CN104780345B - A kind of safe city control point evaluation of layout method based on GIS - Google Patents
A kind of safe city control point evaluation of layout method based on GIS Download PDFInfo
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Abstract
The present invention relates to a kind of safe city control point evaluation of layout method based on GIS, including：The geo-spatial data in city is obtained by GIS interface modules；Obtain its control point position data；Effective overlay area of video camera is calculated according to control point position data, calculates the number of recurrences weights of control point；According to road network topology structure and the number of recurrences weight computing fidelity factor of each control point；Position, direction, effective overlay area, fidelity factor and the corresponding path of control point video camera are shown in GIS map；City for being monitored point arrangement, user judges whether fidelity factor is up to standard according to the fidelity factor, if judged result is no, control point position is carried out perfect；Newly-built city for not being monitored point arrangement, user judges whether fidelity factor is up to standard according to the fidelity factor, if judged result is no, control point position is laid.The present invention is evaluated the control point layout in city with fidelity factor, and the scientific and degree of accuracy is higher.
Description
Technical field
The present invention relates to safe city video monitoring field, especially a kind of safe city control point layout based on GIS
Evaluation method.
Background technology
As development like a raging fire throughout the country is built in safe city, social security video monitoring system is played
Effect is more and more important, but the laying for control point position lacks objective guidance standard, often relies on the experience of public security officer
Selected with demand.For whether meeting that actual demand lacks unified objective appraisal index in actual combat, with regard to a certain place
For, if control point position should be installed and do not have authoritative criterion, meanwhile, whether rationally also lacked for monitoring sensor distributing
Weary objective Indentification model.Therefore, it is necessary to set up control point position layout designs appraisement system and method.
At present, different cities are all different to control point layout emphasis, and what some cities proposed is control point quantity
Index, some cities propose is then the index of monitor area coverage rate, while require control point should be distributed in key unit,
Traffic main artery and the multiple location of case, should play a role in social security prevention and control.For scalar type index and covering
Rate index can be examined well, but whether control point has played effect in public security prevention and control and can not then examine, and lacks
Weary good appraisement system.In fact due to fund input deficiency, using the problems such as insufficient is proved, taking the photograph occur in many cities
Un-reasonable phenomenon is designed in camera control point position, causes some monitor area point arrangements excessively intensive and causes to waste, and some
Monitor area does not account for then turning into monitoring blind area.At present, the correlative study and method for point arrangement evaluation are considerably less,
Even if some experts and scholars propose certain methods, subjective assessment is also based on mostly, and scientific and accuracy has much room for improvement.
The content of the invention
Instructed it is an object of the invention to provide a kind of with addressing of the fidelity factor to control point position, to monitoring the side of layouting
The reasonability of case is evaluated, the scientific and higher safe city control point evaluation of layout method based on GIS of the degree of accuracy.
To achieve the above object, present invention employs following technical scheme：A kind of safe city control point cloth based on GIS
Office's evaluation method, the step of this method includes following order：
（1）The geo-spatial data in city is obtained by GIS interface modules；
（2）City for being monitored point arrangement, directly obtain its control point position data；For not being monitored
The newly-built city of point arrangement, first control point position is tentatively laid according to control point position significance level, then obtain its monitoring
Point position data；
（3）Effective overlay area of video camera is calculated according to control point position data, is effectively covered with reference to control point video camera
Region calculates the number of recurrences weights of the control point with road width；
（4）According to road network topology structure and the number of recurrences weight computing fidelity factor of each control point；
（5）The position of control point video camera, direction, effective overlay area, fidelity factor and corresponding are shown in GIS map
Path；
（6）City for being monitored point arrangement, user judge whether fidelity factor is up to standard according to the fidelity factor,
If judged result is no, control point position is carried out perfect；Newly-built city for not being monitored point arrangement, user according to
The fidelity factor judges whether fidelity factor is up to standard, if judged result is no, control point position is laid.
The geo-spatial data in the city includes city road network topological data, key unit's data and corresponding attribute
Data, the corresponding attribute data include have a lot of social connections information, category of roads, key unit's level data.
City for being monitored point arrangement, acquired control point position data include the longitude and latitude of control point position
Degree, video camera set up the angle of pitch, azimuth, focal length and video camera model；City for not being monitored point arrangement, first
Using the main node of road network, key unit and important public place as preliminary control point position, then the warp to preliminary control point position
Latitude, the video camera erection angle of pitch, azimuth, focal length, video camera model are acquired, and using the information of collection as control point
Position data.
Effective overlay area of road difference direction of traffic is separately judged, for the direction of traffic in a direction,
Effective overlay area of video camera refers to the perspective plane of coverage upright projection on the direction of traffic road surface of video camera
Region, obtain projecting to the projection width w on road surface, calculate projection width w and the direction of traffic and have a lot of social connections W ratio, i.e. w/
W, if the ratio is more than or equal to 1, target is 1 by the number of recurrences weights of the control point position；If the ratio is less than 1,
The number of recurrences weights of the control point position are then used as using the ratio.
The calculating of the fidelity factor includes the calculating of specified path fidelity factor, i.e., according to the path specified in GIS map,
The number of recurrences weights of all control point positions of process are summed, draw the fidelity factor in the path.
The calculating of the fidelity factor includes fidelity factor between any two points and calculated, i.e., selected in GIS map starting point and
Terminal, using intersection in road network topology as node, it is wired that the institute of starting point to terminal is calculated according to Dijkstra's algorithm
The fidelity factor on road and its path, take fidelity factor of the minimum value as the point-to-point transmission, and the fidelity factor is the institute in its respective path
There is the number of recurrences weights sum of control point position.
The fidelity factor that the calculating of the fidelity factor includes being arbitrarily designated in region calculates, i.e., is arbitrarily determined in GIS map
It is some starting point, delimit the region for including starting point, using intersection in road network topology as node in designated area, root
Ask for, from starting point to the fidelity factor of region all outlet ports and path, taking minimum value as the region according to Dijkstra's algorithm
Fidelity factor.
After fidelity factor is obtained, effect displaying is carried out by GIS map, calculated according to the control point position data of acquisition
Effective overlay area of video camera, effect is carried out to the position of each video camera, direction, effective overlay area in GIS map
Displaying, and show fidelity factor statistical result.
While fidelity factor is obtained, the orientation and selected direction laid according to control point video camera, count respectively just
The number for the target that face, side, the back side capture.
As shown from the above technical solution, for being monitored the city of point arrangement, the present invention obtains control point first
Position data, calculate the number of recurrences weights of each control point, then calculate fidelity factor and shown in GIS map, user according to
The fidelity factor monitors the reasonability of sensor distributing to evaluate；Newly-built city for not being monitored point arrangement, the present invention
First control point position is tentatively laid according to control point position significance level, control point position data is obtained, calculates each control point
Number of recurrences weights, then calculate fidelity factor and shown in GIS map, according to choosing of the fidelity factor to the control point position of user
Instructed location.It can be seen that the present invention is evaluated the control point layout in city with fidelity factor, the scientific and degree of accuracy is higher.
Brief description of the drawings
Fig. 1 is the control point evaluation of layout method flow diagram that the present invention is directed to the city for being monitored point arrangement.
Fig. 2 is the control point evaluation of layout method flow that the present invention is directed to the newly-built city for not being monitored point arrangement
Figure.
Fig. 3 is to ask for number of recurrences weights schematic diagram in the present invention.
Fig. 4 is the flow chart that designated area fidelity factor is calculated in the present invention.
Fig. 5 is the fidelity factor effect displaying figure based on GIS in the present invention.
Embodiment
As shown in Figure 1, 2, a kind of safe city control point evaluation of layout method based on GIS, including：（1）Connect by GIS
Mouth mold block obtains the geo-spatial data in city；（2）City for being monitored point arrangement, directly obtains its control point
Position data；Newly-built city for not being monitored point arrangement, first control point position is carried out according to control point position significance level
It is preliminary to lay, then obtain its control point position data；（3）Effective overlay area of video camera, knot are calculated according to control point position data
Close the number of recurrences weights that video camera effective overlay area in control point calculates the control point with road width；（4）Opened up according to road network
Flutter the number of recurrences weight computing fidelity factor of structure and each control point；（5）The position of control point video camera is shown in GIS map
Put, direction, effective overlay area, fidelity factor and corresponding path；（6）City for being monitored point arrangement, user
Judge whether fidelity factor is up to standard according to the fidelity factor, if judged result is no, control point position is carried out perfect；For not entering
The newly-built city of row monitoring point arrangement, user judges whether fidelity factor is up to standard according to the fidelity factor, if judged result is no,
Then control point position is laid.Passing Criteria should be differed by user's subjective judgement, different regions and scene Passing Criteria
Cause, for example case region occurred frequently is different from the standard of meagrely-populated location fidelity factor.
As shown in Figure 1, 2, the geo-spatial data in the city include city road network topological data, key unit's data with
And corresponding attribute data, the corresponding attribute data include have a lot of social connections information, category of roads, key unit's level data.It is right
In the city for being monitored point arrangement, acquired control point position data include longitude and latitude, the camera pedestal of control point position
If the angle of pitch, azimuth, focal length and video camera model；City for not being monitored point arrangement, it is first that road network is main
Node, key unit and important public place as preliminary control point position, then longitude and latitude, video camera to preliminary control point position
The erection angle of pitch, azimuth, focal length, video camera model are acquired, and using the information of collection as control point position data.
As shown in figure 3, effective overlay area of road difference direction of traffic is separately judged, such as East and West direction road
Road, judge respectively from east westerly and from west toward eastern effective overlay area, for the direction of traffic in a direction, video camera has
Effect overlay area refers to the perspective plane region of coverage upright projection on the direction of traffic road surface of video camera, is thrown
Projection width w on shadow to road surface, calculate projection width w and the direction of traffic and have a lot of social connections W ratio, i.e. w/W, if the ratio
More than or equal to 1, then target is 1 by the number of recurrences weights of the control point position；If the ratio is less than 1, made with the ratio
For the number of recurrences weights of the control point position.For example have a lot of social connections for 10 meters, throwing of the effective overlay area of video camera on road is had a lot of social connections
Shadow is 8 meters, then it is 8/10=0.8 that can calculate number of recurrences weights, if effectively projection of the overlay area on road is had a lot of social connections
More than or equal to having a lot of social connections, number of recurrences weights are 1.By the purpose that the effective overlay area of video camera is projected be it is convenient with have a lot of social connections into
Row compares.
As shown in figure 3, the calculating on number of recurrences weights, illustrated in figure with tetra- effective cross-sections of A, B, C, D：
Projection w1 of the effective overlay area of A point video cameras on section and the W1 that has a lot of social connections ratio are more than 1, then the reproduction of A points
Number weights are 1；
B points are that two video cameras monitor direction road jointly, remove the video camera of monitor area two of repetition on section
Projection w2 and w3's and be more than 1 with the W2 that has a lot of social connections ratio, then B point number of recurrences weights are 1；
Projection w4 of the video camera overlay area of C points two on section and w5's and it is less than 1 with the ratio for the W3 that has a lot of social connections for 0.8,
Then the number of recurrences weights of C points are 0.8；
Projection w6 of the two video camera overlay areas of D points on section and w7's and be 1 with the W4 that has a lot of social connections ratio, then D points
Number of recurrences weights be 1.
Obtain on road network topology after the number of recurrences weights of each control point position, following three class can be counted according to demand and reappeared
Rate：
The calculating of the fidelity factor includes the calculating of specified path fidelity factor, i.e., according to the path specified in GIS map,
The number of recurrences weights of all control point positions of process are summed, draw the fidelity factor in the path.
The calculating of the fidelity factor includes fidelity factor between any two points and calculated, i.e., selected in GIS map starting point and
Terminal, using intersection in road network topology as node, it is wired that the institute of starting point to terminal is calculated according to Dijkstra's algorithm
The fidelity factor on road and its path, take fidelity factor of the minimum value as the point-to-point transmission, and the fidelity factor is the institute in its respective path
There is the number of recurrences weights sum of control point position.
The fidelity factor that the calculating of the fidelity factor includes being arbitrarily designated in region calculates, i.e., is arbitrarily determined in GIS map
It is some starting point, delimit the region for including starting point, using intersection in road network topology as node in designated area, root
Ask for, from starting point to the fidelity factor of region all outlet ports and path, taking minimum value as the region according to Dijkstra's algorithm
Fidelity factor.
While fidelity factor is obtained, the orientation and selected direction laid according to control point video camera, count respectively just
The number for the target that face, side, the back side capture.
After fidelity factor is obtained, effect displaying is carried out by GIS map, calculated according to the control point position data of acquisition
Effective overlay area of video camera, effect is carried out to the position of each video camera, direction, effective overlay area in GIS map
Displaying, and show fidelity factor statistical result.
As shown in figure 4, the step of calculating designated area fidelity factor is as follows：
Step 1, arbitrarily one node A of selection, specifies the region for including A nodes on map, chooses node A as meter
The starting point of fidelity factor is calculated, for calculating the fidelity factor of designated area；
Step 2, obtain the Bi with one voice of zone boundary and road network topology（B1, B2, B3 ...), the selection area in step 1
Interior acquisition road network information, mainly road network topology structure and intersection are as node, the intersection of zone boundary and road network
Bi（i=1,2,3…）As outlet；
Step 3, A are starting point, and Bi is terminal, node A will be selected in step 1 as the starting point for calculating fidelity factor, gone out
Mouth Bi is as the terminal for calculating fidelity factor；
Step 4, using node number of recurrences weights as weight, the minimum path of fidelity factor is calculated, is begun stepping through from starting point A
All nodes in region, number of recurrences weights sum is minimal path using Dijkstra's algorithm as weights using between two nodes
Footpath algorithm calculates the minimum path of front number of recurrences and minimum number of recurrences from A to all outlet ports node；
Step 5, obtains region fidelity factor, the fidelity factor using minimum number of recurrences as the region, and respective path is
Minimum reproduction path.
As shown in figure 5, using node A as starting point, the minimum path of fidelity factor is A->B->C->D->E->F, A, B, C,
D, the weights of E each points are according to the cloth set direction of video camera and specified path direction as shown in figure 5, counted, as a result for from
Node A to node F, fidelity factor 5.8, wherein, it is positive 1 time（F points）, reverse 4.8 times（A, B, C, D, E point）.The forward direction is
Criticize the number of face capture suspected target, reversely refer to the number of side and back side capture suspected target.
In summary, for being monitored the city of point arrangement, the present invention obtains control point position data first, calculates
Go out the number of recurrences weights of each control point, then calculate fidelity factor and shown in GIS map, user according to the fidelity factor come
The reasonability of evaluation monitoring sensor distributing；Newly-built city for not being monitored point arrangement, the present invention is first according to control point
Position significance level is tentatively laid to control point position, obtains control point position data, calculates the number of recurrences power of each control point
Value, then calculate fidelity factor and shown in GIS map, instructed according to addressing of the fidelity factor to the control point position of user.
Claims (8)
1. a kind of safe city control point evaluation of layout method based on GIS, the step of this method includes following order：
（1）The geo-spatial data in city is obtained by GIS interface modules；
（2）City for being monitored point arrangement, directly obtain its control point position data；For not being monitored a position
The newly-built city laid, first control point position is tentatively laid according to control point position significance level, then obtain its control point position
Data；
（3）Effective overlay area of video camera is calculated according to control point position data, with reference to the effective overlay area of control point video camera
The number of recurrences weights of the control point are calculated with road width；
（4）According to road network topology structure and the number of recurrences weight computing fidelity factor of each control point；
（5）Position, direction, effective overlay area, fidelity factor and the corresponding road of control point video camera are shown in GIS map
Footpath；
（6）City for being monitored point arrangement, user judges whether fidelity factor is up to standard according to the fidelity factor, if sentencing
Disconnected result is no, then control point position is carried out perfect；Newly-built city for not being monitored point arrangement, user is according to described
Fidelity factor judges whether fidelity factor is up to standard, if judged result is no, control point position is laid；
The calculating of the fidelity factor includes the calculating of specified path fidelity factor, i.e., according to the path specified in GIS map, to warp
The number of recurrences weights for all control point positions crossed are summed, and draw the fidelity factor in the path.
2. the safe city control point evaluation of layout method according to claim 1 based on GIS, it is characterised in that：It is described
The geo-spatial data in city includes city road network topological data, key unit's data and corresponding attribute data, described right
The attribute data answered includes have a lot of social connections information, category of roads, key unit's level data.
3. the safe city control point evaluation of layout method according to claim 1 based on GIS, it is characterised in that：For
The city of point arrangement is monitored, acquired control point position data include the longitude and latitude of control point position, video camera is set up
The angle of pitch, azimuth, focal length and video camera model；City for not being monitored point arrangement, main first by road network
Node, key unit and important public place are as preliminary control point position, then longitude and latitude, camera pedestal to preliminary control point position
If the angle of pitch, azimuth, focal length, video camera model are acquired, and using the information of collection as control point position data.
4. the safe city control point evaluation of layout method according to claim 1 based on GIS, it is characterised in that：To road
Effective overlay area of road difference direction of traffic is separately judged, for the direction of traffic in a direction, video camera it is effective
Overlay area refers to the perspective plane region of coverage upright projection on the direction of traffic road surface of video camera, is projected
Projection width w on to road surface, calculate projection width w and the direction of traffic and have a lot of social connections W ratio, i.e. w/W, if the ratio is big
In equal to 1, then target is 1 by the number of recurrences weights of the control point position；If the ratio be less than 1, using the ratio as
The number of recurrences weights of the control point position.
5. the safe city control point evaluation of layout method according to claim 1 based on GIS, it is characterised in that：It is described
The fidelity factor that the calculating of fidelity factor is included between any two points is calculated, i.e., starting point and terminal are selected in GIS map, is opened up with road network
It is node to flutter middle intersection, according to Dijkstra's algorithm calculate starting point all circuits to terminal fidelity factor and its
Path, takes fidelity factor of the minimum value as the point-to-point transmission, and the fidelity factor is the weight of all control point positions in its respective path
Occurrence number weights sum.
6. the safe city control point evaluation of layout method according to claim 1 based on GIS, it is characterised in that：It is described
The fidelity factor that the calculating of fidelity factor includes being arbitrarily designated in region calculates, i.e., it is some starting point to be arbitrarily determined in GIS map,
The region for including starting point delimited, using intersection in road network topology as node in designated area, according to Di Jiesitela
Algorithm is asked for, from starting point to the fidelity factor of region all outlet ports and path, taking fidelity factor of the minimum value as the region.
7. the safe city control point evaluation of layout method according to claim 1 based on GIS, it is characterised in that：Asking
Go out after fidelity factor, effect displaying is carried out by GIS map, the effective of video camera is calculated according to the control point position data of acquisition
Overlay area, effect displaying is carried out to the position of each video camera, direction, effective overlay area in GIS map, and show weight
Now rate statistical result.
8. the safe city control point evaluation of layout method based on GIS according to claim 1 or 5 or 6, its feature exist
In：While fidelity factor is obtained, the orientation and selected direction laid according to control point video camera, front, side are counted respectively
The number for the target that face, the back side capture.
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