CN108460061A - A kind of Method of Loading Digital Map and electronic map terminal - Google Patents
A kind of Method of Loading Digital Map and electronic map terminal Download PDFInfo
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- CN108460061A CN108460061A CN201710097429.0A CN201710097429A CN108460061A CN 108460061 A CN108460061 A CN 108460061A CN 201710097429 A CN201710097429 A CN 201710097429A CN 108460061 A CN108460061 A CN 108460061A
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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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Abstract
The present invention relates to a kind of Method of Loading Digital Map and electronic map terminal, wherein this method includes：Determine the screen border for the terminal for showing electronic map；The range of the screen overlay electronic figure for the terminal for showing electronic map is obtained according to the screen border；Covering is added in the range of the overlay electronic figure and is shown.The present invention shows the terminal screen size of electronic map by acquisition and determines the range for the terminal screen overlay electronic figure for showing electronic map, the only covering in load visual range, the covering of longitude and latitude except visual range directly filters, it can solve map and load inefficiency caused by a large amount of coverings, the problem of interim card, loading velocity is optimized, the user experience is improved.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of Method of Loading Digital Map and electronic map terminal.
Background technology
This part is introduced to reader may be with the relevant background technology of various aspects of the invention, it is believed that can be carried to reader
For useful background information, to contribute to reader to more fully understand various aspects of the invention.It is, therefore, to be understood that our department
Point explanation be for the above purpose, and not constitute admission of prior art.
Electronic map, also referred to as numerical map, are to utilize computer technology, the map for storing and searching in a digital manner.Profit
With the data-handling capacity of computer, more quick location information search may be implemented in electronic map, user-friendly.
Data organization is one of core of electronic map.Rational data organization can make data in navigation electronic map complete
Face, relationship is clear, and data redundancy amount is small.Write software based on rational electronic map data tissue, speed is fast, precision
Height is easier to develop the works of hommization.The features such as real-time of map of navigation electronic, requires the main of its data organization
Feature is exactly：Simply, topological relation is clear.
Existing map datum loading technique has the shortcomings that, since the memory size of existing map terminal is very limited,
A large amount of map datum can not possibly be stored in memory, so needing through spatial index and grid in each map operation
When whole deletions first are carried out to the map datum of last time load, reload whole map datums that current operation needs, deleting
With inevitably had during load a large amount of identical element objects by reverse cyclic loadings with delete, to affect map datum plus
Carry efficiency.
When needing to load big data quantity, the server end generation plotting figure layer is slower, time-consuming more, works as client
When holding continuous moving map position, ceaselessly it can ask to service to server end, client will appear white screen phenomenon at this time,
It just will appear map for a moment, traditional map is all icons of load when loading a large amount of coverings, is counted when especially map moves
Calculation amount is bigger, and algorithm is relative complex, and it is poor to go out figure efficiency.
Therefore, the data load magnitude and loading efficiency for how improving electronic map, improve the client stand-by period, are these
Field technology personnel technical problem urgently to be resolved hurrily.
Invention content
Technical problems to be solved are how to provide a kind of Method of Loading Digital Map and electronic map terminal.
For the defects in the prior art, a kind of Method of Loading Digital Map of present invention offer and electronic map terminal, can
Quickly to load map covering.
In a first aspect, the present invention provides a kind of Method of Loading Digital Map, including：
Determine the screen border for the terminal for showing electronic map；
The range of the screen overlay electronic figure for the terminal for showing electronic map is obtained according to the screen border；
Covering is added in the range of the overlay electronic figure and is shown.
Optionally, the screen border of the terminal of the determining display electronic map includes：
Obtain the screen width or height of the terminal for showing electronic map.
Optionally, the model of the screen overlay electronic figure that the terminal for showing electronic map is obtained according to the screen border
Enclose including：
Obtain the longitude and latitude at first turning of the terminal for showing electronic map；
Obtain the longitude and latitude at second turning of the terminal for showing electronic map；
Display is determined according to the longitude and latitude of the screen border, the longitude and latitude at second turning and first turning electronically
The range of the terminal screen overlay electronic figure of figure；Wherein,
First turning and second turning are diagonal.
Optionally, further include：
Obtain the center point coordinate of current display electronic map；
Judge whether the coordinate of current display device electronic map central point changes；
Map is reloaded if variation.
On the other hand, the present invention also provides a kind of electronic map terminals, including：
Screen border determination unit, the screen border for determining the terminal for showing electronic map；
Coverage area determination unit, the screen for obtaining the terminal for showing electronic map according to the screen border cover
The range of electronic chart；
Map loading unit, for adding covering in the range of the overlay electronic figure and showing.
Optionally, the screen border determination unit includes：
Screen size acquiring unit, the screen width or height of the terminal for obtaining display electronic map.
Optionally, the coverage area determination unit includes：
Longitude and latitude acquiring unit, for obtains show electronic map terminal first turning longitude and latitude and second
The longitude and latitude at turning, wherein first turning and second turning are diagonal；
Positioning unit is covered, for the warp according to the longitude and latitude and first turning of the screen border, second turning
Latitude determines the range for the terminal screen overlay electronic figure for showing electronic map.
Optionally, further include：
Neutral point coordinates acquiring unit, the center point coordinate for obtaining current display electronic map；
The certain determination unit of map, for judging whether the coordinate of current display device electronic map central point changes；Such as
Map is then reloaded in fruit variation.
As shown from the above technical solution, the Method of Loading Digital Map and electronic map terminal that the present invention supplies are aobvious by obtaining
Show the terminal screen size of electronic map and determine the range for the terminal screen overlay electronic figure for showing electronic map, only load can
Depending on the covering in range, the covering of the longitude and latitude except visual range directly filters, and it is a large amount of can to solve map load
The problem of inefficiency caused by covering, interim card, loading velocity is optimized, the user experience is improved.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to make one simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of Method of Loading Digital Map flow diagram in one embodiment of the invention；
Fig. 2 is to obtain the screen width for the terminal for showing electronic map in present invention embodiment shown in FIG. 1 or highly flow
Journey schematic diagram；
Fig. 3 is the screen overlay electronic figure that the terminal for showing electronic map is obtained in present invention embodiment shown in FIG. 1
Range flow diagram；
Fig. 4, Fig. 5 are to obtain screen comer latitude and longitude coordinates flow diagram in present invention embodiment shown in FIG. 1；
Fig. 6 is that covering article coordinate schematic diagram is obtained in present invention embodiment shown in FIG. 1；
Fig. 7 be judge in present invention embodiment shown in FIG. 1 covering whether screen overlay electronic figure range flow
Schematic diagram；
Fig. 8, Fig. 9 are to obtain center point coordinate flow diagram in present invention embodiment shown in FIG. 1；
Figure 10 is the flow diagram for reloading covering in present invention embodiment shown in FIG. 1 after moving map；
Figure 11 is a kind of electronic map terminal structural schematic diagram during the present invention one is implemented.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of Method of Loading Digital Map, including：Determine the terminal for showing electronic map
Screen border；The range of the screen overlay electronic figure for the terminal for showing electronic map is obtained according to the screen border；Institute
It states addition covering in the range of overlay electronic figure and shows.The present invention and the Method of Loading Digital Map provided are unfolded below
Detailed description.
First, the screen border for determining the terminal for showing electronic map is introduced.
The determination shows that the screen border of the terminal of electronic map includes：Obtain the screen for the terminal for showing electronic map
Width or height.As shown in Fig. 2, in the present invention, DisplayMetrics is obtained using android sdk methods, such
WidthPixels is screen width, and heightPixels is screen height.Screen can be determined by the width and height of screen
Boundary.
Secondly, the model for the screen overlay electronic figure that the terminal for showing electronic map is obtained according to the screen border is introduced
It encloses.
Specifically, as shown in figure 3, in the present invention, the terminal for showing electronic map is obtained according to the screen border
The range of screen overlay electronic figure includes：Obtain the longitude and latitude at first turning of the terminal for showing electronic map；Obtain display
The longitude and latitude at second turning of the terminal of electronic map；According to the screen border, the longitude and latitude and first at second turning
The longitude and latitude at a turning determines the range for the terminal screen overlay electronic figure for showing electronic map；Wherein, first turning
It is diagonal with second turning.
Such as：As shown in figure 4, screen top left co-ordinate is (0,0), the coordinate on map and screen has a mapping relations,
That is Projection calls the fromScreenLocation methods of Projection can be by screen coordinate according to mapping relations
It is converted into map latitude and longitude coordinates.Screen lower right corner longitude and latitude is obtained as shown in figure 5, can similarly do.It should be appreciated that
The present invention is not limited only to this, obtains the upper right corner and the present invention still may be implemented in the diagonal longitude and latitude in two, the lower left corner.
As shown in fig. 6, each covering (in figure at A), there are one latitude and longitude coordinates, which only needs to meet corresponding
Condition i.e. indicate the point in screen ranges.Specifically as shown in fig. 7, for example whether the latitude of the point is more than the latitude of bottom right angle point
It spends and less than the latitude in the upper left corner, whether the longitude of the point is more than the longitude in the upper left corner and the longitude responsibility less than the lower right corner
Current point is positioned in screen ranges.If current point in screen ranges, loads the corresponding covering of current point and shows,
Otherwise it is not loaded with.
In the present invention, further include：Obtain the center point coordinate of current display electronic map；Judge current display device electricity
Whether the coordinate of sub- map center point changes；Map is reloaded if variation.If user drags ground in use
Figure, then need that further the covering of the load in electronic map is recalculated and loaded.Specifically, detection ground is current in real time
The coordinate of display device electronic map central point.For example, as shown in Figure 8, Figure 9, after the completion of loading map, can adjust back
OnMapStatusChangeFinish methods contain the latitude and longitude coordinates information of central point in parameter status.
As shown in Figure 10, when map moves, onMapStatusChangeFinish methods can be adjusted back, are then repeated
Step is stated to currently showing that the covering of the range of the terminal screen overlay electronic figure of electronic map reloads,
OnMapStatusChangeFinish methods are the sdk that existing map provides.
Further to embody the superiority of Method of Loading Digital Map provided by the invention, the present invention is provided in a kind of application
The electronic map terminal of Method of Loading Digital Map is stated, as shown in figure 11, which includes：Screen border determines single
Member, the screen border for determining the terminal for showing electronic map；Coverage area determination unit, for according to the screen border
Obtain the range of the screen overlay electronic figure for the terminal for showing electronic map；Map loading unit, in the overlay electronic
Covering is added in the range of figure and is shown.Detailed description is unfolded to the present invention and the electronic map terminal provided below.This
The course of work for inventing the electronic map terminal provided is similar with Method of Loading Digital Map flow, can refer to the present invention and provide
Method of Loading Digital Map, no longer repeat one by one again.
In the present invention, the screen border determination unit includes：Screen size acquiring unit shows electronics for obtaining
The screen width or height of the terminal of map.Specifically, as shown in Fig. 2, in the present invention, being obtained using android sdk methods
DisplayMetrics is taken, such widthPixels is screen width, and heightPixels is screen height.Pass through screen
Width and height can determine the boundary of screen.
In the present invention, the coverage area determination unit includes：Longitude and latitude acquiring unit, for obtaining display electronically
The longitude and latitude of the longitude and latitude and second turning at first turning of the terminal of figure, wherein first turning and second
Turning is diagonal；Positioning unit is covered, for according to the longitude and latitude of the screen border, second turning and first turning
Longitude and latitude determines the range for the terminal screen overlay electronic figure for showing electronic map.Specifically, as shown in figure 3, in the present invention,
Show that the range of the screen overlay electronic figure of the terminal of electronic map includes according to screen border acquisition：It obtains and shows electronics
The longitude and latitude at first turning of the terminal of map；Obtain the longitude and latitude at second turning of the terminal for showing electronic map；Root
The end panel for showing electronic map is determined according to the longitude and latitude of the screen border, the longitude and latitude at second turning and first turning
The range of curtain overlay electronic figure；Wherein, first turning and second turning are diagonal.
Such as：Screen top left co-ordinate as shown in Figure 4 is (0,0), and the coordinate on map and screen has a mapping relations, i.e.,
Projection calls the fromScreenLocation methods of Projection that can turn screen coordinate according to mapping relations
Turn to map latitude and longitude coordinates.Screen lower right corner longitude and latitude is obtained as shown in figure 5, can similarly do.It should be appreciated that this
Invention is not limited only to this, obtains the upper right corner and the present invention still may be implemented in the diagonal longitude and latitude in two, the lower left corner.
As shown in fig. 6, each covering (in figure at A), there are one latitude and longitude coordinates, which only needs to meet corresponding
Condition i.e. indicate the point in screen ranges.Specifically as shown in fig. 7, for example whether the latitude of the point is more than the latitude of bottom right angle point
It spends and less than the latitude in the upper left corner, whether the longitude of the point is more than the longitude in the upper left corner and the longitude responsibility less than the lower right corner
Current point is positioned in screen ranges.If current point in screen ranges, loads the corresponding covering of current point and shows,
Otherwise it is not loaded with.
In the present invention, electronic map terminal further includes：Neutral point coordinates acquiring unit, for obtaining current display electronics
The center point coordinate of map；The certain determination unit of map, for judging that the coordinate of current display device electronic map central point is
No variation；Map is reloaded if variation.Specifically, the seat of the current display device electronic map central point in ground is detected in real time
Mark.For example, as shown in Figure 8, Figure 9, after the completion of loading map, onMapStatusChangeFinish methods, parameter can be adjusted back
The latitude and longitude coordinates information of central point is contained in status.As shown in Figure 10, it when map moves, can adjust back
Then onMapStatusChangeFinish methods repeat the above steps to currently showing that the terminal screen of electronic map covers
The covering of the range of electronic chart reloads, and onMapStatusChangeFinish methods are the sdk that existing map provides.
In conclusion Method of Loading Digital Map provided by the invention and electronic map terminal, electronics is shown by acquisition
The terminal screen size of map and the range for determining the terminal screen overlay electronic figure for showing electronic map only load visual range
The covering of interior covering, the longitude and latitude except visual range directly filters, and can solve map and load a large amount of coverings
Caused by inefficiency, the problem of interim card, optimize loading velocity, the user experience is improved.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, the application can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to method, the flow of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.The fingers such as term "upper", "lower"
The orientation or positional relationship shown is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplifies
Description, does not indicate or imply the indicated device or element must have a particular orientation, with specific azimuth configuration and behaviour
Make, therefore is not considered as limiting the invention.Unless otherwise clearly defined and limited, term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；Can be
Mechanical connection can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two
Connection inside element.For the ordinary skill in the art, above-mentioned term can be understood at this as the case may be
Concrete meaning in invention.
In the specification of the present invention, numerous specific details are set forth.Although it is understood that the embodiment of the present invention can
To put into practice without these specific details.In some instances, well known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this description.Similarly, it should be understood that disclose in order to simplify the present invention and helps to understand respectively
One or more of a inventive aspect, in the above description of the exemplary embodiment of the present invention, each spy of the invention
Sign is grouped together into sometimes in single embodiment, figure or descriptions thereof.However, should not be by the method solution of the disclosure
It releases and is intended in reflection is following：The feature that i.e. the claimed invention requirement ratio is expressly recited in each claim is more
More features.More precisely, as the following claims reflect, inventive aspect is to be less than single reality disclosed above
Apply all features of example.Therefore, it then follows thus claims of specific implementation mode are expressly incorporated in the specific implementation mode,
Wherein each claim itself is as a separate embodiment of the present invention.It should be noted that in the absence of conflict, this
The feature in embodiment and embodiment in application can be combined with each other.The invention is not limited in any single aspect,
It is not limited to any single embodiment, is also not limited to the arbitrary combination and/or displacement of these aspects and/or embodiment.And
And can be used alone of the invention each aspect and/or embodiment or with other one or more aspects and/or its implement
Example is used in combination.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover in the claim of the present invention and the range of specification.
Claims (8)
1. a kind of Method of Loading Digital Map, which is characterized in that including：
Determine the screen border for the terminal for showing electronic map；
The range of the screen overlay electronic figure for the terminal for showing electronic map is obtained according to the screen border；
Covering is added in the range of the overlay electronic figure and is shown.
2. Method of Loading Digital Map according to claim 1, which is characterized in that the determining end for showing electronic map
The screen border at end includes：
Obtain the screen width or height of the terminal for showing electronic map.
3. Method of Loading Digital Map according to claim 1, which is characterized in that described to be obtained according to the screen border
Show that the range of the screen overlay electronic figure of the terminal of electronic map includes：
Obtain the longitude and latitude at first turning of the terminal for showing electronic map；
Obtain the longitude and latitude at second turning of the terminal for showing electronic map；
It is determined according to the longitude and latitude of the screen border, the longitude and latitude at second turning and first turning and shows electronic map
The range of terminal screen overlay electronic figure；Wherein,
First turning and second turning are diagonal.
4. Method of Loading Digital Map according to claim 1, which is characterized in that further include：
Obtain the center point coordinate of current display electronic map；
Judge whether the coordinate of current display device electronic map central point changes；
Map is reloaded if variation.
5. a kind of electronic map terminal, which is characterized in that including：
Screen border determination unit, the screen border for determining the terminal for showing electronic map；
Coverage area determination unit, the screen overlay electronic for obtaining the terminal for showing electronic map according to the screen border
The range of figure；
Map loading unit, for adding covering in the range of the overlay electronic figure and showing.
6. Method of Loading Digital Map according to claim 5, which is characterized in that the screen border determination unit packet
It includes：
Screen size acquiring unit, the screen width or height of the terminal for obtaining display electronic map.
7. Method of Loading Digital Map according to claim 5, which is characterized in that the coverage area determination unit packet
It includes：
Longitude and latitude acquiring unit, the longitude and latitude at first turning of the terminal for obtaining display electronic map and second turning
Longitude and latitude, wherein first turning and second turning are diagonal；
Positioning unit is covered, for the longitude and latitude according to the longitude and latitude and first turning of the screen border, second turning
Determine the range for the terminal screen overlay electronic figure for showing electronic map.
8. Method of Loading Digital Map according to claim 5, which is characterized in that further include：
Neutral point coordinates acquiring unit, the center point coordinate for obtaining current display electronic map；
The certain determination unit of map, for judging whether the coordinate of current display device electronic map central point changes；If become
Map is then reloaded in change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710097429.0A CN108460061A (en) | 2017-02-22 | 2017-02-22 | A kind of Method of Loading Digital Map and electronic map terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710097429.0A CN108460061A (en) | 2017-02-22 | 2017-02-22 | A kind of Method of Loading Digital Map and electronic map terminal |
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| CN201710097429.0A Pending CN108460061A (en) | 2017-02-22 | 2017-02-22 | A kind of Method of Loading Digital Map and electronic map terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111858795A (en) * | 2020-06-16 | 2020-10-30 | 北京金茂绿建科技有限公司 | Map loading processing method and device |
| CN113769402A (en) * | 2021-09-16 | 2021-12-10 | 厦门极致互动网络技术股份有限公司 | Method for updating visible region of geodetic map in frames |
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| CN105575254A (en) * | 2014-11-11 | 2016-05-11 | 高德信息技术有限公司 | Electronic map road rendering method and apparatus |
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| CN102446203A (en) * | 2010-10-13 | 2012-05-09 | 北京高维信诚资讯有限公司 | Method and device for obtaining map |
| US20160320197A1 (en) * | 2011-02-02 | 2016-11-03 | Mapquest, Inc. | Systems and methods for generating electronic map displays with points-of-interest information |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111858795A (en) * | 2020-06-16 | 2020-10-30 | 北京金茂绿建科技有限公司 | Map loading processing method and device |
| CN113769402A (en) * | 2021-09-16 | 2021-12-10 | 厦门极致互动网络技术股份有限公司 | Method for updating visible region of geodetic map in frames |
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