request and has the highest precision is queried from the database.
After the attribute information of the target GeoTIFF data is obtained, the returned GeoTIFF data corresponding to the target data may be read according to the attribute information, and the specific process is described in step S103.
Step S103, according to the attribute information of the target GeoTIFF data, the returned GeoTIFF data corresponding to the target GeoTIFF data is read.
Specifically, the returned GeoTIFF data corresponding to the target GeoTIFF data may refer to GeoTIFF source data corresponding to the target GeoTIFF data, where the source data needs to be returned to the user.
After the attribute information of the target GeoTIFF data is queried, the GeoTIFF source data is queried according to the attribute information, and returned GeoTIFF data corresponding to the target GeoTIFF data is read.
Step S104, the returned GeoTIFF data is transmitted.
The returned GeoTIFF data obtained in step S103 is sent to the terminal device used by the user, and the user can then view the returned GeoTIFF data on the terminal device.
In summary, the embodiments of the present application provide a GeoTIFF data processing method, which receives a data access request, where the data access request is used for requesting access to target GeoTIFF data, the data access request includes an identifier of attribute information of the target GeoTIFF data, queries attribute information of the target GeoTIFF data according to the identifier of the attribute information of the target GeoTIFF data, reads returned GeoTIFF data corresponding to the target GeoTIFF data according to the attribute information of the target GeoTIFF data, and sends the returned GeoTIFF data. In the above steps, the target GeoTIFF data is read through the attribute information of the target GeoTIFF data, but the target GeoTIFF data is not directly read, so that the resources of the processing equipment are saved, and the success rate and the efficiency of the GeoTIFF data processing request are improved.
Optionally, in the data access request sent by the user, the server may further include a request mode corresponding to the target GeoTIFF data, where the request mode includes a single-point request mode or a range request mode, in addition to the identifier of the attribute information of the target GeoTIFF data.
Specifically, the single point request mode is used to indicate that the target GeoTIFF data is GeoTIFF data of a single location. For example, the user may request GeoTIFF data for a single location, location a. In the single point request method, a user may request not only a specific single location but also a plurality of single locations, for example, the user may request GeoTIFF data for a plurality of single locations such as "location B", "location C", "location D", etc.
The range request mode is used for indicating that the target GeoTIFF data is GeoTIFF data of a target location area, and the target location area comprises a plurality of geographic locations. For example, the user may request GeoTIFF data within the geographic area of "region a".
Optionally, reading the target GeoTIFF data according to the attribute information of the target GeoTIFF data may refer to reading the target GeoTIFF data not only according to the attribute information of the target GeoTIFF data, but also according to a request mode corresponding to the target GeoTIFF data.
By distinguishing the data request modes, single-point data requests and range data requests can be processed more specifically.
Since the data request mode is divided into a single point request or a range request, the following embodiments will describe in detail how data is processed in different request modes.
Optionally, if the request mode corresponding to the target GeoTIFF data is a single-point request mode, the returned GeoTIFF data corresponding to the target GeoTIFF data is read according to the attribute information of the target GeoTIFF data and the request mode corresponding to the target GeoTIFF data, which may mean that whether to execute projective transformation is determined according to the data projective information of the target GeoTIFF data in the attribute information, if yes, the returned GeoTIFF data corresponding to the target GeoTIFF data is read according to the data projective information of the target GeoTIFF data and preset projective information.
Specifically, reading the returned GeoTIFF data corresponding to the target GeoTIFF data according to the attribute information of the target GeoTIFF data and the request mode corresponding to the target GeoTIFF data may refer to that if the projection information of the target GeoTIFF data is different from the projection that is preset, the projection of the source data corresponding to the single point request is queried, and if not, the projection transformation needs to be performed. And then, reading the returned GeoTIFF data corresponding to the target GeoTIFF data.
The projective transformation refers to a process of transforming the coordinates of one map projection point into the coordinates of another map projection point. The projection may be, for example, EPSG 4326. The projection of the source data is different from the projection set in advance, projection conversion needs to be performed, which means that if the projection of the source data is not EPSG 4326, the projection of the source data needs to be converted into EPSG 4326, otherwise, conversion is not required.
Optionally, if projective transformation needs to be performed, a specific process of reading returned GeoTIFF data corresponding to the target GeoTIFF data according to the data projective information of the target GeoTIFF data and preset projective information may be divided into two steps, please refer to fig. 2, which is a schematic flow diagram of another GeoTIFF data processing method provided in the embodiment of the present application, as shown in fig. 2, where the process includes:
In step S201, the source data point and the point group of the target GeoTIFF data are converted from the data projection information of the target GeoTIFF data to the predetermined projection information.
Optionally, the server may further include request data corresponding to the target GeoTIFF data in the data access request sent by the user, where the request data may be geographic location information for different types and different formats.
Further, the attribute information of the target GeoTIFF data is queried from the database, the metadata of the request data point and the metadata of the point array corresponding to the target GeoTIFF data are queried according to the attribute information of the target GeoTIFF data, and then the metadata are transformed from the data projection information of the target GeoTIFF data to the preset projection information.
The request data point of the target GeoTIFF data refers to a source data point of the GeoTIFF data corresponding to a single location of a user request query in a single-point request, and the point array refers to an array formed by a plurality of data points of the GeoTIFF data corresponding to a plurality of single locations of the user request query in the single-point request. The pixel refers to a pixel point or a pixel point, that is, an image element (picture element), which is the smallest unit that forms a digitized image, and the image element is the smallest unit that the sensor scans and samples the ground scene during remote sensing data acquisition, such as scanning imaging. Then, the pixel data refers to the image unit data, i.e. the minimum unit data constituting the image data. The projection information set in advance may be EPSG 4326. For example, if the data projection of the target GeoTIFF data is EPSG:3857, then the requested data point and point array for the target GeoTIFF data is transformed from EPSG:3857 to EPSG:4326.
Step S202, determining returned GeoTIFF data corresponding to the target GeoTIFF data according to the precision of the projectively transformed data.
Specifically, if the precision of the data after projection transformation is insufficient for the source data corresponding to the target GeoTIFF data, interpolation is needed to be performed on the source data point and the point group by adopting an interpolation method, so that the target precision is achieved. If the coordinate after the transfer projection is positioned in the data grid point, the precision is enough, otherwise, the precision is insufficient. Because the remote sensing geographic data is more grid data, there are data grids in the GeoTIFF data, and the data grid points refer to the respective intersections in the grid. In the embodiment of the present application, the interpolation method may be, for example, a quadratic interpolation method, a nearest difference method, or the like, and is not particularly limited herein.
Optionally, the server may further include data precision in addition to the identifier of the attribute information of the target GeoTIFF data and the request mode corresponding to the target GeoTIFF data in the data access request sent by the user.
Specifically, the data accuracy refers to data accuracy of the GeoTIFF data within a certain data range, for example, if the data range is a latitude and longitude range, there is data accuracy within a certain latitude and longitude range, for example, data with 3m accuracy, data with 10 m accuracy, and the like.
If the data request method of the user is a range request, the user needs to transmit data accuracy in addition to the identification of the attribute information of the destination GeoTIFF data and the request method when transmitting the data access request.
Optionally, the server may further include a data type in addition to the identifier of the attribute information of the target GeoTIFF data, the request mode corresponding to the target GeoTIFF data, and the data precision in the data access request sent by the user.
Optionally, if the request mode corresponding to the target GeoTIFF data is a range request mode, reading the returned GeoTIFF data corresponding to the target GeoTIFF data according to the attribute information of the target GeoTIFF data and the request mode corresponding to the target GeoTIFF data, which may refer to reading the returned GeoTIFF data corresponding to the target GeoTIFF data according to the request range indicated by the range request mode, the data precision, the data projection information of the target GeoTIFF data and the preset projection information.
Optionally, the specific process of reading the returned GeoTIFF data corresponding to the target GeoTIFF data according to the request range indicated by the range request manner, the data precision, the data projection information of the target GeoTIFF data, and the preset projection information may be divided into four steps, please refer to fig. 3, which is a schematic flow diagram of another GeoTIFF data processing method provided in the embodiment of the present application, as shown in fig. 3, where the process includes:
In step S301, a bounding box under the projection of the source data is generated according to the request range indicated by the range request method and the data precision.
Specifically, the request scope may refer to a target geographic location area that is requested by the user, where the target geographic location area includes a plurality of geographic locations.
Since the bounding box is the smallest circumscribed rectangle of a polygon in geographic information, generating the bounding box under the projection of the source data according to the request range and the data precision can mean generating the smallest circumscribed rectangle of the target GeoTIFF data under the original projection according to the request range and the data precision.
In step S302, a point array is generated according to the data precision of the target GeoTIFF data.
Specifically, attribute information of target GeoTIFF data is queried from a database, and according to data precision of the target GeoTIFF data, pixel data are read in batches to generate a data point array. The point group is an array formed by a plurality of source data points of GeoTIFF data corresponding to a plurality of positions in a geographic position area corresponding to a request range of a user request query in a range request mode. Because the corresponding geographic coordinate information can be calculated according to the position and projection information of the pixel data in the image, the pixel value of each pixel point can correspond to one data point, and the data point can refer to an object with the geographic coordinate information and the corresponding pixel value, the data point array can be generated by reading the pixel data.
Step S303, projecting the generated point group according to the data projection information of the target GeoTIFF data and the preset projection information.
Specifically, whether the data projection information of the target GeoTIFF data is the same as the preset projection information is judged, if not, the point group is projected, namely, the point group is converted from the data projection information of the target GeoTIFF data to the preset projection information. The projection information set in advance may be EPSG 4326.
Step S304, determining the returned GeoTIFF data corresponding to the target GeoTIFF data according to the data precision of the source data and the data precision in the data access request.
Specifically, it is necessary to first determine whether the data precision of the source data is sufficient, and if the data precision of the source data is insufficient, then it is necessary to perform a difference operation on the source data point array according to the data precision in the data access request, so as to achieve the target precision. The interpolation method may be, for example, a quadratic difference method, a nearest interpolation method, or the like, and is not particularly limited herein.
Optionally, the server may also need to perform some preprocessing operation on the source data before processing the data according to the received data access request, and the preprocessing operation will be described in the following embodiments.
Referring to fig. 4, a flowchart of another GeoTIFF data processing method according to an embodiment of the present application is shown in fig. 4, and before the step S102, the method further includes:
in step S401, a storage location of the target GeoTIFF data is acquired.
The storage location of the target GeoTIFF data may refer to the location of the target GeoTIFF data in the file system, for example, a tif file is file:// C:// Document/test. Tif, and the storage location of the target GeoTIFF data obtained by the server is: "C:// Document/test. Tif". Likewise, the tif file may be in a distributed file system such as hfs or in a file server such as ftp. It should be noted that the target GeoTIFF data is placed in a file system available to the server.
Step S402, the target GeoTIFF data is read from the storage location.
Specifically, the server reads the target GeoTIFF data from the storage location of the acquired target GeoTIFF data.
Step S403, parse the header file of the target GeoTIFF data to obtain attribute information of the target GeoTIFF data.
Specifically, reading a header file of the target GeoTIFF data, and analyzing the header file according to the published standard of GeoTIFF to obtain attribute information such as projection information, data granularity, data type, data bounding box and the like of the target GeoTIFF data.
In step S404, attribute information of the target GeoTIFF data is stored.
Specifically, after the header file of the target GeoTIFF data is parsed to obtain projection information, the projection information needs to be judged, if the projection of the target GeoTIFF data is preset projection information, the parsed attribute information including the projection information, the data granularity, the data type, the data bounding box and other animal signs are saved in a database; if the projection of the target GeoTIFF data is not the preset projection information, the bounding box of the data is subjected to projection conversion to the preset projection information, and then the analyzed attribute information is stored in a database. The projection information set in advance may be EPSG 4326.
Optionally, in addition to saving the parsed attribute information to the database, the storage location of the target GeoTIFF data needs to be saved to the database.
Fig. 5 is a flow chart of a GeoTIFF data processing method provided by an embodiment of the present application, and as shown in fig. 5, a preprocessing process of GeoTIFF data of the GeoTIFF data processing method provided by the embodiment of the present application includes: starting a service, waiting for a data manager to upload a storage position of GeoTIFF data, reading a header file of the GeoTIFF data file when the storage position of GeoTIFF data is received, analyzing the header file according to the published standard of GeoTIFF, analyzing the projection information, data granularity, data type, data bounding box and other attributes of the GeoTIFF data, judging whether the projection is EPSG 4326, if so, storing the analyzed attributes in a database, if not, re-projecting the data bounding box into the EPSG 4326, and then storing the analyzed attributes in the database.
Fig. 6 is a flowchart of another GeoTIFF data processing method provided in the embodiment of the present application, and as shown in fig. 6, a query process for GeoTIFF data in the GeoTIFF data processing method provided in the embodiment of the present application includes: and receiving a data request of a user, judging whether the current idle resource of the system can execute the request, if not, rejecting the request, and if so, firstly judging whether the data request mode is a single-point request or a range request. For a single-point request, firstly inquiring a target source data point and a point group according to attributes, inquiring pixel data corresponding to the data point from the source data, carrying out projection transformation on the source data point and the point group to the preset projection if the projection of the source data is different from the preset projection, interpolating the source data point and the point group by adopting an interpolation method to reach the target precision if the data precision of the source data after projection transformation is insufficient, and returning the data; for a range request, firstly generating bounding boxes under projection of source data according to a request range and precision, reading pixel data in batches according to the data precision of the source data, generating a data point array, performing projection transformation on the source data point array to the preset projection if the projection of the source data is different from the preset projection, and performing difference operation on the source data point array according to the data precision in a data access request if the data precision of the source data is insufficient so as to achieve the target precision and returning the data.
It should be noted that the specific implementation details in fig. 5 and fig. 6 are already described in the foregoing embodiments, and are not repeated here.
Based on the same inventive concept, the embodiment of the present application further provides a GeoTIFF data processing device corresponding to the GeoTIFF data processing method, and since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the GeoTIFF data processing method described in the embodiment of the present application, the implementation of the device may refer to the implementation of the method, and the repetition is omitted.
Fig. 7 is a schematic structural diagram of a GeoTIFF data processing apparatus according to an embodiment of the present application, as shown in fig. 7, where the apparatus includes:
the receiving module 701 is configured to receive a data access request, where the data access request is used to request access to the target geotag image file format data, and the data access request includes an identifier of attribute information of the target geotag image file format data.
The query module 702 is configured to query attribute information of the target geotag image file format data according to an identifier of the attribute information of the target geotag image file format data, where the attribute information includes at least one of: data projection information of the target geotag image file format data.
The first reading module 703 is configured to read returned geotag image file format data corresponding to the target geotag image file format data according to attribute information of the target geotag image file format data.
And a sending module 704, configured to send the returned geotag image file format data.
In one possible implementation, the first reading module 730 is specifically configured to:
and reading the target geographic tag image file format data according to the attribute information of the target geographic tag image file format data and the request mode corresponding to the target geographic tag image file format data.
In one possible implementation, the first reading module 730 is specifically further configured to:
if the request mode corresponding to the target geographic tag image file format data is a single-point request mode, determining whether to execute projection conversion according to the data projection information of the target geographic tag image file format data in the attribute information, and if so, reading the returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the data projection information of the target geographic tag image file format data and preset projection information.
In one possible implementation, the first reading module 730 is specifically further configured to:
transforming the source data points and the point arrays of the target geotag image file format data from the data projection information of the target geotag image file format data to preset projection information; and determining returned geotag image file format data corresponding to the target geotag image file format data according to the accuracy of the converted data.
In one possible implementation, the first reading module 730 is specifically further configured to:
if the request mode corresponding to the target geographic tag image file format data is a range request mode, reading the returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the request range indicated by the range request mode, the data precision, the data projection information of the target geographic tag image file format data and the preset projection information.
In one possible implementation, the first reading module 730 is specifically further configured to:
generating a bounding box under the projection of the source data according to the request range indicated by the range request mode and the data precision; generating a point array according to the data precision of the target geographic tag image file format data; projecting the generated point group according to the data projection information of the target geographic tag image file format data and preset projection information; and determining returned geotag image file format data corresponding to the target geotag image file format data according to the data precision of the source data and the data precision in the data access request.
Fig. 8 is a schematic structural diagram of another GeoTIFF data processing apparatus according to an embodiment of the present application, as shown in fig. 8, where the apparatus further includes:
an obtaining module 801, configured to obtain a storage location of the target geotag image file format data.
A second reading module 802, configured to read the target geotag image file format data from the storage location.
And the parsing module 803 is configured to parse the header file of the target geotag image file format data to obtain attribute information of the target geotag image file format data.
A saving module 804, configured to save attribute information of the target geotag image file format data.
The foregoing apparatus is configured to execute the method provided in the foregoing embodiment, and description of the processing flow of each module in the apparatus and the interaction flow between each module may refer to the relevant description in the foregoing method embodiment, which is not repeated herein.
The above modules may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), or one or more digital processors (digital singnal processor, abbreviated as DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGA), etc. For another example, when a module above is implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processor that may invoke the program code. For another example, the modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
The embodiment of the application further provides an electronic device 900, as shown in fig. 9, which is a schematic structural diagram of the electronic device 900 provided in the embodiment of the application, including: a processor 901, a memory 902, and a bus 903. The memory 902 stores machine readable instructions executable by the processor 901, which when executed by the processor 901 perform the method steps in the above described GeoTIFF data processing method embodiments when the electronic device 900 is in operation, the processor 901 communicates with the memory 902 via the bus 903.
The present application also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor performs the steps in the above-described embodiments of a GeoTIFF data processing method.
In particular, the storage medium can be a general-purpose storage medium, such as a removable disk, a hard disk, or the like, and the computer program on the storage medium can execute the above-described embodiment of the GeoTIFF data processing method when executed.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

Claims (10)

1. A method for processing geo-tagged image file format data, the method comprising:
receiving a data access request, wherein the data access request is used for requesting to access target geographic tag image file format data, and the data access request comprises an identification of attribute information of the target geographic tag image file format data;
inquiring attribute information of the target geographic tag image file format data according to the identification of the attribute information of the target geographic tag image file format data, wherein the attribute information comprises at least one of the following: the data projection information of the target geographic tag image file format data;
reading returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the attribute information of the target geographic tag image file format data;
and sending the returned geotag image file format data.
2. The method of claim 1, wherein the data access request further comprises: the request mode corresponding to the target geographic tag image file format data comprises the following steps: a single point request mode or a range request mode;
The single-point request mode is used for indicating that the target geographic tag image file format data is geographic tag image file format data of a single position;
the range request mode is used for indicating that the target geographic tag image file format data is geographic tag image file format data of a target location area, and the target location area comprises a plurality of geographic locations;
the reading the target geotag image file format data according to the attribute information of the target geotag image file format data comprises the following steps:
and reading the target geographic tag image file format data according to the attribute information of the target geographic tag image file format data and the request mode corresponding to the target geographic tag image file format data.
3. The method according to claim 2, wherein the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the attribute information of the target geotag image file format data and the request mode corresponding to the target geotag image file format data includes:
if the request mode corresponding to the target geographic tag image file format data is a single-point request mode, determining whether to execute projection conversion according to the data projection information of the target geographic tag image file format data in the attribute information, and if so, reading the returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the data projection information of the target geographic tag image file format data and preset projection information.
4. The method according to claim 3, wherein the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the data projection information of the target geotag image file format data and the preset projection information includes:
transforming the source data points and the point arrays of the target geotag image file format data from the data projection information of the target geotag image file format data to the preset projection information;
and determining returned geotag image file format data corresponding to the target geotag image file format data according to the precision of the transformed data.
5. The method of claim 2, wherein the data access request further comprises: data precision; the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the attribute information of the target geotag image file format data and the request mode corresponding to the target geotag image file format data includes:
and if the request mode corresponding to the target geographic tag image file format data is the range request mode, reading the returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the request range indicated by the range request mode, the data precision, the data projection information of the target geographic tag image file format data and preset projection information.
6. The method according to claim 5, wherein the reading the returned geotag image file format data corresponding to the target geotag image file format data according to the request range indicated by the range request manner, the data precision, the data projection information of the target geotag image file format data, and the preset projection information includes:
generating a bounding box under the projection of the source data according to the request range indicated by the range request mode and the data precision;
generating a point array according to the data precision of the target geographic tag image file format data;
projecting the generated point group according to the data projection information of the target geographic tag image file format data and the preset projection information;
and determining returned geotag image file format data corresponding to the target geotag image file format data according to the data precision of the source data and the data precision in the data access request.
7. The method according to any one of claims 1-6, wherein before querying the attribute information of the target geotag image file format data according to the identification of the attribute information of the target geotag image file format data, the method further comprises:
Acquiring a storage position of the target geographic tag image file format data;
reading the target geographic tag image file format data from the storage location;
analyzing the header file of the target geographic tag image file format data to obtain attribute information of the target geographic tag image file format data;
and storing attribute information of the target geographic tag image file format data.
8. A geotag image file format data processing apparatus, the apparatus comprising:
the receiving module is used for receiving a data access request, wherein the data access request is used for requesting to access the target geographic tag image file format data, and the data access request comprises an identifier of attribute information of the target geographic tag image file format data;
the query module is used for querying the attribute information of the target geographic tag image file format data according to the identification of the attribute information of the target geographic tag image file format data, wherein the attribute information comprises at least one of the following items: the data projection information of the target geographic tag image file format data;
the reading module is used for reading returned geographic tag image file format data corresponding to the target geographic tag image file format data according to the attribute information of the target geographic tag image file format data;
And the sending module is used for sending the returned geographic tag image file format data.
9. An electronic device, comprising: a processor, a storage medium and a bus, the storage medium storing program instructions executable by the processor, the processor and the storage medium communicating via the bus when the electronic device is running, the processor executing the program instructions to perform the steps of the geotag image file format data processing method of any one of claims 1 to 7 when executed.
10. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the geotag image file format data processing method according to any of claims 1 to 7.
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