CN106611004A - POI (Point of Interest) attribute display method based on vector square grid - Google Patents
POI (Point of Interest) attribute display method based on vector square grid Download PDFInfo
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- CN106611004A CN106611004A CN201510702927.4A CN201510702927A CN106611004A CN 106611004 A CN106611004 A CN 106611004A CN 201510702927 A CN201510702927 A CN 201510702927A CN 106611004 A CN106611004 A CN 106611004A
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- 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
Abstract
The invention provides a POI (Point of Interest) attribute display method based on a vector square grid. The POI attribute display method comprises the steps of carrying out gridding processing on a map projection diagram; establishing a new map layer above the map projection diagram, and positioning to the grid Q; carrying out encoding on the grid Q; recording corresponding relationships between the grid Q and POIs P contained in the grid; based on the corresponding relationships, establishing a spatial index, wherein the spatial index records a mapping relationship between each of the POIs and a grid code to which the POI belongs; carrying out statistical analysis on all mapping relationships recorded by the spatial index to obtain statistical attributes for all POIs contained in the same grid, and taking the statistical attribute of the POI as a grid attribute; and based on a preset rendering rule, carrying out classification symbolization display on the grid attribute. The POI attribute display method has the following advantages: the effect of replacing element attributes of the POIs and traditional points by adopting surface elements represented by the grid is achieved; and thus, attribute information of the POIs can be observed more intuitively and conveniently, information and distribution rules hidden by the POIs are found conveniently, etc.
Description
Technical field
The invention belongs to survey and draw technical field of geographic information, and in particular to one kind is based on vector square grid
Points of interest attribute display methods.
Background technology
Point of interest (point of interest, POI) is a term in GIS-Geographic Information System, refers to all
Can be with the abstract geographic object to put, closely related geographical entity of more especially living with people, for example,
School, bank, restaurant, gas station, hospital, supermarket etc..Point of interest is mainly used for things or thing
The address of part is described, and can to a great extent strengthen descriptive power and inquiry to things or event location
Ability, improves the accuracy and speed of geo-location.
At present, exhibiting method of the point of interest in map projection's figure is mainly：According to the attribute information of point of interest,
Symbol is carried out to point of interest to render, then the correspondence geography position display in map projection's figure goes out the emerging of symbolism
It is interesting, effect point of interest being presented in map projection's figure is reached with this.By taking gas station's point of interest as an example,
Gas station's interest point symbol can be pre-defined, for example, round dot symbol, triangle point symbol or rectangle symbols etc.；
Then, directly in map projection, figure diverse geographic location shows gas station's symbol.As shown in figure 1, being point of interest
Tradition in map projection's figure represents schematic diagram.
Exhibiting method of the above-mentioned point of interest in map projection's figure, with reference to Fig. 1, mainly with following deficiency：
In the case of large scale, such as global all gas station's points of interest are presented in map projection's figure,
Because point of interest quantity is excessive, cause shown interest point symbol very mixed and disorderly, it is difficult to by observing map
Perspective view and know the regularity that point of interest is distributed, for example, gas station in which region gather, and at which
Region is sparse etc..
The content of the invention
For the defect that prior art is present, the present invention provides a kind of interest based on vector square grid
Point attribute display method, can effectively solving the problems referred to above.
The technical solution used in the present invention is as follows：
The present invention provides a kind of points of interest attribute display methods based on vector square grid, including following
Step：
Step 1, three-dimensional map is projected to plane, obtains map projection's figure；Wherein, the map projection
Include multiple interest point identifications shown in a form, also, the actual geographic of each point of interest in figure
Coordinate (X, Y) is given value；
Step 2, predefines the grid radius r values of square grid, and carries out grid to map projection's figure
Change is processed；
Step 3, in the map projection's figure after grid, chooses any point and is defined as initial coordinate origin O,
The actual geographic coordinate value of initial coordinate origin O is (X0, Y0)；If initial coordinate origin O places lattice
The grid coordinate value of net is (R0, C0), also, R0=0, C0=0, its implication is：R0Represent initial coordinate
The line number of origin O places grid, C0The row number of initial coordinate origin O places grid is represented, i.e.,：Initial coordinate
Origin O places grid is the grid of the row of the 0th row the 0th；
Step 4, in the map projection's figure after grid, for each point of interest shown in a form,
Point of interest P is designated as, following operation is performed both by：
Step 4.1, the actual geographic coordinate value of point of interest P is (XP, YP) and for given value；
Step 4.2, is calculated grid coordinate value (Rs of the point of interest P relative to initial coordinate origin OP, CP)；
Wherein, RPRepresent grid line numbers of the point of interest P relative to initial coordinate origin O；CPRepresent point of interest P relative to
The grid row number of initial coordinate origin O；The affiliated grid of point of interest P is designated as into grid Q；
Step 4.3, according to grid line number R of affiliated grid Q of point of interest PPWith grid row number CP, it is calculated lattice
Actual geographic coordinate value (the X of the grid central point O ' of net QO’, YO’)；
Step 4.4, according to the actual geographic coordinate value (X of grid central point O 'O’, YO’), it is calculated lattice
The actual geographic coordinate value on four summits of net Q；
Step 4.5, in the top of map projection's figure new figure layer is set up, and in the new figure layer, navigates to grid
Four summits of Q, finally draw out grid Q；
Meanwhile, grid Q is encoded so as to unique encoded radio；And record grid Q and wrapped with it
The corresponding relation of the point of interest P for containing；
Step 5, thus, sets up spatial index, and the spatial index records each point of interest and its affiliated grid
Mapping relations between coding；
The all mapping relations recorded to spatial index carry out statistical analysis, obtain what same grid was included
The statistical attribute of all points of interest, and using the statistical attribute of the point of interest as grid attribute；
Step 6, based on default rule is rendered, and grid attribute is carried out into classification symbolization and is shown.
Preferably, in step 1, three-dimensional map is projected to plane, specially：
Using Mercator projection mode, three-dimensional map is projected to plane.
Preferably, in step 4.2, by below equation, point of interest P is calculated relative to initial coordinate origin
Grid coordinate value (the R of OP, CP)：
RP=│ Y0-YP│÷2r+1；
CP=│ X0-XP│÷2r+1。
Preferably, in step 4.3, by below equation, it is calculated the reality of the grid central point O ' of grid Q
Border geographic coordinate values (XO’, YO’)：
XO’=2r CP-r+X0；
YO’=Y0-2r RP+r。
Preferably, in step 5, the statistical attribute of all points of interest that same grid is included includes：
The quantity of all points of interest that same grid is included.
What the present invention was provided is had following excellent based on the points of interest attribute display methods of vector square grid
Point：
The present invention counts the statistics of the point of interest that each grid is included first by map projection's map grid networking
Attribute, then, by the statistical attribute of point of interest corresponding grid is assigned to, and reaches the face represented using grid
Key element replace point of interest conventional point component attributes effect, therefore, can more intuitive and convenient observe point of interest
Attribute information, the hiding information of point of interest easy to find and the regularity of distribution etc..
Description of the drawings
Fig. 1 represents schematic diagram for tradition of the point of interest in map projection's figure；
The flow process of the points of interest attribute display methods based on vector square grid that Fig. 2 is provided for the present invention
Schematic diagram；
Demarcation examples of the Fig. 3 for the initial coordinate origin O for providing of the invention in map projection's figure；
Demarcation examples of the Fig. 4 for any point of interest P for providing of the invention in map projection's figure；
Fig. 5 for the present invention provide according to grid central point O ' be calculated grid Q four summit M1,
The schematic diagram of the actual geographic coordinate value of M2, M3, M4；
Fig. 6 is that the present invention renders the points of interest attribute display schematic diagram for obtaining.
Specific embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect become more apparent, with
Lower combination drawings and Examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific embodiment only to explain the present invention, be not intended to limit the present invention.
The present invention provides a kind of points of interest attribute display methods based on vector square grid, and it thinks substantially
Lu Wei：
In map projection's figure, grid will be carried out by statistical regions, and count that each grid included it is emerging
The statistical attribute of interest point, then, by the statistical attribute of point of interest corresponding grid is assigned to, and is reached and is adopted lattice
The face key element that netlist is shown replaces the effect of point of interest conventional point component attributes, due to showing interest using face key element
Point statistical attribute, therefore, can more intuitive and convenient observe point of interest attribute information, it is easy to find emerging
The hiding information of interest point and the regularity of distribution etc..
With reference to Fig. 2, the points of interest attribute display methods based on vector square grid provided for the present invention
Schematic flow sheet, specifically includes following steps：
Step 1, three-dimensional map is projected to plane, obtains map projection's figure；Wherein, the map projection
Include multiple interest point identifications shown in a form, also, the actual geographic of each point of interest in figure
Coordinate (X, Y) is given value；
In this step, Mercator projection mode can be adopted, three-dimensional map is projected to plane.Mercator
Projection：Also known as " isogonism positive axis conic projection ", by Dutch map scholar Mercator (Mercator) in 1569
Draft, it is assumed that the earth is enclosed in a hollow cylinder, and its equator contacts with cylinder, it is then imaginary again
Earth center has a lamp, in the graphic projection on sphere to cylinder, then cylinder is launched, and this is just
It is " Mercator projection " world map for drawing out that a width standard parallel is zero degree (i.e. equator).
Step 2, predefines the grid radius r values of square grid, and carries out grid to map projection's figure
Change is processed；
Step 3, in the map projection's figure after grid, chooses any point and is defined as initial coordinate origin O,
The actual geographic coordinate value of initial coordinate origin O is (X0, Y0)；If initial coordinate origin O places lattice
The grid coordinate value of net is (R0, C0), also, R0=0, C0=0, its implication is：R0Represent initial coordinate
The line number of origin O places grid, C0The row number of initial coordinate origin O places grid is represented, i.e.,：Initial coordinate
Origin O places grid is the grid of the row of the 0th row the 0th；
It is demarcation examples of the initial coordinate origin O in map projection's figure with reference to Fig. 3.Herein, initial coordinate
Origin O is a bit arbitrarily selected in map projection's figure.
Step 4, in the map projection's figure after grid, for each point of interest shown in a form,
Point of interest P is designated as, is demarcation examples of any point of interest P in map projection's figure with reference to Fig. 4；Hold
The following operation of row：
Step 4.1, the actual geographic coordinate value of point of interest P is (XP, YP) and for given value；
Step 4.2, is calculated grid coordinate value (Rs of the point of interest P relative to initial coordinate origin OP, CP)；
Wherein, RPRepresent grid line numbers of the point of interest P relative to initial coordinate origin O；CPRepresent point of interest P relative to
The grid row number of initial coordinate origin O；The affiliated grid of point of interest P is designated as into grid Q；
Specifically, grid of the point of interest P relative to initial coordinate origin O can be calculated by below equation
Coordinate value (RP, CP)：
RP=│ Y0-YP│÷2r+1；
CP=│ X0-XP│÷2r+1。
Step 4.3, according to grid line number R of affiliated grid Q of point of interest PPWith grid row number CP, it is calculated lattice
Actual geographic coordinate value (the X of the grid central point O ' of net QO’, YO’)；
Specifically, the actual geographic coordinate of the grid central point O ' of grid Q can be calculated by below equation
Value (XO’, YO’)：
XO’=2r CP-r+X0；
YO’=Y0-2r RP+r。
Step 4.4, according to the actual geographic coordinate value (X of grid central point O 'O’, YO’), it is calculated lattice
The actual geographic coordinate value on four summits of net Q；
Refer to Fig. 5, be according to grid central point O ' be calculated four summit M1 of grid Q, M2, M3,
The schematic diagram of the actual geographic coordinate value of M4, it is only necessary to can be calculated according to trigonometric function relation, here
No longer describe in detail.
Step 4.5, in the top of map projection's figure new figure layer is set up, and in the new figure layer, navigates to grid
Four summits of Q, finally draw out grid Q；
Meanwhile, grid Q is encoded so as to unique encoded radio；And record grid Q and wrapped with it
The corresponding relation of the point of interest P for containing；
Step 5, thus, sets up spatial index, and the spatial index records each point of interest and its affiliated grid
Mapping relations between coding；
The all mapping relations recorded to spatial index carry out statistical analysis, obtain what same grid was included
The statistical attribute of all points of interest, for example, the quantity of all points of interest that same grid is included, and should
The statistical attribute of point of interest is used as grid attribute；
Step 6, based on default rule is rendered, and grid attribute is carried out into classification symbolization and is shown.
For example, for different grid, the point of interest quantity that can be included according to it is rendered into different face
Color, basic thought can be：Comprising point of interest quantity it is more, color is deeper.It is this with reference to Fig. 6
It is bright to render the points of interest attribute display schematic diagram for obtaining.
As can be seen here, the points of interest attribute display methods based on vector square grid that the present invention is provided,
With advantages below：
The present invention counts the statistics of the point of interest that each grid is included first by map projection's map grid networking
Attribute, then, by the statistical attribute of point of interest corresponding grid is assigned to, and reaches the face represented using grid
Key element replace point of interest conventional point component attributes effect, therefore, can more intuitive and convenient observe point of interest
Attribute information, the hiding information of point of interest easy to find and the regularity of distribution etc..
The above is only the preferred embodiment of the present invention, it is noted that common for the art
For technical staff, under the premise without departing from the principles of the invention, some improvements and modifications can also be made,
These improvements and modifications should also regard protection scope of the present invention.
Claims (5)
1. a kind of points of interest attribute display methods based on vector square grid, it is characterised in that include
Following steps：
Step 1, three-dimensional map is projected to plane, obtains map projection's figure；Wherein, the map projection
Include multiple interest point identifications shown in a form, also, the actual geographic of each point of interest in figure
Coordinate (X, Y) is given value；
Step 2, predefines the grid radius r values of square grid, and carries out grid to map projection's figure
Change is processed；
Step 3, in the map projection's figure after grid, chooses any point and is defined as initial coordinate origin O,
The actual geographic coordinate value of initial coordinate origin O is (X0, Y0)；If initial coordinate origin O places lattice
The grid coordinate value of net is (R0, C0), also, R0=0, C0=0, its implication is：R0Represent initial coordinate
The line number of origin O places grid, C0The row number of initial coordinate origin O places grid is represented, i.e.,：Initial coordinate
Origin O places grid is the grid of the row of the 0th row the 0th；
Step 4, in the map projection's figure after grid, for each point of interest shown in a form,
Point of interest P is designated as, following operation is performed both by：
Step 4.1, the actual geographic coordinate value of point of interest P is (XP, YP) and for given value；
Step 4.2, is calculated grid coordinate value (Rs of the point of interest P relative to initial coordinate origin OP, CP)；
Wherein, RPRepresent grid line numbers of the point of interest P relative to initial coordinate origin O；CPRepresent point of interest P relative to
The grid row number of initial coordinate origin O；The affiliated grid of point of interest P is designated as into grid Q；
Step 4.3, according to grid line number R of affiliated grid Q of point of interest PPWith grid row number CP, it is calculated lattice
Actual geographic coordinate value (the X of the grid central point O ' of net QO’, YO’)；
Step 4.4, according to the actual geographic coordinate value (X of grid central point O 'O’, YO’), it is calculated lattice
The actual geographic coordinate value on four summits of net Q；
Step 4.5, in the top of map projection's figure new figure layer is set up, and in the new figure layer, navigates to grid
Four summits of Q, finally draw out grid Q；
Meanwhile, grid Q is encoded so as to unique encoded radio；And record grid Q and wrapped with it
The corresponding relation of the point of interest P for containing；
Step 5, thus, sets up spatial index, and the spatial index records each point of interest and its affiliated grid
Mapping relations between coding；
The all mapping relations recorded to spatial index carry out statistical analysis, obtain what same grid was included
The statistical attribute of all points of interest, and using the statistical attribute of the point of interest as grid attribute；
Step 6, based on default rule is rendered, and grid attribute is carried out into classification symbolization and is shown.
2. the points of interest attribute display methods based on vector square grid according to claim 1,
Characterized in that, in step 1, three-dimensional map is projected to plane, specially：
Using Mercator projection mode, three-dimensional map is projected to plane.
3. the points of interest attribute display methods based on vector square grid according to claim 1,
Characterized in that, in step 4.2, by below equation, being calculated point of interest P relative to initial coordinate origin
Grid coordinate value (the R of OP, CP)：
RP=│ Y0-YP│÷2r+1；
CP=│ X0-XP│÷2r+1。
4. the points of interest attribute display methods based on vector square grid according to claim 1,
Characterized in that, in step 4.3, by below equation, being calculated the reality of the grid central point O ' of grid Q
Border geographic coordinate values (XO’, YO’)：
XO’=2r CP-r+X0；
YO’=Y0-2r RP+r。
5. the points of interest attribute display methods based on vector square grid according to claim 1,
Characterized in that, in step 5, the statistical attribute of all points of interest that same grid is included includes：
The quantity of all points of interest that same grid is included.
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