CN110580274B - GIS data rendering method - Google Patents
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- CN110580274B CN110580274B CN201910864421.1A CN201910864421A CN110580274B CN 110580274 B CN110580274 B CN 110580274B CN 201910864421 A CN201910864421 A CN 201910864421A CN 110580274 B CN110580274 B CN 110580274B
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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
- G06F16/24—Querying
- G06F16/248—Presentation of query results
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The application discloses a data rendering method, which belongs to the technical field of geographic information systems; a data rendering method includes the steps that data are obtained from a database according to the range of a current screen, after task division is conducted on the obtained data, whether the data are vector data or not is judged, and if the data are the vector data, a drawing task is executed after compression; otherwise, directly executing the drawing task; or when the temporary primitive task appears, executing the drawing task; when a gap exists in the executed drawing task, if a user touches a screen or zooms the screen, the drawing task is terminated, otherwise, the next drawing task is continuously executed; if the user loosens the touch screen, restarting; when the execution of each drawing task is finished, finishing the drawing; the GIS data display method has fast and efficient display performance, particularly can be used for displaying GIS data with large data volume, can be used for fast loading and displaying, and cannot cause the phenomenon of jamming or dead halt.
Description
Technical Field
The invention relates to the technical field of geographic information systems, in particular to a GIS data rendering method.
Background
With the continuous development of mobile GIS, i.e., geographic information systems, GIS data rendering, acquisition and editing platforms based on large data volumes of mobile terminals are often applied to field data investigation and acquisition work. The field data investigation and collection work is carried out, and workers often need to carry remote sensing images and corresponding interior data to field work for data display, collection and editing; in the aspect of data display, for the geographic information data with large data volume, the existing mobile GIS platform is difficult to carry out quick loading display, and even situations such as blockage and crash can occur sometimes. And the inconvenience is often brought to field investigators, the data browsing experience is influenced, and the working efficiency is reduced.
Disclosure of Invention
In view of the problems of slow display, easy blockage, crash and the like of a GIS platform in the prior art, the GIS data rendering method is expected to be provided.
The invention is realized by the following technical scheme:
a method of GIS data rendering comprising the operations of:
s10) acquiring a data source for displaying at the mobile terminal
When loading and displaying GIS data, the mobile terminal firstly acquires and displays data corresponding to the current screen range, and screens out data required for drawing through space query in a file database according to the current screen range condition;
s20) carrying out task division on data needing to be rendered
Dividing the acquired data source into tasks;
if the acquired data source is vector data, recording in a form of a plurality of task arrays, wherein each task array records at least one piece of data until the acquired vector data is divided;
if the acquired data source is the grid slice, recording in the form of a plurality of task arrays, wherein each task array records a plurality of pieces of data until the acquired grid slice data is divided;
s30) data compression is carried out on the vector data
Performing data compression processing on the vector data according to the size of the pixel of the screen of the mobile terminal;
the data compression processing comprises the following steps: calculating the distance between adjacent nodes, if the distance between two adjacent nodes is smaller than the pixel resolution of the current screen, only one node is reserved, all adjacent nodes are sequentially judged, and finally only one node in one pixel is determined;
s40) temporary primitive task
The mobile terminal always detects the coordinate change of the temporary graphic primitive on the screen, and if the coordinate changes, a temporary graphic primitive drawing task is generated and added into the current drawing task S50);
s50) executing the rendering task
Drawing according to the existing drawing tasks, executing one drawing task each time, and displaying on a screen after drawing is finished;
a drawing gap judgment S60 is carried out in the middle of each two times of drawing task execution);
s60) drawing task gap judgment
After the current drawing task is executed, the mobile terminal judges whether a user touches or zooms a screen; if the user touches or zooms the screen, terminating the subsequent drawing task;
if the user does not touch or zoom the screen, judging whether all the drawing tasks are executed or not, and if the user has any drawing tasks, jumping to S50) to execute the drawing tasks and circulate; if all the drawing tasks are executed, the drawing is finished, and the process enters S70);
s70) displaying the drawn picture on the screen
And the mobile terminal finishes all rendering processes, and the drawn picture is displayed on the screen.
The data required by subsequent drawing screened in the S10) are as follows: and carrying out space query in a database through the geographic range of the latitude and longitude range to obtain GIS data in the latitude and longitude range.
And the vector data in the S20) is composed of point, line and plane vector data.
And S20) performing task division on the data to be rendered, wherein the task division step comprises the following steps:
if the vector data are the vector data, recording in a form of a plurality of task arrays, wherein each task array records 128 pieces of data until the obtained vector data are divided;
and if the grid slice is the grid slice, recording in a form of a plurality of task arrays, wherein each task array records 2 pieces of data until the obtained grid slice data is divided.
And after the data division in the S20) is completed, rendering the divided data task by task.
And the node reserved in the S30) is the node closest to the center of the screen pixel, and the judging method is as follows: the mobile terminal calculates the distance between two adjacent nodes and compares the distance with the current screen pixel size, if the distance between the two nodes is smaller than the current screen pixel size, one node is removed, otherwise, the two nodes are displayed.
The generation of the temporary primitive in S40) is:
when the mobile terminal renders data, the GPS positioning point data is displayed on a screen in real time to form data of temporary graphic elements.
The task execution interval in the step S60) is as follows: and the middle gap is formed after the last drawing task is executed and before the next drawing task is executed.
The step of judging whether the user touches or zooms the screen in S60) is:
terminating execution of a subsequent rendering task when the user touches the screen;
when the user zooms the screen with the finger, zooming the currently drawn graph according to the user operation;
when the user finger leaves the screen, the graph drawn by the current screen is cleared, and the step S10 is skipped to enter the rendering process again.
Compared with the prior art, the invention has the beneficial effects that:
the display method has the advantages that the display performance is high, particularly, the display can be quickly loaded and displayed aiming at the display of GIS data with large data volume, and the phenomenon of blocking or crash can not occur; because only the data in the current display range of the screen of the mobile terminal is read each time in a space query mode, the data volume is greatly reduced from a data source, the data rendering efficiency is improved, and the problems of slow rendering speed, blockage, crash and the like of the GIS data with large data volume in the rendering process are solved; because the data dividing mode is adopted, only data in one drawing task is read each time when drawing is executed, the memory pressure is greatly reduced, the drawing process of the graph is smoother, and the problems of memory overflow, blockage, halt and the like in the drawing process are solved; due to the adoption of the drawing task gap judging mode, when a user touches and zooms the screen, the subsequent drawing task can be terminated in time, so that the rendering process is smoother, and the user experience effect is better.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a method for rendering GIS data includes the operations of:
s10) acquiring a data source for displaying at the mobile terminal
When loading and displaying GIS data, the mobile terminal firstly acquires and displays data corresponding to the current screen range, and screens out data required for drawing through space query in a file database according to the current screen range condition;
s20) carrying out task division on data needing to be rendered
Dividing the acquired data source into tasks;
if the acquired data source is vector data, recording in a form of a plurality of task arrays, wherein each task array records at least one piece of data until the acquired vector data is divided;
if the acquired data source is the raster slice, recording in the form of a plurality of task arrays, and recording a plurality of pieces of data by each task array until the acquired raster slice data is divided;
s30) data compression is carried out on the vector data
Performing data compression processing on the vector data according to the size of the pixel of the screen of the mobile terminal;
the data compression processing comprises the following steps: calculating the distance between adjacent nodes, if the distance between two adjacent nodes is less than the current screen pixel resolution, only one node is reserved, all adjacent nodes are sequentially judged, and finally only one node in one pixel is determined;
s40) temporary primitive task
The mobile terminal always detects the coordinate change of the temporary primitive on the screen, and if the coordinate changes, a temporary primitive drawing task is generated and added into the current drawing task S50);
s50) executing the rendering task
Drawing according to the existing drawing tasks, executing one drawing task each time, and displaying on a screen after drawing is finished;
a drawing gap judgment S60 is carried out in the middle of each two times of drawing task execution);
s60) drawing task gap judgment
After the current drawing task is executed, the mobile terminal judges whether a user touches or zooms a screen; if the user touches or zooms the screen, terminating the subsequent drawing task;
if the user does not touch or zoom the screen, judging whether all the drawing tasks are executed or not, and if the user has any drawing tasks, jumping to S50) to execute the drawing tasks and circulate; if all the drawing tasks are executed, the drawing is finished, and the process enters S70);
s70) displaying the drawn picture on the screen
And the mobile terminal completes all rendering processes, and the drawn picture is displayed on the screen.
Specific examples are given below.
The GIS data rendering method comprises the following operations:
s10) acquiring a data source for displaying at the mobile terminal
When loading and displaying GIS data, the mobile terminal firstly acquires and displays data corresponding to the current screen range, and screens out only data required for drawing through space query in a file database according to the current screen range condition; when GIS data with large data volume is displayed, if all data in the file database are rendered each time, great requirements on the performance and rendering speed of the mobile terminal are inevitably met; and step S10 only acquires the data to be drawn in the current screen range, so that the rendering workload is reduced to the greatest extent from the data source, the rendering speed is increased, and the pressure on the mobile terminal is reduced.
S20) carrying out task division on data needing to be rendered
Dividing the acquired data source into tasks;
if the acquired data source is vector data, recording in a form of a plurality of task arrays, wherein each task array records at least one piece of data until the acquired vector data is divided;
if the acquired data source is the grid slice, recording in the form of a plurality of task arrays, wherein each task array records a plurality of pieces of data until the acquired grid slice data is divided; if the data obtained in step S10 is still the GIS data with a large data size, and the rendering workload cannot be reduced, and the pressure on the mobile terminal cannot be reduced, a task division manner is adopted, and the rendering can be performed task by task, so that the rendering process is better and smooth, and the mobile terminal cannot be jammed or halted.
S30) data compression is carried out on the vector data
Performing data compression processing on the vector data according to the pixel size of the screen of the mobile terminal;
the data compression processing comprises the following steps: calculating the distance between adjacent nodes, if the distance between two adjacent nodes is smaller than the pixel resolution of the current screen, only one node is reserved, all adjacent nodes are sequentially judged, and finally only one node in one pixel is determined; by adopting a vector data compression mode, data redundancy can be reduced, the drawing workload is reduced, and the rendering efficiency is improved.
S40) temporary primitive task
If the temporary primitive exists, the mobile terminal always detects the coordinate change of the temporary primitive on the screen, and if the coordinate changes, a temporary primitive drawing task is generated and added into the current drawing task S50;
s50) executing the rendering task
Drawing according to the existing drawing tasks, executing one drawing task each time, and displaying on a screen after drawing is finished;
in the middle of each two times of drawing task execution, a drawing gap judgment S60 is carried out;
s60) drawing task gap judgment
After the current drawing task is executed, the mobile terminal judges whether a user touches or zooms a screen; if the user touches or zooms the screen, terminating the subsequent drawing task;
if the user does not touch or zoom the screen, judging whether all the drawing tasks are executed or not, and if the user has any drawing tasks, jumping to S50 to execute the drawing tasks for circulation; if all the drawing tasks are executed, the drawing is finished, and S70 is entered; in the data rendering process, a user may continuously perform touch or zoom operations on a screen, if a conventional rendering mode is adopted, the rendering process is very slow when the next rendering process is performed after one rendering is finished, and particularly when a large amount of GIS data is rendered, the user experience effect is poor and the rendering efficiency is low. And when the user touches or zooms the screen in a mode of judging the drawing task gap, the rendering process can be terminated in time, and the next rendering can be rapidly started. The rendering process is more flexible, the rendering efficiency is higher, and the user experience is better.
S70) displaying the drawn picture on the screen
And the mobile terminal completes all rendering processes, and the drawn photos are displayed on the screen.
The display method has fast and efficient display performance, particularly can be used for fast loading and displaying GIS data with large data volume, and does not have the phenomenon of jamming or dead halt; because only the data in the current display range of the screen of the mobile terminal is read each time in a space query mode, the data volume is greatly reduced from a data source, the data rendering efficiency is improved, and the problems of slow rendering speed, blockage, crash and the like of the GIS data with large data volume in the rendering process are solved; because the data dividing mode is adopted, only data in one drawing task is read each time when drawing is executed, the memory pressure is greatly reduced, the drawing process of the graph is smoother, and the problems of memory overflow, blockage, halt and the like in the drawing process are solved; due to the adoption of the drawing task gap judging mode, when a user touches and zooms the screen, the subsequent drawing task can be terminated in time, so that the rendering process is smoother, and the user experience effect is better.
S10), screening out the data required by the subsequent drawing as follows: and carrying out space query in a database through the geographic range of the latitude and longitude range to obtain GIS data in the latitude and longitude range.
And S20) the vector data consists of point, line and plane vector data.
S20) carrying out task division on data needing rendering, wherein the task division comprises the following steps:
if the acquired data source is vector data, recording in a form of a plurality of task arrays, wherein each task array records 128 pieces of data until the acquired vector data are divided;
and if the acquired data source is the raster slice, recording the data in the form of a plurality of task arrays, wherein each task array records 2 pieces of data until the acquired raster slice data is completely divided.
And S20), rendering the divided data task by task after the data are divided.
S30), reserving a node which is the closest node to the center of the screen pixel, wherein the judging method comprises the following steps: the mobile terminal calculates the distance between two adjacent nodes and compares the distance with the current screen pixel size, if the distance between the two nodes is smaller than the current screen pixel size, one node is removed, otherwise, the two nodes are displayed.
The temporary primitive unit generating step in S40) is:
when the mobile terminal renders data, the GPS positioning point data is displayed on a screen in real time to form temporary primitive data.
The task execution interval in S60) is as follows: a middle gap is formed after the execution of the previous drawing task is finished and before the execution of the next drawing task; and when the user touches or zooms the screen in a mode of judging the drawing task gap, the rendering process can be terminated in time, and the next rendering can be rapidly started. The rendering process is more flexible, the rendering efficiency is higher, and the user experience is better.
S60) judging whether the user touches or zooms the screen comprises the following steps:
terminating execution of a subsequent rendering task when the user touches the screen;
when the user's finger zooms the screen, the currently drawn graphics are zoomed according to the user operation.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A GIS data rendering method is characterized in that: the method comprises the following operations:
s10) acquiring a data source for displaying at the mobile terminal
When loading and displaying GIS data, the mobile terminal firstly acquires and displays data corresponding to the current screen range, and screens out data required for drawing through space query in a file database according to the current screen range condition;
s20) carrying out task division on data needing to be rendered
Dividing the acquired data source into tasks;
if the acquired data source is vector data, recording in a form of a plurality of task arrays, wherein each task array records at least one piece of data until the acquired vector data is divided;
if the acquired data source is the grid slice, recording in the form of a plurality of task arrays, wherein each task array records a plurality of pieces of data until the acquired grid slice data is divided;
s30) data compression is carried out on the vector data
Performing data compression processing on the vector data according to the pixel size of the screen of the mobile terminal;
the data compression processing comprises the following steps: calculating the distance between adjacent nodes, if the distance between two adjacent nodes is smaller than the pixel resolution of the current screen, only one node is reserved, all adjacent nodes are sequentially judged, and finally only one node in one pixel is determined;
s40) temporary primitive task
The mobile terminal always detects the coordinate change of the temporary primitive on the screen, and if the coordinate changes, a temporary primitive drawing task is generated and added into the current drawing task S50);
the temporary primitive is generated as: when the mobile terminal renders data, GPS positioning point data is displayed on a screen in real time to form data of temporary graphic primitives;
s50) executing the rendering task
Drawing according to the existing drawing tasks, executing one drawing task each time, and displaying on a screen after drawing is completed;
a drawing gap judgment S60 is carried out in the middle of each two times of drawing task execution);
s60) drawing task gap judgment
After the current drawing task is executed, the mobile terminal judges whether a user touches or zooms a screen; if the user touches or zooms the screen, terminating the subsequent drawing task;
if the user does not touch or zoom the screen, judging whether all the drawing tasks are executed or not, and if the user has any drawing tasks, jumping to S50) to execute the drawing tasks and circulate; if all the drawing tasks are executed, the drawing is finished, and the process enters S70);
s70) displaying the drawn picture on the screen
And the mobile terminal completes all rendering processes, and the drawn picture is displayed on the screen.
2. The GIS data rendering method of claim 1, wherein: the data required by subsequent drawing screened in the S10) are as follows: and carrying out space query in a database through the geographic range of the latitude and longitude range to obtain GIS data in the latitude and longitude range.
3. The GIS data rendering method of claim 1, wherein: and the vector data in the S20) is composed of point, line and plane vector data.
4. The GIS data rendering method of claim 1, wherein:
and S20) performing task division on the data to be rendered, wherein the task division step comprises the following steps:
if the vector data are the vector data, recording the vector data in a form of a plurality of task arrays, wherein each task array records 128 pieces of data until the obtained vector data are divided;
and if the grid slice is the grid slice, recording in a form of a plurality of task arrays, wherein each task array records 2 pieces of data until the obtained grid slice data is divided.
5. The GIS data rendering method of claim 1 or 4, wherein:
and after the data division in the S20) is completed, rendering the divided data task by task.
6. The GIS data rendering method of claim 1, wherein:
and the node reserved in the S30) is the node closest to the center of the screen pixel, and the judging method is as follows: the mobile terminal calculates the distance between two adjacent nodes and compares the distance with the current screen pixel size, if the distance between the two nodes is smaller than the current screen pixel size, one node is removed, otherwise, the two nodes are displayed.
7. The GIS data rendering method of claim 1, wherein:
the task execution interval in the step S60) is as follows: and a middle gap is formed after the last drawing task is executed and before the next drawing task is executed.
8. The GIS data rendering method of claim 1, wherein:
the step of judging whether the user touches or zooms the screen in the step S60) is:
terminating execution of a subsequent rendering task when the user touches the screen;
when the user zooms the screen with the finger, zooming the currently drawn graph according to the user operation;
when the user finger leaves the screen, the graph drawn by the current screen is cleared, and the step S10 is skipped to enter the rendering process again.
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