CN110717087A - Method and system for acquiring normalized vegetation index NDVI of designated position point - Google Patents
Method and system for acquiring normalized vegetation index NDVI of designated position point Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a system for acquiring a normalized vegetation index NDVI of a specified position point. The method comprises the following steps: the method comprises the steps that a client side obtains coordinate information of a specified position point, generates an NDVI calculation request of the specified position point based on the coordinate information and sends the NDVI calculation request to a server side, wherein the NDVI calculation request comprises the coordinate information; and after receiving the NDVI calculation request, the server inquires NDVI time sequence data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information, and returns the NDVI time sequence data to the client. According to the method and the system for acquiring the normalized vegetation index NDVI of the designated position point, the corresponding NDVI time sequence data is inquired in the pre-stored NDVI raster data according to the coordinate information of the designated position point, so that the acquisition efficiency of the normalized vegetation index NDVI of the designated position point is improved, and the calculation resources are greatly saved.
Description
Technical Field
The embodiment of the invention relates to the technical field of data processing and communication, in particular to a method and a system for acquiring a normalized vegetation index (NDVI) of a designated position point.
Background
The normalized Vegetation Index (NDVI) is the most commonly used Index for characterizing the Vegetation status at present, and studies show that the normalized Vegetation Index is very sensitive to the production situation and the growth amount of Vegetation, can well reflect the luxuriant degree of surface Vegetation, and is a good Index for indicating the activity of Vegetation and the productivity of Vegetation. The normalized vegetation index is typically generated from raw satellite image data and is defined as the ratio of the difference between the near infrared and red band reflectance values to the sum of the 2 band reflectance values. Its value is limited to-1, where vegetation areas are large and non-vegetation areas, deserts, bodies of water, etc., have low or negative NDVI values, and vegetation is generally considered to be rare when the value is less than 0.1. The normalized vegetation index is widely applied to vegetation growth condition description, land cover type classification, vegetation productivity estimation, drought monitoring analysis, urban land grading, desertification monitoring, urban ecological environment quality assessment and the like.
Because the NDVI index is based on the spatial data of the remote sensing image, and can be continuously changed on a time axis, the NDVI index has a space-time attribute, and the NDVI data volume of a long-time sequence of the NDVI index is huge for a country or a region. The traditional NDVI data storage and analysis mode is mainly that long-time sequence remote sensing images corresponding to a certain area are downloaded, NDVI data are generated by using related software tools (such as ArcGIS, erdas), data of a required area are cut out, then the data of the area are analyzed, and the overall vegetation situation and the plant quantity of the area are obtained according to the NDVI data.
When a user only needs the vegetation index of a long-time sequence of a certain point, the remote sensing image data of a single point cannot be processed, so that the NDVI data of a region containing the point also needs to be generated, then the point in the region is found, and the NDVI values of the point on different time sequence raster layers are obtained. When the NDVI values of the target point on different time sequence raster image layers are obtained from the regional NDVI data, manual searching is required to be performed gradually according to the distance of the position, the process is time-consuming and labor-consuming, and the application of the NDVI data on the coordinate point layer is seriously hindered. Moreover, because obtaining the NDVI data of the designated location point requires obtaining the NDVI data of the area, a large amount of computing resources are wasted.
Disclosure of Invention
In order to solve the problems of time and labor waste and resource waste in the prior art when the NDVI data of the designated position point is acquired, the embodiment of the invention provides a method and a system for acquiring the normalized vegetation index NDVI of the designated position point.
In a first aspect, an embodiment of the present invention provides a method for obtaining a normalized vegetation index NDVI at a specified location point, including: the method comprises the steps that a client side obtains coordinate information of a specified position point, generates an NDVI calculation request of the specified position point based on the coordinate information and sends the NDVI calculation request to a server side, wherein the NDVI calculation request comprises the coordinate information; after receiving the NDVI calculation request, the server inquires NDVI time sequence data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information, and returns the NDVI time sequence data to the client; the NDVI raster data is stored with raster pixel coordinates and corresponding NDVI time series data.
In a second aspect, an embodiment of the present invention provides a normalized vegetation index NDVI acquiring system for a specified location point, including a server and a client, where: the client is used for acquiring coordinate information of a specified position point, generating an NDVI calculation request of the specified position point based on the coordinate information and sending the NDVI calculation request to the server, wherein the NDVI calculation request comprises the coordinate information; the server is used for querying NDVI time sequence data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information after receiving the NDVI calculation request, and returning the NDVI time sequence data to the client; the NDVI raster data is stored with raster pixel coordinates and corresponding NDVI time series data.
According to the method and the system for acquiring the normalized vegetation index NDVI of the designated position point, the corresponding NDVI time sequence data is inquired in the pre-stored NDVI raster data according to the coordinate information of the designated position point, so that the acquisition efficiency of the normalized vegetation index NDVI of the designated position point is improved, and the calculation resources are greatly saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a method for obtaining a normalized vegetation index NDVI at a specific location according to an embodiment of the present invention;
fig. 2 is an architecture diagram of a normalized vegetation index NDVI acquisition method for a specified location point according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a normalized vegetation index NDVI acquisition system for a specified location point according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a method for obtaining a normalized vegetation index NDVI at a specific location according to an embodiment of the present invention. As shown in fig. 1, the method includes:
step 101, a client acquires coordinate information of a specified position point, generates an NDVI calculation request of the specified position point based on the coordinate information and sends the NDVI calculation request to a server, wherein the NDVI calculation request comprises the coordinate information;
the client firstly acquires coordinate information of a specified position point, and generates an NDVI calculation request of the specified position point based on the coordinate information, wherein the NDVI calculation request comprises the coordinate information; and the client sends the NDVI calculation request of the specified position point to the server side at the same time of generating the NDVI calculation request of the specified position point or after generating the NDVI calculation request of the specified position point.
Step 102, after receiving the NDVI calculation request, the server queries NDVI time series data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information, and returns the NDVI time series data to the client; the NDVI raster data is stored with raster pixel coordinates and corresponding NDVI time series data.
After receiving the NDVI calculation request sent by the client, the server queries NDVI time series data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information in the NDVI calculation request. The NDVI time-series data corresponding to the coordinate information is NDVI time-series data of the specified location point.
The NDVI raster data pre-stored in the server may be NDVI raster data obtained based on regional remote sensing image data, and the NDVI raster data includes grid pixel coordinates (coordinates corresponding to pixels) and information of corresponding NDVI time series data. NDVI time series data refers to a collection of NDVI values over a time series.
When the server side queries NDVI time series data corresponding to the coordinate information in the NDVI raster data stored in advance according to the coordinate information sent by the client side, if the coordinate information which is completely consistent with the coordinate information is not queried, the server side takes the NDVI time series data corresponding to the coordinate closest to the coordinate information as the NDVI time series data corresponding to the coordinate information, namely the NDVI time series data of the specified location point.
And after the server acquires the NDVI time sequence data corresponding to the coordinate information, returning the NDVI time sequence data to the client.
According to the embodiment of the invention, the corresponding NDVI time sequence data is inquired in the pre-stored NDVI raster data according to the coordinate information of the specified position point, so that the acquisition efficiency of the normalized vegetation index NDVI of the specified position point is improved, and the calculation resource is greatly saved.
Further, based on the above embodiment, the client obtains coordinate information of a specified location point, generates an NDVI calculation request of the specified location point based on the coordinate information, and sends the NDVI calculation request to the server, and specifically includes: the client acquires the coordinate information of the specified position point by receiving a click command of a user on a map or receiving a coordinate value input by the user at a preset position, generates an NDVI calculation request of the specified position point based on the coordinate information after a preset NDVI value acquisition button is triggered, and sends the NDVI calculation request to the server.
The client can acquire the coordinate information according to the click position of the user by receiving a click command of the user on a map displayed on a client interface; the client can also acquire the coordinate information in a mode of receiving the coordinate value input by the user at the preset position. After the coordinate information is acquired, if it is judged that a preset NDVI value acquisition button is triggered, for example, information that the preset NDVI value acquisition button is clicked is acquired, generating and sending an NDVI calculation request of the specified location point to the server, where the NDVI calculation request includes the coordinate information.
On the basis of the embodiment, the client side obtains the coordinate information of the specified position point by receiving a click command of a user on a map or receiving a coordinate value input by the user at a preset position, and then generates and sends an NDVI calculation request of the specified position point to the server side after a preset NDVI value obtaining button is triggered, so that the convenience and the rapidness of obtaining and sending the coordinate information of the specified position point are improved.
Further, based on the above embodiment, the processing procedure that the client acquires coordinate information of a specified location point, generates an NDVI calculation request of the specified location point based on the coordinate information, and sends the NDVI calculation request to the server is realized through a visualization interface constructed based on an HTML5 technology and an open source map engine; and constructing the visual interface by utilizing an HTML5 technology, and importing a map in the visual interface through the open source map engine.
And constructing the visual interface by utilizing an HTML5 technology, and importing a map in the visual interface through the open source map engine. The map can be displayed on a client-side visual interface constructed by an open source map engine (such as Openlayer) based on HTML5 technology. The user can accurately find the longitude and latitude coordinates of the required position through the map. The client can acquire the coordinate information by receiving a click command of a user on a map of the visual interface, or acquire the coordinate information by receiving a coordinate value input by the user at a preset position of the visual interface of the client.
After the coordinate information is acquired, if the client judges that a preset NDVI value acquisition button is triggered, generating and sending an NDVI calculation request of the specified position point to the server. The NDVI value obtaining button may be disposed on the client visual interface.
On the basis of the embodiment, the embodiment of the invention realizes online acquisition of coordinate information and online sending of the NDVI calculation request of the designated position point through the visual interface constructed based on the HTML5 technology and the open source map engine, and improves the convenience.
Further, based on the above embodiment, the method further includes: the remote sensing image data of the server-based region is obtained and stored through an NDVI algorithm, wherein the NDVI raster data of the remote sensing image data comprises NDVI time sequence data of each pixel in the remote sensing image data; and the NDVI time sequence data of each image element corresponds to the coordinates of the position point corresponding to the image element.
The remote sensing image data of the server-based region is obtained through an NDVI algorithm and pre-stored.
A pixel, also called a pixel or a pixel point, i.e., an image element (picture element), is a minimum unit constituting a digitized image. When remote sensing data acquisition, such as scanning imaging, the system is the minimum unit for scanning and sampling a ground scene by a sensor; in digital image processing, the sampling points are sampling points when analog images are scanned and digitized, are basic units for forming remote sensing digital images, and are sampling points in the remote sensing imaging process.
When the NDVI algorithm is implemented on the remote sensing image data of the region, calculation can be performed by taking the pixel as a unit to obtain NDVI raster data by taking the pixel as a unit. And if the remote sensing image data of the region is long-time sequence remote sensing image data, the obtained NDVI raster data is also long-time sequence raster data.
Because the pixels of the remote sensing image data correspond to the coordinates, the NDVI time series data of each pixel correspond to the coordinates of the position point corresponding to the pixel. That is, the NDVI raster data stores NDVI time-series data in one-to-one correspondence with coordinates.
On the basis of the embodiments, the NDVI raster data is obtained by performing NDVI calculation on remote sensing image data of the area and stored, and a premise is provided for rapidly acquiring NDVI time series data based on a specified location point.
Further, based on the above embodiment, the server is implemented based on a WebGIS server application.
The server may be a web server installed with a WebGIS server application. The original remote sensing image data is stored in a web server and is released through a WebGIS server application program (such as GeoServer). And the NDVI algorithm is realized by utilizing a WebGIS server application program, a corresponding interface is released, and the NDVI value of the input coordinate point is calculated based on the remote sensing image data.
On the basis of the embodiment, the embodiment of the invention realizes the construction of the server based on the WebGIS server application program, and provides a premise for online acquisition of the NDVI time series data of the specified location point.
Further, according to the above embodiment, after the returning the NDVI time series data to the client, the method further includes: and the client displays the NDVI time sequence data in a preset graph and/or table mode.
In the NDVI data service in the prior art, after acquiring NDVI data on a time series of a specified location point, a user needs to input the NDVI data of the time series of the location point by using an additional software analysis tool (such as SPSS, Origin) to analyze the set of time series data, and the whole process is time-consuming, troublesome to operate, and prone to errors.
According to the embodiment of the invention, the server side obtains the NDVI time sequence data corresponding to the coordinate information and returns the NDVI time sequence data to the client side. And the client receives the NDVI time sequence data and can directly display the NDVI time sequence data corresponding to the coordinate information.
And the client displays the NDVI time sequence data in a preset graph and/or table mode. For example, the client may display the NDVI time series data for a certain period of time (e.g., 1 month to 12 months 2012) in a graphic manner (e.g., a bar chart or a bar chart), may display the NDVI time series data in a table manner, or may display the NDVI time series data in a manner of combining a graphic and a table.
The NDVI time series data may be NDVI values of respective months at a certain coordinate point.
It will be appreciated that the client may also present the NDVI time series data in other set manners.
The client may also provide for downloading of a presentation picture of the NDVI time series data.
On the basis of the embodiment, the NDVI time sequence data is received and displayed by the client side, so that other tools or software are prevented from being opened again to display the NDVI time sequence data, data can be visualized in time, and convenience is improved while functions are enriched.
Further, based on the above embodiment, the displaying, by the client, the NDVI time series data in a preset graph and/or table manner specifically includes: and displaying the NDVI time sequence data in a preset graph and/or table mode on a web interface of the client based on a big data display tool Echart embedded in the client.
The NDVI time series data are displayed by the client side in a preset graph and/or table mode, and the NDVI time series data can be displayed in a preset graph and/or table mode on a web interface of the client side through an embedded big data display tool.
A big data presentation tool (such as Echart) may be embedded in the client. And after the client receives the NDVI time sequence data, calling the big data display tool, and displaying the NDVI time sequence data in a preset graph and/or table mode on a web interface of the client.
On the basis of the embodiment, the NDVI time sequence data is displayed on the web interface of the client side through the embedded big data display tool, and convenience of data display is improved.
Fig. 2 is an architecture diagram of a normalized vegetation index NDVI acquisition method for a specific location point according to another embodiment of the present invention. As shown in fig. 2, the server is implemented by a web server installed with a WebGIS server application. The client is integrated with a user position coordinate point visual selection tool based on an open source map engine and an NDVI time series data display tool based on a big data display tool. The embodiment of the invention can realize the acquisition of the normalized vegetation index NDVI of the designated position point based on the web, and comprises the following key steps:
the server-side long-time sequence remote sensing image storage and release application comprises the following steps: and storing original remote sensing image data at a server side, and issuing the data through a WebGIS server application program (such as GeoServer).
NDVI algorithm program: based on a WebGIS server application program, realizing an NDVI algorithm, issuing a corresponding interface, and realizing the calculation of an NDVI value of an input coordinate point by using a remote sensing image; the NDVI algorithm, i.e., the calculation formula of the normalized vegetation index NDVI, is:
NDVI＝(NIR-R)/(NIR+R)
wherein, NIR represents the reflection value of a near infrared wave band in the remote sensing image; and R represents the reflection value of the red light wave band in the remote sensing image.
Client location coordinate acquisition: based on an HTML5 technology and an open source map engine (Openlayer), a client-side visible longitude and latitude position coordinate online selection application is constructed, a user can accurately find the longitude and latitude coordinates of a required position through a map, an online NDVI value acquisition button is clicked, and an NDVI calculation request of the position point is sent.
The client-side time sequence NDVI value is displayed on line: based on a big data presentation tool (such as Echart), after the NDVI time sequence data of a specified point is acquired, the data are visualized in time, and a picture which can be downloaded is provided.
According to the embodiment of the invention, the related remote sensing images are stored and issued in the WebGIS server, the NDVI raster data are generated by using an NDVI algorithm, the coordinate points input by a user are obtained through a client browser, the NDVI numerical values of different time sequences corresponding to the coordinate points are inquired at the server side according to the coordinate points, the numerical values are returned to the client side through the Internet, and the dynamic real-time drawing is realized by using a big data display tool of the client side, so that the requirement of tens of millions of users for rapidly processing and analyzing massive remote sensing images is met.
The embodiment of the invention provides a method for transmitting, displaying and analyzing massive NDVI point data of a long-time sequence by fusing an HTML5 technology, an open source map engine (Openlayer), an open source WebGIS application (Geoserver) and a big data graphic display and analysis tool (such as Echart). The open source map engine is fully utilized, so that a user can accurately find the coordinates of a position point needing NDVI data, a request for acquiring the NDVI value of the coordinate point time sequence is sent to the server, the server is based on remote sensing image data, only the NDVI value of the coordinate point is inquired, and the data generation time is greatly shortened. The generated data can be quickly returned to the client side due to small amount, and the client side utilizes a large data graph display and analysis tool to dynamically display the selected coordinate point NDVI time sequence data, so that the vegetation growth situation at the position can be analyzed from the variation trend graph. Therefore, the NDVI value of the designated position point is ensured to be rapidly obtained and accurately analyzed, and the application of the NDVI in geography is promoted.
Fig. 3 is a schematic structural diagram of a normalized vegetation index NDVI acquisition system for a specified location point according to an embodiment of the present invention. As shown in fig. 3, the system includes a server 1 and a client 2, wherein:
the client 2 is configured to acquire coordinate information of a specified location point, generate an NDVI calculation request of the specified location point based on the coordinate information, and send the NDVI calculation request to the server 1, where the NDVI calculation request includes the coordinate information;
the client 2 firstly acquires coordinate information of a specified position point, and generates an NDVI calculation request of the specified position point based on the coordinate information, wherein the NDVI calculation request comprises the coordinate information; and at the same time of generating the NDVI calculation request of the specified position point or after generating the NDVI calculation request of the specified position point, the client 2 sends the NDVI calculation request of the specified position point to the server 1.
The server 1 is configured to, after receiving the NDVI calculation request, query NDVI time series data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information, and return the NDVI time series data to the client 2; the NDVI raster data is stored with raster pixel coordinates and corresponding NDVI time series data.
After receiving the NDVI calculation request sent by the client 2, the server 1 queries NDVI time series data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information in the NDVI calculation request. The NDVI time-series data corresponding to the coordinate information is NDVI time-series data of the specified location point.
The NDVI raster data pre-stored in the server 1 may be NDVI raster data obtained based on regional remote sensing image data, and the NDVI raster data includes raster pixel coordinates and information of corresponding NDVI time series data.
And after the server 1 acquires the NDVI time series data corresponding to the coordinate information, returning the NDVI time series data to the client 2.
According to the embodiment of the invention, according to the requirement of obtaining the NDVI data application scene of the designated point, the traditional method of obtaining the NDVI data of all the regions containing the designated point based on a large-area remote sensing image, which wastes storage and calculation resources, is abandoned, a user is directly allowed to select or input the coordinate point at the client, only the time series NDVI value of the designated point is calculated at the server, and the calculation result is displayed at the client in real time. The storage space of the computer is greatly saved, the computing resources are greatly saved, and the efficiency of the user for acquiring data in the scene is greatly improved.
According to the embodiment of the invention, the corresponding NDVI time sequence data is inquired in the pre-stored NDVI raster data according to the coordinate information of the specified position point, so that the acquisition efficiency of the normalized vegetation index NDVI of the specified position point is improved, and the calculation resource is greatly saved.
Further, based on the above embodiment, when the client 2 is configured to obtain coordinate information of a specified location point, generate an NDVI calculation request of the specified location point based on the coordinate information, and send the NDVI calculation request to the server 1, the client is specifically configured to: the method comprises the steps of obtaining coordinate information of a specified position point by receiving a click command of a user on a map or receiving a coordinate value input by the user at a preset position, generating an NDVI calculation request of the specified position point based on the coordinate information after a preset NDVI value obtaining button is triggered, and sending the NDVI calculation request to the server 1.
The client 2 can acquire the coordinate information according to the click position of the user by receiving a click command of the user on a map displayed on a client interface; the client 2 may further obtain the coordinate information by receiving a coordinate value input by the user at the preset position. After the client 2 acquires the coordinate information, if it is determined that a preset NDVI value acquisition button is triggered, for example, information that the preset NDVI value acquisition button is clicked is acquired, an NDVI calculation request of the specified location point is generated and sent to the server 1, where the NDVI calculation request includes the coordinate information.
On the basis of the embodiment, the client side obtains the coordinate information of the specified position point by receiving a click command of a user on a map or receiving a coordinate value input by the user at a preset position, and then generates and sends an NDVI calculation request of the specified position point to the server side after a preset NDVI value obtaining button is triggered, so that the convenience and the rapidness of obtaining and sending the coordinate information of the specified position point are improved.
Further, based on the above embodiment, the client 2 is further configured to: and after the NDVI time sequence data returned by the server side are received, displaying the NDVI time sequence data in a preset graph and/or table mode.
The server 1 acquires the NDVI time series data corresponding to the coordinate information, and returns the NDVI time series data to the client 2. The client 2 receives the NDVI time series data, and may directly display the NDVI time series data corresponding to the coordinate information.
The client 2 displays the NDVI time series data in a preset graphic and/or table manner. For example, the client 2 may graphically display NDVI time series data for a certain period of time, may graphically display the NDVI time series data in a table form, or may graphically display the NDVI time series data in a table combination.
On the basis of the embodiment, the NDVI time sequence data is received and displayed by the client side, so that other tools or software are prevented from being opened again to display the NDVI time sequence data, data can be visualized in time, and convenience is improved while functions are enriched.
The system provided by the embodiment of the invention is used for the method, and specific functions can refer to the method flow, which is not described herein again.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for acquiring a normalized vegetation index (NDVI) of a specified position point is characterized by comprising the following steps:
the method comprises the steps that a client side obtains coordinate information of a specified position point, generates an NDVI calculation request of the specified position point based on the coordinate information and sends the NDVI calculation request to a server side, wherein the NDVI calculation request comprises the coordinate information;
after receiving the NDVI calculation request, the server inquires NDVI time sequence data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information, and returns the NDVI time sequence data to the client;
the NDVI raster data is stored with raster pixel coordinates and corresponding NDVI time series data.
2. The method according to claim 1, wherein the client acquires coordinate information of a specified location point, generates an NDVI calculation request of the specified location point based on the coordinate information, and sends the NDVI calculation request to the server, and specifically includes:
the client acquires the coordinate information of the specified position point by receiving a click command of a user on a map or receiving a coordinate value input by the user at a preset position, generates an NDVI calculation request of the specified position point based on the coordinate information after a preset NDVI value acquisition button is triggered, and sends the NDVI calculation request to the server.
3. The method according to claim 2, wherein the client obtains coordinate information of a specified location point, generates an NDVI calculation request of the specified location point based on the coordinate information, and sends the NDVI calculation request to the server, and the processing is realized by a visualization interface constructed based on an HTML5 technology and an open source map engine;
and constructing the visual interface by utilizing an HTML5 technology, and importing a map in the visual interface through the open source map engine.
4. The method of claim 1, further comprising:
the remote sensing image data of the server-based region is obtained and stored through an NDVI algorithm, wherein the NDVI raster data of the remote sensing image data comprises NDVI time sequence data of each pixel in the remote sensing image data; and the NDVI time sequence data of each image element corresponds to the coordinates of the position point corresponding to the image element.
5. The method of claim 4, wherein the server is implemented based on a WebGIS server application.
6. The method of claim 1, wherein after said returning the NDVI time series data to the client, the method further comprises:
and the client displays the NDVI time sequence data in a preset graph and/or table mode.
7. The method according to claim 6, wherein the client displays the NDVI time-series data in a preset graphical and/or tabular manner, specifically comprising:
and displaying the NDVI time sequence data in a preset graph and/or table mode on a web interface of the client based on a big data display tool Echart embedded in the client.
8. The utility model provides a normalized vegetation index NDVI who appoints position point obtains system which characterized in that, includes server and customer end, wherein:
the client is used for acquiring coordinate information of a specified position point, generating an NDVI calculation request of the specified position point based on the coordinate information and sending the NDVI calculation request to the server, wherein the NDVI calculation request comprises the coordinate information;
the server is used for querying NDVI time sequence data corresponding to the coordinate information in pre-stored NDVI raster data according to the coordinate information after receiving the NDVI calculation request, and returning the NDVI time sequence data to the client;
the NDVI raster data is stored with raster pixel coordinates and corresponding NDVI time series data.
9. The system according to claim 8, wherein the client, when configured to obtain coordinate information of a specified location point, generate the NDVI calculation request of the specified location point based on the coordinate information, and send the NDVI calculation request to the server, is specifically configured to:
and acquiring the coordinate information of the specified position point by receiving a click command of a user on a map or receiving a coordinate value input by the user at a preset position, and generating an NDVI calculation request of the specified position point based on the coordinate information and sending the NDVI calculation request to the server after a preset NDVI value acquisition button is triggered.
10. The system of claim 8, wherein the client is further configured to:
and after the NDVI time sequence data returned by the server side are received, displaying the NDVI time sequence data in a preset graph and/or table mode.
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