KR101700798B1 - A geographic information providing method using dynamic parallel drawing of the space vector data - Google Patents

Abstract

Provided is a method of providing geographic information using a dynamic parallel drawing of spatial vector data capable of directly performing drawing in parallel by using a graphic buffer without waiting. The method of providing geographic information using a dynamic parallel drawing of spatial vector data allowing a cash sever having a geographic information system server, including a request receiving unit, a DB request unit, a threadpool control unit, and a drawing control unit, and a cash memory to provide a map image to a user terminal includes: a step (a) of, by the request receiving unit, receiving request space information required to generate a map image from the user terminal, parsing the information by layer, and requesting work assignment from the threadpool control unit; a step (b) of, by the threadpool control unit, assigning a work to a thread according to whether a valid thread exists in the thread pool by analyzing the parsed request space information, and fetching the spatial vector data of the request space information from a space DB server; a step (c) of, by the drawing control unit, generating a graphic object used for drawing by receiving the fetched spatial vector data and drawing and merging the graphic object in parallel using a map symbol; and a step (d) of returning the merged image to the user terminal.

Description

Technical Field [0001] The present invention relates to a geographic information providing method using a dynamic parallel drawing of spatial vector data,

The present invention relates to a geographic information providing method and, more particularly, to a geographical information providing method in which, when spatial data for dynamically drawing a map is requested to a user terminal, drawing is performed in parallel without waiting for fetching of spatial vector data of another layer, And more particularly, to a geographical information providing method using dynamic parallel drawing of space vector data capable of quickly responding to spatial data even when there is a large amount of data.

Generally, a geographic information system (GIS) means a system for managing geospatial data that can be used in terrain and facility related fields by building and processing geospatial data.

Specifically, it is designed to collect and analyze maps and geographical information used in the form of past prints by using a computer, and to collect, analyze and process data based on the obtained geographical information, Information system.

For example, in the case of on-site work based on geographical information such as inspection and maintenance of urban infrastructures such as road facilities, optical cable, water supply and sewage pipe, city gas pipe, oil pipeline, In this case, the geographical information system described above is used to obtain information on the geographical information of the corresponding site, and the work is performed.

These facilities should be precise location of each underground facility at the time of construction such as maintenance, restoration, addition of facilities, so that it can prevent large personal accident or economic loss in advance.

In particular, roads and water and wastewater facility management systems that manage urban infrastructure are developed and operated as client / server (C / S) environments.

Here, the client / server environment refers to an environment in which a client application program installed in a user computer operates as a process of responding information corresponding to a request from the remote server to the remote server through the network.

That is, the geographical information system requests the geographical information system server to inquire the geographical information system server and various electronic map layers, and transmits the overlapped map image to the client's browser in order of the requested layer.

FIG. 1 is a block diagram of a system for implementing a general geographical information providing method and includes a user terminal 10, a geographical information system server 20, and a spatial DB server 30.

2 is a flowchart illustrating an operation of generating an image using a vector drawing method when five layers are used according to the related art.

In the process of rendering a map image on the geographic information system server, the spatial data included in the coordinate area (BBOX) requested by the user is searched for each layer from the database management system storing the spatial information.

When the vector data to be drawn is fetched, the symbols are layered one by one in the order of the requested layers. After the images are sequentially nested in the graphic buffer according to the set information, the images are merged to form an image. The image is returned to the user.

The conventional vector drawing method fetches space vector data of all layers, waits for completion of fetching, and sequentially draws an image in units of a single layer.

For example, as shown in FIG. 2, in the case of five layers, a first value array 1 is recorded in a first record queue 1 in a first layer, and then a first render object queue Render object queue 1), it draws the first image (Draw 1) from the graphics buffer.

Then, when the second value array 2 is recorded in the second record queue 2 in the second layer and then converted into the second render object queue 2, if the fetch is completed in the graphics buffer Draws the second image (Draw 2) in superposition with the first image.

Then, similarly, the third to fifth value arrays (Value Array 3 to Value Array 5) are recorded in the third to fifth record queues (Record queue 3 to Record queue 5) in the third to fifth layers (Render object queue 3 to Record object queue 5) is overlaid with the second to fourth images (Draw 2 to Draw 4) in which the fetching is completed in the graphic buffer 50, And draws a fifth image (Draw 3 to Draw 5).

When the drawing of the fifth image (Draw 5) in which the first to fourth images (Draw 1 to Draw 4) are overlapped is completed, the first to fifth layers are merged to generate an image.

In this way, according to the conventional technique, the vector drawing method waits until the fetching of all the space vector data is completed. Therefore, when there is a lot of vector data to be drawn, the layer which has already completed the fetch must wait indefinitely until another layer is fetched There was a limit.

Accordingly, when the same area is repeatedly requested by various users, the time required to generate the final map image of the requested layer is delayed, so that quick response is impossible and the performance of the geographic information providing system is deteriorated.

In order to solve the above problem, the inventor of the present invention has proposed a method of rendering a map image in a geographic information providing system server by shortening the time for generating a final map image of a requested layer even when there are many space vector data to be drawn, The present invention has been developed to provide a geographical information providing method using dynamic parallel drawing of space vector data which can skip a fetching process from a spatial database and inquire and draw spatial data to be drawn directly from a cache server.

KR 10-0953190 B1

An object of the present invention is to provide a method and system for fetching space vector data fetched for space vector data drawing into a space vector data fetch of another layer when a user requests space data for dynamically drawing a map on a user terminal to a geographic information system server And to provide a method of providing geographical information using dynamic parallel drawing of space vector data that can be directly drawn in parallel using a graphic buffer without waiting.

The problem to be solved by the present invention is not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be clearly understood by a person skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method for providing geographic information using dynamic parallel drawing of spatial vector data, the geographic information providing method including a geographical information system server having a request receiving unit, a DB request unit, a thread pool control unit, and a drawing control unit, A geographical information providing method in which a server provides a map image to a user terminal, the method comprising the steps of: (a) receiving the request space information necessary for generating a map image from the user terminal and parsing the request space information for each layer; Requesting job assignment; (b) the thread pool control unit analyzes the parsed request space information and allocates a task to a thread according to whether a valid thread exists in the thread pool, and fetches space vector data of the request space information from the space DB server ; And (c) generating a graphic object to be used for drawing by receiving the fetched space vector data, and drawing and merging in parallel using a map symbol; and (d) returning the merged image to the user terminal.

According to another aspect of the present invention, there is provided a geographical information providing method using dynamic parallel drawing of spatial vector data, wherein the step (b) includes the steps of: (b-1) determining whether the thread pool exists in the thread pool ; (b-2) if the valid thread exists, the thread pool control unit performs the task allocation to the created thread; (b-3) the thread pool control unit connects the space DB server and performs primary fetching of space vector data of the requested space information; And (b-4) comparing the space vector data in the area to be drawn of the primary fetched spatial vector data by the thread pool control unit and performing a secondary fetching.

According to another aspect of the present invention, there is provided a method for providing geographic information using dynamic parallel drawing of spatial vector data, the method comprising: generating threads for the number of layers when the valid thread does not exist in the step (b-1) And returns to the data fetching step.

According to another aspect of the present invention, there is provided a geographical information providing method using dynamic parallel drawing of spatial vector data, wherein the step (c) includes: (c-1) Creating a graphic object; (c-2) the drawing controller receives the generated graphic object, retrieves and sets the map symbol from the database management system, and draws the map symbol in parallel for each layer; And (c-3) merging the parallel drawn images according to a requested layer order by the drawing control unit.

According to another aspect of the present invention, there is provided a method for providing geographic information using dynamic parallel drawing of spatial vector data, the method comprising: (a) when the drawing control unit returns a drawn map image from a thread allocated to each layer unit, Storing a graphic object in an array object; And causing the drawing control unit to return the completed thread to the thread pool so as to be reusable.

According to another aspect of the present invention, there is provided a method of providing geographic information using dynamic parallel drawing of spatial vector data, the method comprising: when spatial vector data of the generated graphic object is stored in the cache memory, The drawing control unit may proceed directly to the drawing step without passing the fetching process of the thread pool control unit when the spatial information is received.

The details of other embodiments are included in the detailed description and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and / or features of the present invention and the manner of achieving them will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is provided to fully explain the scope of the present invention to those skilled in the art.

According to the present invention, even when there is a lot of space vector data to be drawn in the process of rendering the map image in the geographic information providing system server, there is no need to wait indefinitely until the fetching of all the space vector data is completed, The time at which the final map image is generated is shortened and quick response is possible.

In addition, since the fetching process from the spatial database is omitted using the dynamic cache, the spatial data to be drawn can be retrieved from the cache server immediately, and the spatial data response performance can be improved by the time required for the fetching step.

1 is a block diagram of a system for implementing a general geographic information providing method.
2 is a flowchart illustrating an operation of generating an image using a vector drawing method when five layers are used according to the related art.
3 is a block diagram of a system for implementing geographic information providing method using dynamic parallel drawing of space vector data according to the present invention.
4 is an internal block diagram of the in-system geographic information system server 200 and the spatial DB server 300 shown in FIG.
5 is an internal block diagram of the cache server 400 in the system shown in FIG.
6 is a flowchart illustrating an operation of a method for providing geographic information using dynamic parallel drawing of space vector data according to the present invention.
FIG. 7 is a flowchart showing the detailed operation of step S500 in the flowchart shown in FIG.
8 is a flowchart illustrating an operation of generating an image when five layers are present according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor can properly define the concept of the term to describe its invention in the best way Should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms "part", "unit", "module", "device", "step", and the like described in the specification mean units for processing at least one function or operation, Lt; / RTI >

FIG. 3 is a block diagram of a system for implementing geographical information providing method using dynamic parallel drawing of space vector data according to the present invention. The user terminal 100, the geographic information system server 200, the spatial DB server 300, And a cache server 400.

FIG. 4 is an internal block diagram of the in-system geographic information system server 200 and the spatial DB server 300 shown in FIG. 3. The geographic information system server 200 includes a request receiving unit 210, a DB request unit 220, A thread pool control unit 230 and a drawing control unit 240. The spatial DB server 300 includes spatial vector data 310 and symbol information 320. [

FIG. 5 is an internal block diagram of the cache server 400 in the system shown in FIG. 3, and includes a cache memory 410 and a cache controller 420.

6 is a flowchart illustrating an operation of a method for providing geographic information using dynamic parallel drawing of space vector data according to the present invention.

FIG. 7 is a flowchart showing the detailed operation of step S500 in the flowchart shown in FIG.

8 is a flowchart illustrating an operation of generating an image when five layers are present according to an embodiment of the present invention.

The operation of the geographic information providing method using the dynamic parallel drawing of the space vector data according to the present invention will be described with reference to FIGS. 1 to 8 as follows.

First, it is assumed that a client requests information required for creating a map image, such as area coordinate information to be searched through the user terminal 100 and a layer list to be searched.

The request receiving unit 210 in the geographic information system server 200 receives request space information necessary for generating a map image from the user terminal 100 through wireless communication (S100), parses the requested request space information for each layer (S200), and requests a thread pool controller to allocate a job (S300).

The thread pool control unit 230 analyzes the request space information (S400) and determines whether or not there is an effective thread to which a task is not allocated in the thread pool (S510). If there is an effective thread in the thread pool, And assigns the job to the previously created thread (S530).

In order to process the work assigned to each thread, the spatial DB server 300 storing the space vector data 310 is connected (S540), and the space vector data 310 corresponding to the requested area from the client is connected to the primary fetch (S550).

If there is no valid thread in step S110, a thread is created by the number of layers and then the process returns to step S530.

Since we have assigned tasks to each thread, we proceed to prepare for rendering for rendering directly without waiting for fetch of space vector data 310 of another thread.

The primary fetched spatial vector data 310 extracts data to be drawn through a secondary fetching process by comparing only space vector data in the area to be drawn for drawing (S560).

At this time, the drawing controller 240 can proceed directly to the drawing process without the fetching process of the thread pool controller 230 using the dynamic cache in the primary fetch and the secondary fetch process.

That is, in the sequential process, the entire process, which is repeatedly performed each time a request is made, is stored in the cache memory 410 in advance without going through the above process, and the cached space vector data 310 is searched for, A dynamic cache can be used so that the user can proceed directly to the drawing process without going through the process.

On the other hand, when the fetching process for extracting only the space vector data 310 to be drawn is completed, the drawing control unit 240 transmits the extracted space vector data 310.

The drawing control unit 240 generates a graphic object to be used for actual drawing of the space vector data 310 (S600).

Graphic objects are created on a thread-by-thread basis and draw directly without waiting for other threads to complete their work.

That is, as shown in FIG. 7, in the case of five layers, a first value array (Value Array 1) is recorded in a first record queue (Record queue 1) in a first layer, and then a first render object queue 1), it draws the first image in the graphics buffer.

At the same time, in the second to fifth layers, the second to fifth value arrays (Value Array 2 to Value Array 5) are recorded in parallel in the second to fifth record queues (Record queue 2 to Record queue 5) (Render object queue 2 to Render object queue 5), the first to fifth images (Draw 1 to Draw 5) are drawn in the graphic buffer 50, respectively.

The first to fifth layers that have been drawn are merged together to generate an image (S700).

In order to draw the map image on the generated graphic object, the map symbol setting is searched from the database management system, and the map symbol value set according to the point, line, and plane is applied and drawn.

When the drawing is completed, the completed image is returned to the drawing control unit 240.

When the completed map image is returned from the thread assigned to each layer unit, the drawing control unit 240 stores the graphic object in the array object, and returns the completed thread to the thread pool so that it can be reused.

When all the images are received from all the threads, the images are sequentially merged according to the requested layer order and the merged image is returned to the user terminal 100 of the client (S800).

Accordingly, the present invention improves the performance of the geographic information providing system by fetching space vector data in parallel by layers using threads, and minimizing the work waiting time through a drawing process using multiple graphic objects.

As described above, in the geographical information providing method using dynamic parallel drawing of space vector data of the present invention, when a user requests spatial data for dynamically drawing a map on a user terminal to a geographic information system server, You can draw directly in parallel using the graphics buffer without waiting for the vector data fetched layer to fetch space vector data from another layer.

In this way, even if there is a lot of vector data to be drawn in the process of rendering the map image on the geographic information providing system server, there is no need to wait indefinitely until the fetching of all the space vector data is completed, Time is shortened and quick response is possible.

Also, since the fetching process from the spatial database is omitted using the dynamic cache, the spatial data to be drawn can be retrieved from the cache server immediately, and the spatial data response performance can be improved by the time required for the fetching step.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes, modifications, substitutions, and equivalents may be made therein without departing from the spirit and scope of the invention.

100: User terminal
200: Geographic Information System Server
210:
220: DB request unit
230: Thread Pool Control
240: Drawing control unit
300: Space DB server
310: Space vector data
320: Symbol information
400: cache server
410: Cache memory
420:

Claims (6)

A geospatial information providing method for providing a map image to a user terminal, the geospatial information system server having a request receiving unit, a DB request unit, a thread pool control unit and a drawing control unit, and a cache server having a cache memory,
(a) receiving, by the request receiver, request space information necessary for generating a map image from the user terminal, parsing the requested space information for each layer, and requesting the thread pool controller to assign a task;
(b) the thread pool control unit analyzes the parsed request space information and allocates a task to a thread according to whether a valid thread exists in the thread pool, and fetches space vector data of the request space information from the space DB server ;
(c) receiving, by the drawing control unit, the fetched space vector data to generate graphic objects to be used for drawing, drawing and merging in parallel using map symbols; And
(d) returning the merged image to the user terminal;
Lt; / RTI >
The step (b)
(b-1) the thread pool control unit determining whether the valid thread exists in the thread pool;
(b-2) if the valid thread exists, the thread pool control unit performs the task allocation to the created thread;
(b-3) the thread pool control unit connects the space DB server to perform primary fetching of space vector data of the requested space information; And
(b-4) comparing the spatial vector data in the area to be drawn of the primary fetched spatial vector data by the thread pool control unit and performing secondary fetching;
≪ / RTI >
Geographic Information Providing Method Using Dynamic Parallel Drawing of Spatial Vector Data.
delete The method according to claim 1,
In the step (b-1)
If there is no valid thread, returns to the space vector data fetching step after creating threads by the number of layers.
Geographic Information Providing Method Using Dynamic Parallel Drawing of Spatial Vector Data.
The method according to claim 1,
The step (c)
(c-1) generating the graphic object by receiving the secondary fetched spatial vector data by the drawing control unit;
(c-2) the drawing controller receives the generated graphic object, retrieves and sets the map symbol from the database management system, and draws the map symbol in parallel for each layer; And
(c-3) the drawing control unit merging the parallel drawn images according to a requested layer order;
≪ / RTI >
Geographic Information Providing Method Using Dynamic Parallel Drawing of Spatial Vector Data.
The method according to claim 1,
After the step (c)
Storing the graphic object in an array object when the drawing controller returns a drawn map image from a thread assigned to each layer unit; And
The drawing control unit returns the completed thread to the thread pool so as to be reusable;
Lt; RTI ID = 0.0 > 1, < / RTI &
Geographic Information Providing Method Using Dynamic Parallel Drawing of Spatial Vector Data.
The method according to claim 1,
When the space vector data of the generated graphic object is stored in the cache memory,
Wherein the drawing control unit directly goes to the drawing step without going through the fetch process of the thread pool control unit when receiving the space information after the space vector data is stored.
Geographic Information Providing Method Using Dynamic Parallel Drawing of Spatial Vector Data.

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