CN107608010A - A kind of urban water affairs rainfall isoplethes drawing method and drawing system - Google Patents
A kind of urban water affairs rainfall isoplethes drawing method and drawing system Download PDFInfo
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- CN107608010A CN107608010A CN201710945885.6A CN201710945885A CN107608010A CN 107608010 A CN107608010 A CN 107608010A CN 201710945885 A CN201710945885 A CN 201710945885A CN 107608010 A CN107608010 A CN 107608010A
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- rainfall
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- isopleth
- urban water
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Abstract
The invention discloses a kind of urban water affairs rainfall isoplethes drawing method, wherein, the urban water affairs rainfall isoplethes drawing method includes：Determine the drafting demand of urban water affairs rainfall isopleth；Obtain the rainfall monitoring point on map；According to the rainfall monitoring point got and the drafting demand of urban water affairs rainfall isopleth is combined, sets rainfall to monitor and looks into benefit point；Determine that the numerical value for mending point is looked into the rainfall monitoring；Benefit point is looked into according to the rainfall monitoring point and rainfall monitoring and carries out isopleth computing；Isoplethes drawing is carried out according to the result of the isopleth computing.The invention also discloses a kind of urban water affairs rainfall isoplethes drawing system.Urban water affairs rainfall isoplethes drawing method provided by the invention has the fast advantage of easy arithmetic speed.
Description
Technical field
The present invention relates to meteorology technical field, more particularly to a kind of urban water affairs rainfall isoplethes drawing method and one
Kind urban water affairs rainfall isoplethes drawing system.
Background technology
Rainfall is the information-based important climatic elements of watermark protocol, and the isopleth for fast and accurately drawing rainfall region can be with
Accurately hold local rain fall.
The drafting of isopleth of the prior art is generally more complicated, and suitable environment is single, therefore, how quick simple
Just the isohyet that carries out is drawn as those skilled in the art's technical problem urgently to be resolved hurrily.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art, there is provided a kind of urban water affairs rainfall
Isoplethes drawing method and a kind of urban water affairs rainfall isoplethes drawing system, to solve the problems of the prior art.
As the first aspect of the invention, there is provided a kind of urban water affairs rainfall isoplethes drawing method, wherein, it is described
Urban water affairs rainfall isoplethes drawing method includes：
Determine the drafting demand of urban water affairs rainfall isopleth；
Obtain the rainfall monitoring point on map；
According to the rainfall monitoring point got and the drafting demand of urban water affairs rainfall isopleth is combined, rainfall is set
Benefit point is looked into amount monitoring；
Determine that the numerical value for mending point is looked into the rainfall monitoring；
Benefit point is looked into according to the rainfall monitoring point and rainfall monitoring and carries out isopleth computing；
Isoplethes drawing is carried out according to the result of the isopleth computing.
Preferably, the drafting demand of the urban water affairs rainfall isopleth includes：Rainfall of different drainage areas etc.
It is worth the rainfall isoplethes drawing of line drafting and different rainfall measuring point numbers.
Preferably, the urban water affairs rainfall isoplethes drawing method also includes the rainfall on the acquisition map
Carried out before the step of monitoring point：
Bitmap or GIS-Geographic Information System are loaded as base map；
According to the rainfall monitoring station of reality, rainfall monitoring station position is positioned on map, obtains rainfall monitoring point.
Preferably, the numerical value for determining that benefit point is looked into the rainfall monitoring includes：
By the way that to closing on, monitoring point carries out arithmetic mean, true rainfall is simulated in distance weighted or single-point assignment operation；
Obtain the rainfall monitoring and look into the numerical value for mending point.
As the second aspect of the invention, there is provided a kind of urban water affairs rainfall isoplethes drawing system, wherein, it is described
Urban water affairs rainfall isoplethes drawing system includes：
Demand determining module, the demand determining module are used for the drafting demand for determining urban water affairs rainfall isopleth；
Acquisition module, the acquisition module are used to obtain the rainfall monitoring point on map；
Setup module, the setup module are used for according to the rainfall monitoring point got and combine urban water affairs rainfall
The drafting demand of isopleth, set rainfall to monitor and look into benefit point；
Numerical value determining module, the numerical value determining module are used to determine that the numerical value for mending point is looked into the rainfall monitoring；
Isopleth computing module, the isopleth computing module are used for according to the rainfall monitoring point and the rainfall
Monitoring looks into benefit point and carries out isopleth computing；
Isoplethes drawing module, the isoplethes drawing module are used to carry out equivalence according to the result of the isopleth computing
Line is drawn.
Urban water affairs rainfall isoplethes drawing method provided by the invention, different drainage areas, difference can be applied to
The isohyet of rainfall measuring point number is drawn, and fast with arithmetic speed, and isopleth is round and smooth, the line style advantage attractive in appearance close to reality,
In addition, urban water affairs rainfall isoplethes drawing method provided by the invention can not only be based on all GIS platforms
On, it is also applied for drawing on bitmap.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the flow chart of urban water affairs rainfall isoplethes drawing method provided by the invention.
Fig. 2 is that rainfall monitoring point provided by the invention sets schematic diagram.
Fig. 3 looks into benefit point for monitoring provided by the invention and sets schematic diagram.
Fig. 4 is that provided by the invention look into mends the triangulation network schematic diagram after point is set.
Fig. 5 is the schematic diagram after Equivalence Operation provided by the invention and drafting.
Fig. 6 is that isopleth provided by the invention tentatively draws schematic diagram.
Fig. 7 is the schematic diagram of isopleth provided by the invention.
Fig. 8 is the equivalent cut-point schematic diagram centered on upper pass provided by the invention.
Fig. 9 is the preliminary schematic diagram of isoplethes drawing centered on upper pass provided by the invention.
Figure 10 is the once-through operation coordinate diagram of trilinear exponential smoothing provided by the invention.
Figure 11 is the secondary computing coordinate diagram of trilinear exponential smoothing provided by the invention.
Figure 12 is the computing coordinate diagram three times of trilinear exponential smoothing provided by the invention.
Figure 13 is that two broken line provided by the invention draws schematic diagram.
Figure 14 is the tri linear schematic diagram of computing first provided by the invention generation.
Figure 15 is five broken line schematic diagrames of secondary computing generation provided by the invention.
Figure 16 is nine broken line schematic diagrames of computing three times provided by the invention generation.
Figure 17 is line charts of the Fig. 9 provided by the invention after trilinear exponential smoothing.
Figure 18 is the isogram of closed curve provided by the invention.
Figure 19 is the isogram of open curve provided by the invention.
Figure 20 is the isogram after open curve provided by the invention coloring.
Figure 21 is the isogram after trilinear exponential smoothing shown in Fig. 6 provided by the invention.
Figure 22 is the structural representation of urban water affairs rainfall isoplethes drawing system provided by the invention.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
As the first aspect of the invention, there is provided a kind of urban water affairs rainfall isoplethes drawing method, wherein, such as scheme
Shown in 1, the urban water affairs rainfall isoplethes drawing method includes：
S110, the drafting demand for determining urban water affairs rainfall isopleth；
Rainfall monitoring point on S120, acquisition map；
S130, according to the rainfall monitoring point that gets and the drafting demand of urban water affairs rainfall isopleth is combined, if
Put rainfall monitoring and look into benefit point；
S140, determine that the numerical value for mending point is looked into the rainfall monitoring；
S150, benefit point progress isopleth computing is looked into according to the rainfall monitoring point and rainfall monitoring；
S160, according to the result of the isopleth computing carry out isoplethes drawing.
Urban water affairs rainfall isoplethes drawing method provided by the invention, different drainage areas, difference can be applied to
The isohyet of rainfall measuring point number is drawn, and fast with arithmetic speed, and isopleth is round and smooth, the line style advantage attractive in appearance close to reality,
In addition, urban water affairs rainfall isoplethes drawing method provided by the invention can not only be based on all GIS platforms
On, it is also applied for drawing on bitmap.
Specifically, the drafting demand of the urban water affairs rainfall isopleth includes：Rainfall of different drainage areas etc.
It is worth the rainfall isoplethes drawing of line drafting and different rainfall measuring point numbers.
Specifically, the urban water affairs rainfall isoplethes drawing method also includes the rainfall on the acquisition map
Carried out before the step of monitoring point：
Bitmap or GIS-Geographic Information System are loaded as base map；
According to the rainfall monitoring station of reality, rainfall monitoring station position is positioned on map, obtains rainfall monitoring point.
Further specifically, as shown in Fig. 2 the round dot in figure is the rainfall monitoring point set, it is preferable that rainfall monitoring
The quantity of point is 10.Set rainfall monitoring point isogram generally to be drawn on map on map, therefore need to load first
Bitmap or GIS-Geographic Information System, further according to the rainfall monitoring station of reality, position rainfall monitoring as base map on map
Station location.
Preferably, as shown in figure 3, setting monitoring to look into benefit point, because isoplethes drawing is only limited in triangle, 10 are passed through
Monitoring point structure triangle can be seen that exist part basin can not drawing isoline region.Therefore, it is necessary to up flow
Set rainfall to monitor in domain and look into benefit point.According to vision needs, two are additionally arranged in case and looks into benefit point, 11 and 12 numberings look into benefit
Point.Fig. 4 is to be additionally arranged 2 to look into the triangulation network mended and built after point.From fig. 4, it can be seen that based on the isopleth built in triangle
Full basin can substantially be covered.
Specifically, the numerical value for determining that benefit point is looked into the rainfall monitoring includes：
By the way that to closing on, monitoring point carries out arithmetic mean, true rainfall is simulated in distance weighted or single-point assignment operation；
Obtain the rainfall monitoring and look into the numerical value for mending point.
The rainfall monitoring point that point is not reality is mended due to looking into, it is without real rainfall product data source.Therefore, Ke Yitong
Cross and close on monitoring point the real rainfall of simulation is made it have by the methods of arithmetic average, distance weighted, single-point assignment.
Specifically, as shown in figure 5, being isopleth computing and drafting, Fig. 5 includes the rainfall value of simulation, and the three of structure
Angle net, isopleth and isopleth value.
Specific setting principle is described in detail with reference to Fig. 6 to Fig. 9.Each triangle clicks through according to each triangle
Row etc. point segmentation, considers full figure minimum rainfall and most rainfalls, carries out triangle sideline etc. point segmentation.Specifically, fruit river
Bridge 24 is worth minimum, upper to close 300 value maximums.A usual figure draws level Four isopleth better appearance, therefore according to minimax rainfall
Amount, it is 65 to set contour interval to be worth.Each grade point is 80,145,210,275.
As shown in fig. 7, to take the explanation that the periphery triangle centered on upper pass is carried out.According to 80,145,210,275
Segmentation, equivalent cut-point is marked according to line length and both ends point value.
Shown in Fig. 8, most of triangle line segment is split by 210 and 275 isopleth.According to equivalent triangle projective planum principle：
In a triangle projective planum, there are both sides in identical value simultaneously.Therefore only needing each triangle isopleth being connected to be linked to be
Isogram.
It is isopleth blank shown in Fig. 9, then can uses 3 triple smoothings, you can draw out round and smooth attractive in appearance
Isopleth.
Further specifically, shown trilinear exponential smoothing：General principle is exactly by three adjacent points, i.e., two foldings
Line, nine round and smooth broken lines are expanded to by computing three times.
With reference to Figure 10 to Figure 12 coordinate graph of a relation, the computing to trilinear exponential smoothing is described in detail.
As shown in Figure 10, it is the once-through operation coordinate diagram of trilinear exponential smoothing, 2 lines become 3 lines after once-through operation：
D=3*A/4+B/4；
E=A/4+3*B/4；
F=3*B/4+C/4；
G=B/4+3*C/4.
As shown in figure 11, it is the secondary computing coordinate diagram of trilinear exponential smoothing, 3 lines become 6 lines after secondary computing：
H=3*D/4+E/4；
I=D/4+3*E/4；
J=3*E/4+F/4；
K=E/4+3*F/4；
L=3*F/4+G/4；
M=F/4+3*G/4.
As shown in figure 12, it is the computing coordinate diagram three times of trilinear exponential smoothing, 6 lines become 8 lines after computing three times：
N=3*H/4+I/4；
O=H/4+3*I/4；
P=3*I/4+J/4；
Q=I/4+3*J/4；
R=3*J/4+K/4；
S=J/4+3*K/4；
T=3*K/4+L/4；
U=K/4+3*L/4；
V=3*L/4+M/4；
W=L/4+3*M/4.
Further specifically, as shown in figure 13, with original coordinates point：A (100,400), B (500,100), C (900,400)
Two broken lines：
As shown in figure 14, the generation of computing first tri linear：
As shown in figure 15, secondary computing generates five broken lines：
As shown in figure 16, computing generates nine broken lines three times, basically reaches round and smooth purpose：
As shown in figure 17, it is line charts of the Fig. 9 after trilinear exponential smoothing.
Figure 18 is the isogram of closed curve, and Figure 19 is the isogram of open curve, and Figure 20 colours for open curve
Isogram afterwards, Figure 21 are the isogram after trilinear exponential smoothing shown in Fig. 6.
As the second aspect of the invention, there is provided a kind of urban water affairs rainfall isoplethes drawing system, wherein, such as scheme
Shown in 22, the urban water affairs rainfall isoplethes drawing system 10 includes：
Demand determining module 110, the demand determining module 110 are used for the drafting for determining urban water affairs rainfall isopleth
Demand；
Acquisition module 120, the acquisition module 120 are used to obtain the rainfall monitoring point on map；
Setup module 130, the setup module 130 are used for according to the rainfall monitoring point got and combine urban water affairs
The drafting demand of rainfall isopleth, set rainfall to monitor and look into benefit point；
Numerical value determining module 140, the numerical value determining module 140 are used to determine that the number for mending point is looked into the rainfall monitoring
Value；
Isopleth computing module 150, the isopleth computing module 150 are used for according to the rainfall monitoring point and described
Rainfall monitoring looks into benefit point and carries out isopleth computing；
Isoplethes drawing module 160, the isoplethes drawing module 160 are used to be entered according to the result of the isopleth computing
Row isoplethes drawing.
Urban water affairs rainfall isoplethes drawing system provided by the invention, different drainage areas, difference can be applied to
The isohyet of rainfall measuring point number is drawn, and fast with arithmetic speed, and isopleth is round and smooth, the line style advantage attractive in appearance close to reality,
In addition, urban water affairs rainfall isoplethes drawing system provided by the invention can not only be based on all GIS platforms
On, it is also applied for drawing on bitmap.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, but the invention is not limited in this.For those skilled in the art, the essence of the present invention is not being departed from
In the case of refreshing and essence, various changes and modifications can be made therein, and these variations and modifications are also considered as protection scope of the present invention.
Claims (5)
- A kind of 1. urban water affairs rainfall isoplethes drawing method, it is characterised in that the urban water affairs rainfall isopleth is painted Method processed includes：Determine the drafting demand of urban water affairs rainfall isopleth；Obtain the rainfall monitoring point on map；According to the rainfall monitoring point got and the drafting demand of urban water affairs rainfall isopleth is combined, sets rainfall to supervise Check and examine benefit point；Determine that the numerical value for mending point is looked into the rainfall monitoring；Benefit point is looked into according to the rainfall monitoring point and rainfall monitoring and carries out isopleth computing；Isoplethes drawing is carried out according to the result of the isopleth computing.
- 2. urban water affairs rainfall isoplethes drawing method according to claim 1, it is characterised in that the urban water affairs The drafting demand of rainfall isopleth includes：The drop of the rainfall isoplethes drawing of different drainage areas and different rainfall measuring point numbers Precipitation isohyetal line is drawn.
- 3. urban water affairs rainfall isoplethes drawing method according to claim 1, it is characterised in that the urban water affairs Rainfall isoplethes drawing method also includes what is carried out the step of rainfall monitoring point on the acquisition map before：Bitmap or GIS-Geographic Information System are loaded as base map；According to the rainfall monitoring station of reality, rainfall monitoring station position is positioned on map, obtains rainfall monitoring point.
- 4. urban water affairs rainfall isoplethes drawing method according to claim 1, it is characterised in that described in the determination The numerical value that benefit point is looked into rainfall monitoring includes：By the way that to closing on, monitoring point carries out arithmetic mean, true rainfall is simulated in distance weighted or single-point assignment operation；Obtain the rainfall monitoring and look into the numerical value for mending point.
- 5. a kind of urban water affairs rainfall isoplethes drawing system, it is characterised in that the urban water affairs rainfall isopleth is painted System processed includes：Demand determining module, the demand determining module are used for the drafting demand for determining urban water affairs rainfall isopleth；Acquisition module, the acquisition module are used to obtain the rainfall monitoring point on map；Setup module, the setup module are used for according to the rainfall monitoring point got and combine urban water affairs rainfall equivalence The drafting demand of line, set rainfall to monitor and look into benefit point；Numerical value determining module, the numerical value determining module are used to determine that the numerical value for mending point is looked into the rainfall monitoring；Isopleth computing module, the isopleth computing module are used to be monitored according to the rainfall monitoring point and the rainfall Look into benefit point and carry out isopleth computing；Isoplethes drawing module, the isoplethes drawing module are used to be painted according to the result of isopleth computing progress isopleth System.
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| CN109241369A (en) * | 2018-08-02 | 2019-01-18 | 中国水利水电科学研究院 | Rainfall isopleth construction method based on grid stretching method |
| CN109326200A (en) * | 2018-08-09 | 2019-02-12 | 深圳市法本信息技术股份有限公司 | Map rendering implementation method, server and the system of rainfall |
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