CN114222249B - Electronic fence monitoring method and system based on geographic position - Google Patents
Electronic fence monitoring method and system based on geographic position Download PDFInfo
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Abstract
The invention relates to a method and a system for monitoring an electronic fence based on a geographic position, belongs to the technical field of monitoring, and solves the problems of range solidification and low calculation efficiency of the conventional electronic fence. Acquiring an electronic fence area and an electronic fence type corresponding to each managed person based on a map; based on the splitting condition, splitting each electronic fence area step by step, and adding all sub-areas which do not accord with the splitting condition into a subset of the electronic fence areas; otherwise the subset is empty; acquiring a person to be monitored and a geographical position to be monitored based on the geographical position of the controlled person; acquiring a plurality of electronic fence areas to be monitored, a subset of the electronic fence areas and the type of the electronic fence to be monitored; and acquiring a minimum area set corresponding to the geographical position to be monitored, identifying the position relation between the geographical position to be monitored and each minimum area, and combining the corresponding type of the electronic fence to be monitored to obtain the monitoring result of the personnel to be monitored. The bidirectional monitoring of the virtual irregular electronic fence is realized.
Description
Technical Field
The invention relates to the technical field of monitoring, in particular to a method and a system for monitoring an electronic fence based on a geographic position.
Background
In life, the policemen often need to monitor specific key groups to a certain extent, and can not limit daily freedom of the specific key groups, and when a monitored object enters a key focus place or leaves a daily activity range, the policemen need to receive feedback and notice in time so as to process and investigate in time.
Generally, an enclosure, a fence and the like are built, an electronic fence host is installed, sensing equipment is installed along the enclosure, the fence and the like, an alarm signal is transmitted to a control keyboard of a rear-end control center through signal transmission equipment, the working state of a defense area is displayed, and operations such as defense arrangement and withdrawal control are remotely performed on an external pulse host, or an electronic fence monitoring method is realized based on a ray method.
However, the existing scheme of building enclosing walls and fences is not easy to deploy, and once the scheme is built, the scheme is difficult to change again, the electronic fence based on the ray method is only suitable for a small range, when the electronic fence needs to act on a large range, such as provinces, cities and other areas, the end points of the electronic fence forming a closed fence are often hundreds of thousands, and the ray method is directly used at the moment, so that the calculation performance is obviously reduced, and the result is inaccurate.
Disclosure of Invention
In view of the foregoing analysis, embodiments of the present invention are directed to a method and a system for monitoring an electronic fence based on a geographic location, so as to solve the problems of range hardening and low computational efficiency of the existing electronic fence.
In one aspect, an embodiment of the present invention provides a method for monitoring an electronic fence based on a geographic location, including the following steps:
acquiring an electronic fence area and an electronic fence type corresponding to each managed person based on a map; wherein the electronic fence area is an irregular polygonal area;
on the basis of splitting conditions, splitting each electronic fence area step by step until all sub-areas obtained by splitting do not accord with the splitting conditions, and adding all sub-areas which do not accord with the splitting conditions into the subset of the electronic fence areas; otherwise, a subset of the fence areas are combined to be empty;
acquiring a person to be monitored and a geographical position to be monitored based on the geographical position of the controlled person; acquiring a plurality of electronic fence areas to be monitored and a subset thereof corresponding to the personnel to be monitored, and types of the electronic fences to be monitored;
comparing the geographic position to be monitored with each electronic fence area to be monitored and the subset thereof to obtain a minimum area set corresponding to the geographic position to be monitored, identifying the position relationship between the geographic position to be monitored and each minimum area in the minimum area set, and combining the corresponding type of the electronic fence to be monitored to obtain the monitoring result of the personnel to be monitored.
Based on a further improvement of the above method, the electronic fence type comprises: entry and exit are prohibited; the resolution conditions are as follows: the number of vertices of the polygonal area is greater than a threshold; each electronic fence area is split step by step until sub-areas obtained by splitting do not accord with splitting conditions, and the method comprises the following steps:
calculating the central point of each electronic fence area according to the top point of each electronic fence area;
establishing a coordinate system by taking each central point as an origin in sequence, splitting the corresponding electronic fence area into four sub-areas, and recording information of the four sub-areas;
and respectively carrying out iteration step-by-step splitting on the sub-regions which meet the splitting condition in the four sub-regions until the split sub-regions do not meet the splitting condition.
Based on the further improvement of the method, the sub-region information comprises: the method comprises the following steps of (1) encoding a subregion, encoding the region to which the subregion belongs, a region serial number, a splitting level and coordinates of vertexes of the subregion;
the sub-region encoding is: a unique code;
the region to which the region belongs is encoded as follows: region coding corresponding to the split region;
the sequence number of the region is: respectively corresponding to the sequence numbers of an area at the upper left, the upper right, the lower right and the lower left in a coordinate system;
the disassembly grades are respectively as follows: the splitting level of the current sub-region is increased by 1 on the splitting level of the region to which the current sub-region belongs;
each vertex coordinate of the sub-region comprises: the coordinate system comprises an origin coordinate, a vertex coordinate belonging to the current area in the electronic fence area, and an intersection point coordinate generated by respectively intersecting the X axis and the Y axis of the coordinate system with the boundary of the electronic fence area.
Based on the further improvement of the method, the method for calculating the coordinates of the intersection points comprises the following steps:
sequentially comparing each vertex coordinate of the electronic fence area with the origin coordinate to obtain an area sequence number of each vertex;
and sequentially identifying whether the two continuous vertex coordinates have the same region serial number, if not, calculating a linear equation coefficient of the boundary of the region to which the two continuous vertex coordinates belong according to the two vertex coordinates, and obtaining the coordinates of the intersection point according to the origin coordinates, wherein the intersection point is simultaneously used as the intersection point of the regions to which the two continuous vertex coordinates belong.
Based on further improvement of the method, the geographical position of the controlled personnel is obtained by regularly acquiring geographical position coordinates through mobile equipment carried by the controlled personnel, and if the network is normal, the geographical position coordinates are immediately pushed to a monitoring server after acquisition; if the network is abnormal, the network is stored in the mobile equipment, and the network is pushed to the monitoring server after the network is normal.
Based on further improvement of the method, the method for comparing the geographical position to be monitored with each electronic fence area to be monitored and the subset thereof to obtain the minimum area set corresponding to the geographical position to be monitored comprises the following steps:
sequentially taking out each electronic fence area to be monitored and a subset thereof, and adding a minimum area set if the subset of the current electronic fence area to be monitored is empty, wherein the current electronic fence area to be monitored is a minimum area; otherwise, the subset of the current electronic fence area to be monitored is used as the current comparison set to be compared, and the minimum area is further drilled step by step, and the method comprises the following steps:
acquiring origin coordinates and area codes corresponding to a plurality of sub-area information with the minimum splitting level according to the splitting levels of all the sub-area information in the current set to be compared, and respectively using the origin coordinates and the area codes as the origin coordinates to be compared and the area codes to be compared;
comparing the geographical position to be monitored with the origin coordinate to be compared to obtain a region serial number to which the geographical position to be monitored belongs, and taking the region serial number as a first serial number;
and for the current set to be compared, the first sequence number is used as a region sequence number, the region code to be compared is used as a region code to be compared and is inquired, if a plurality of pieces of sub-region information meeting the conditions are inquired, the plurality of pieces of sub-region information meeting the conditions are used as a new current set to be compared to iterate until one piece of sub-region information meeting the conditions is inquired and is used as a minimum region in the current set to be compared, and the minimum region set is added.
Based on further improvement of the method, the method includes the steps of identifying the position relation between the geographic position to be monitored and each minimum area in the minimum area set, and obtaining the monitoring result of the personnel to be monitored by combining the corresponding type of the electronic fence to be monitored, and the method includes the following steps:
according to the ray method, calculating the position relation between the geographic position to be monitored and each minimum region in the minimum region set, wherein the position relation comprises the following steps: within a region or outside a region;
identifying each position relation, and judging whether the position relation is matched with the type of the corresponding electronic fence to be monitored, if not, recording early warning information; the early warning information includes: acquiring time of the geographic position of the controlled person, the geographic position coordinate of the controlled person and the corresponding electronic fence type;
if any early warning information exists, the monitoring result is abnormal, otherwise, the monitoring result is normal;
the position relation is not matched with the corresponding type of the electronic fence to be monitored, and the method comprises the following steps:
when the position relation is outside the area, but the corresponding type of the electronic fence to be monitored is forbidden to leave; and the number of the first and second groups,
when the position relationship is in the area, but the corresponding electronic fence type to be monitored is prohibited from entering.
Based on a further improvement of the above method, calculating a center point of each of the fence regions according to the vertex of each of the fence regions, includes:
according to the top point of the electronic fence area, the electronic fence area is divided into a plurality of triangles, and the top point coordinate of each triangle is recorded;
calculating the latitude and longitude of the gravity center of each triangle and the area of the triangle according to the vertex coordinates of each triangle;
dividing the sum of the products of the latitudes of the gravity centers of the triangles and the areas of the triangles by the sum of the areas of the triangles to obtain the latitude of the central point;
dividing the sum of the products of the longitudes of the centers of gravity of the triangles and the areas of the triangles by the sum of the areas of the triangles to obtain the longitude of the central point;
the latitude of the center point and the longitude of the center point are combined into the center point coordinate.
In another aspect, an embodiment of the present invention provides a system for monitoring an electronic fence based on a geographic location, including:
the data acquisition module is used for acquiring the geographical position of the controlled personnel at regular time and carrying out pretreatment;
the electronic fence generating module is used for acquiring each electronic fence area and electronic fence type of each managed and controlled person based on a map, wherein the electronic fence area is an irregular polygonal area; based on the splitting condition, splitting each electronic fence area step by step until all sub-areas obtained by splitting do not accord with the splitting condition, and adding all sub-areas which do not accord with the splitting condition into a sub-set of the electronic fence area; otherwise, the subset of the electronic fence area is empty;
the data monitoring module is used for acquiring the personnel to be monitored and the geographical position to be monitored from the data acquisition module; acquiring a plurality of electronic fence areas to be monitored and a subset thereof corresponding to the personnel to be monitored, and the types of the electronic fences to be monitored; comparing the geographic position to be monitored with each electronic fence area to be monitored and the subset thereof to obtain a minimum area set corresponding to the geographic position to be monitored, identifying the position relationship between the geographic position to be monitored and each minimum area in the minimum area set, and combining the corresponding type of the electronic fence to be monitored to obtain the monitoring result of the personnel to be monitored.
Based on the further improvement of above-mentioned system, still include: the early warning notice module is used for identifying whether the monitoring result is abnormal, if the monitoring result is abnormal, the corresponding early warning information is acquired to inform the managed and controlled personnel and the corresponding supervision personnel, and the early warning information comprises: the method comprises the steps of collecting time of the geographic position of a controlled person, the geographic position coordinates of the controlled person and the corresponding electronic fence type.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. hardware equipment does not need to be installed, geographical position coordinates are collected at regular time based on mobile equipment carried by controlled personnel, the method is accurate and timely, bidirectional monitoring that the controlled area is prohibited from entering and leaving is realized at regular time through a virtual electronic fence, the cost is reduced, and the supervision force and the early warning efficiency are improved;
2. based on the map, the drawn area is collected, the method is flexible and convenient, and the position relation is identified after the irregular polygonal area is processed into a plurality of small areas according to the area splitting algorithm, so that the data processing efficiency is improved, and the performance loss of the server is reduced.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a flowchart of a method for monitoring an electronic fence based on a geographic location according to embodiment 1 of the present invention;
fig. 2 is a schematic view illustrating a progressive splitting of an electronic fence in embodiment 1 of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The method is used for assisting a supervision unit to manage and control key managed personnel. The mobile devices carried by the managed personnel, such as mobile phones and bracelets, collect geographical location information at regular time and push the geographical location information to the monitoring server, and when the managed personnel leave the general activity range (such as city crossing, provincial crossing, and the like) or enter some specific places, the monitoring unit needs to master the information of the managed personnel at the first time so as to take corresponding measures to process and investigate.
It should be noted that the general range of motion and certain specific locations are virtual electronic fence areas, each mobile device corresponds to a managed person, each managed person may have a plurality of electronic fence areas, and each electronic fence area corresponds to an electronic fence type for defining whether the electronic fence is prohibited from entering or leaving.
In the case of the example 1, the following examples are given,
one embodiment of the present invention discloses a method for monitoring an electronic fence based on a geographic location, as shown in fig. 1, comprising the following steps:
s11: acquiring a plurality of electronic fence areas and electronic fence types corresponding to each managed person based on a map; the electronic fence area is an irregular polygonal area;
it should be noted that, an electronic fence area is drawn on a map in a manner of drawing a closed polygon, each vertex of the polygon corresponds to a real geographic position coordinate, and the geographic position coordinate is obtained according to a map interface and is marked as P (lat, long); wherein lat represents latitude, and lng represents longitude, then according to clockwise or counterclockwise, n vertex coordinates of the polygon are combined into a complete electronic fence area information, which is marked as { (lat) 1 ,lng 1 ),(lat 2 ,lng 2 ),...,(lat n ,lng n )}。
For each drawn electronic fence area, appointing a managed person, and configuring the electronic fence type, wherein the steps comprise: entry prohibited and exit prohibited. The bidirectional monitoring that the control area is forbidden to enter and leave is realized through the virtual electronic fence, the cost is reduced, and the supervision and early warning efficiency are improved.
Preferably, a plurality of electronic fence areas are respectively drawn for different managed personnel.
After the drawing is completed, a plurality of electronic fence areas and electronic fence types of each controlled person are obtained, codes of the controlled persons, electronic fence area information and electronic fence types are stored in an electronic fence information table, a unique area code is generated, meanwhile, whether the electronic fence areas need to be split or not is identified, and step S12 is executed.
S12: based on the splitting condition, splitting each electronic fence area step by step until all sub-areas obtained by splitting do not accord with the splitting condition, and adding all sub-areas which do not accord with the splitting condition into a sub-set of the electronic fence area; otherwise, the subset of the electronic fence area is empty;
it should be noted that the resolution conditions are: the number of vertices of the polygonal region is greater than a threshold. Illustratively, the threshold is set at 20.
As shown in fig. 2, splitting each electronic fence area step by step until all sub-areas obtained by splitting do not meet the splitting condition, including:
1) calculating the central point of each electronic fence area according to the peak of each electronic fence area; specifically, the method comprises the following steps:
splitting an electronic fence area into a plurality of triangles according to the vertexes of the electronic fence area, and recording the vertex coordinates of each triangle;
it should be noted that, there are various methods to split the fence area into a plurality of triangles according to the vertices of the fence area, such as: the electronic fence area is provided with n vertexes, a left diagonal line and a right diagonal line are made from any vertex, and the electronic fence area can be divided into n-2 triangles; or, randomly finding a point in the electronic fence area, connecting with each vertex, and dividing into n triangles; or any non-vertex point is taken from the boundary of the electronic fence area, is connected with each vertex, and can be divided into n-1 triangles.
Preferably, the first mode is adopted to minimize the number of split triangles and reduce the amount of calculation.
After splitting into a plurality of triangles, recording the vertex coordinates of each triangle, and recording the vertex coordinates as { (w) m1 ,j m1 ),(w m2 ,j m2 ),(w m3 ,j m3 ) Wherein (w) m1 ,j m1 ) Denotes the 1 st vertex coordinate, w, in the m-th triangle m1 Represents latitude, j m1 Represents longitude; 1,2, n-2.
Secondly, calculating each triangle by adopting a formula (1) according to the vertex coordinates of each triangleLatitude W of the center of gravity mc And longitude J mc Calculating the area S of each triangle by using the formula (2) m ；
Thirdly, dividing the sum of the products of the latitudes of the gravity centers of the triangles and the areas of the triangles by the sum of the areas of the triangles by adopting a formula (3) to obtain the latitude C of the central point w (ii) a Dividing the sum of the products of the longitudes of the centers of gravity of the triangles and the area of the triangles by the sum of the areas of the triangles to obtain the longitude C of the center point j ；
Fourthly, the latitude of the central point and the longitude of the central point form a central point coordinate (C) w ,C j )。
2) Establishing a coordinate system by taking each central point as an origin in sequence, splitting the corresponding electronic fence area into four sub-areas, and recording information of the four sub-areas;
when the coordinate system is established, there is no limitation on whether latitude or longitude is selected as the X axis, as long as the latitude and longitude are consistent in the calculation step.
Longitude as X axis, latitude as Y axis, and center point coordinate (C) w ,C j ) As the origin coordinates, the upper left area range is: longitude less than C w Latitude greater than C j (ii) a The upper right region ranges are: longitude greater than C w Latitude greater than C j (ii) a The lower right area ranges are: longitude greater than C w Latitude less than C j (ii) a The lower left area ranges are: longitude less than C w Latitude less than C j 。
For the four sub-regions obtained by splitting, recording sub-region information, including: the method comprises the following steps of (1) encoding a subregion, encoding the region to which the subregion belongs, a region serial number, a splitting level and coordinates of vertexes of the subregion;
the sub-region encoding is: a unique code;
the region to which the region belongs is encoded as follows: the region code corresponding to the split region is used for recording a parent region to which the sub region belongs;
the sequence number of the region is: respectively corresponding to the sequence numbers of an area at the upper left, the upper right, the lower right and the lower left in a coordinate system; illustratively, top left, top right, bottom right, and bottom left are denoted by 1,2, 3, and 4, respectively.
The disassembly grades are respectively as follows: the splitting level of the current sub-region is increased by 1 on the splitting level of the region to which the current sub-region belongs; the smaller the split level, the larger the sub-region.
Each vertex coordinate of the sub-region comprises: the coordinate system comprises an origin coordinate, a vertex coordinate belonging to the current area in the electronic fence area, and an intersection point coordinate generated by respectively intersecting the X axis and the Y axis of the coordinate system with the boundary of the electronic fence area.
The method for calculating the coordinates of the intersection points comprises the following steps:
comparing coordinates of each vertex of the electronic fence area with coordinates of an origin in sequence to obtain an area sequence number of each vertex;
specifically, the longitude and latitude of each vertex coordinate are respectively compared with the longitude and latitude of the origin coordinate, and the region corresponding to each vertex can be obtained according to the range of the four regions, that is, the corresponding region number is obtained.
And secondly, sequentially identifying whether two continuous vertex coordinates have the same region serial number, if not, calculating a linear equation coefficient of the region boundary to which the two continuous vertex coordinates belong according to the two vertex coordinates, and obtaining a coordinate of an intersection point according to the origin coordinate, wherein the intersection point is simultaneously used as the intersection point of the region to which the two continuous vertex coordinates belong.
Specifically, a straight line is determined by two continuous vertexes, and the coordinates of the two vertexes are substituted into the straight line equation according to the straight line equation y being ax + b, so that the coefficients a and b of the straight line equation can be obtained, and the intersection point is the same as the latitude or longitude of the origin coordinate, so that the intersection point coordinate can be obtained according to the origin coordinate.
3) And respectively carrying out iteration step-by-step splitting on the sub-regions which meet the splitting condition in the four sub-regions until the split sub-regions do not meet the splitting condition.
It should be noted that, the number of vertices of the sub-region is obtained according to the coordinates of the vertices of the sub-region, and if the splitting condition is met, the step 1) is returned, and the sub-region is taken as the electronic fence region in the step 1) to be split again until the split sub-region does not meet the splitting condition.
And adding all the sub-areas which do not meet the splitting condition into the subset of the electronic fence area. By the steps, after the irregular polygonal area is processed into a plurality of small areas, a foundation is laid for identification of subsequent position relations, improvement of data processing efficiency is facilitated, and performance loss of the server is reduced.
S13: acquiring a person to be monitored and a geographical position to be monitored based on the geographical position of the controlled person; acquiring a plurality of electronic fence areas to be monitored and a subset thereof corresponding to the personnel to be monitored, and the types of the electronic fences to be monitored;
it should be noted that the geographic position of the controlled person is obtained by regularly acquiring the geographic position coordinates through the mobile device carried by the controlled person, and if the network is normal, the geographic position coordinates are immediately pushed to the monitoring server after being acquired; if the network is abnormal, the network is stored in the mobile equipment, and the network is pushed to the monitoring server after the network is normal.
The pushing data comprises the following steps: collecting time, codes of managed and controlled personnel bound by the mobile equipment and geographical position information. And after receiving the pushed data, the monitoring server merges the data with continuous time but unchanged geographic position information, and takes the earliest acquisition time as the merged acquisition time. The preprocessing mode reduces unnecessary data volume and improves calculation efficiency.
And when the preprocessed pushed data are stored in the personnel geographical position table, setting a processing mark as unprocessed. And when the managed personnel are monitored regularly, selecting the record with the processing mark as unprocessed from the personnel geographical position table as the personnel to be monitored and the geographical position to be monitored, and updating the processing mark as processing. And acquiring a plurality of corresponding electronic fence areas and subsets thereof and electronic fence types from a cache or an electronic fence information table according to the controlled personnel codes of the personnel to be monitored.
Preferably, after the electronic fence area, the subset thereof, and the type of the electronic fence are acquired for the first time, the information is set in the cache, so that the information is conveniently acquired from the cache, the query efficiency is improved, when the electronic fence area is adjusted, the existing information in the cache is cleared according to the area code, and when the electronic fence area is acquired for the first time, the latest information is set in the cache again.
S14: comparing the geographic position to be monitored with each electronic fence area and the subset thereof to obtain a minimum area set corresponding to the geographic position to be monitored, identifying the position relation between the geographic position to be monitored and each minimum area in the minimum area set, and combining the corresponding type of the electronic fence to be monitored to obtain the monitoring result of the personnel to be monitored.
Specifically, comparing the geographic position to be monitored with each electronic fence area to be monitored and the subset thereof to obtain the minimum area set corresponding to the geographic position to be monitored, the method includes:
sequentially taking out each electronic fence area to be monitored and a subset thereof, and adding a minimum area set if the subset of the current electronic fence area to be monitored is empty, wherein the current electronic fence area to be monitored is a minimum area; otherwise, the subset of the current electronic fence area to be monitored is used as the current comparison set to be compared, and the minimum area is further drilled step by step, and the method comprises the following steps:
according to the splitting levels of all the sub-region information in the current set to be compared, obtaining original point coordinates and region codes corresponding to the sub-region information with the minimum splitting level, and respectively using the original point coordinates and the region codes as the original point coordinates to be compared and the region codes to be compared; comparing the geographical position to be monitored with the origin coordinate to be compared to obtain a region serial number to which the geographical position to be monitored belongs, and taking the region serial number as a first serial number;
and for the current set to be compared, the first sequence number is used as a region sequence number, the region code to be compared is used as a region code to be compared and is inquired, if a plurality of pieces of sub-region information meeting the conditions are inquired, the plurality of pieces of sub-region information meeting the conditions are used as a new current set to be compared to iterate until one piece of sub-region information meeting the conditions is inquired and is used as a minimum region in the current set to be compared, and the minimum region set is added.
After the minimum area set is obtained, identifying the position relation between the geographical position to be monitored and each minimum area in the minimum area set, and obtaining the monitoring result of the personnel to be monitored by combining the corresponding electronic fence type, wherein the monitoring result comprises the following steps:
according to the ray method, calculating the position relation between the geographic position to be monitored and each minimum region in the minimum region set, wherein the position relation comprises the following steps: within a region or outside a region;
specifically, the data model formula of the ray method is as follows:
in connection with the present embodiment, when longitude is taken as the X-axis and latitude is taken as the Y-axis, Y in the formula (4) 0 For the latitude, x, of the geographical location to be monitored 1 ，x 2 Longitude, y, of two consecutive vertices of a minimum area 1 ，y 2 Is equal to x 1 ，x 2 The latitude of the corresponding consecutive two vertices.
According to the formula (4), carrying out iteration judgment on every two continuous vertexes of each minimum area, and in each iteration, calculating the obtained longitude x and the longitude x of the geographic position to be monitored 0 And (3) carrying out comparison:
if x and x 0 The absolute value of the difference value of (1) is within a preset error range, and the geographical position to be monitored is on a boundary formed by two continuous vertexes, and the position relationship is iteration of exiting from a current minimum region in the region;
if x is greater than x 0 It means that the ray from the geographical position to be monitored intersects with the edge formed by two continuous vertexes, the counting value is increased by 1, and then two continuous vertexes are taken to continue to overlapGeneration until x and x 0 The absolute value of the difference value of (1) is within a preset error range, or after traversing all continuous two vertexes of the minimum region, the final count value is an odd number, the position relationship is in the region, otherwise, the position relationship is out of the region.
The method comprises the steps of splitting an original electronic fence area step by step to obtain small areas in different area ranges, determining an area to which the original electronic fence area belongs step by step according to comparison between a geographic position to be monitored and the center of the original electronic fence area, drilling the area to which the original electronic fence area belongs step by step to obtain a minimum area corresponding to the geographic position to be monitored, and comparing the geographic position to be monitored with the minimum area to obtain a position relation no matter how large the range and the number of edges of the original electronic fence area are, so that the comparison times are few, the calculation complexity is small, and the efficiency is high.
Because this embodiment has two-way monitoring ability, whether the personnel of being managed and controlled cross the border, need again according to the fence type to confirm.
Specifically, whether each position relation is matched with the corresponding electronic fence type or not is identified, and if not, early warning information is recorded; the early warning information includes: acquiring time of the geographic position of the controlled person, the geographic position coordinate of the controlled person and the corresponding electronic fence type;
if any early warning information exists, the monitoring result is abnormal, otherwise, the monitoring result is normal;
wherein, the position relation not matching with the corresponding electronic fence type comprises:
when the position relation is outside the area, but the corresponding electronic fence type is forbidden to leave; and the number of the first and second groups,
when the location relationship is within the zone, but the corresponding fence type is prohibited from entering.
And after the monitoring result is obtained, updating the processing mark of the corresponding record into processed in the personnel geographic position table.
Preferably, when the monitoring result is identified to be abnormal, the early warning information is acquired to notify the managed and controlled personnel and the corresponding supervisory personnel, and the early warning message includes: the method comprises the steps of collecting time of the geographic position of a controlled person, the geographic position coordinates of the controlled person and the corresponding electronic fence type.
Compared with the prior art, the electronic fence monitoring method based on the geographic position, provided by the embodiment, can be used for regularly acquiring the coordinates of the geographic position based on the mobile equipment carried by the controlled personnel, accurately and timely, realizing bidirectional monitoring of forbidding entering and forbidding leaving of the controlled area through the virtual electronic fence at regular time, reducing the cost and improving the supervision and early warning efficiency; based on the map, the drawn area is collected, the method is flexible and convenient, and the position relation is identified after the irregular polygonal area is processed into a plurality of small areas according to the area splitting algorithm, so that the data processing efficiency is improved, and the performance loss of the server is reduced.
In the case of the example 2, the following examples are given,
in another embodiment of the present invention, an electronic fence monitoring system based on a geographic location is disclosed, so as to implement the electronic fence monitoring method in embodiment 1. The specific implementation of each module refers to the corresponding description in embodiment 1, and includes:
the data acquisition module is used for acquiring the geographical position of the controlled personnel at regular time and carrying out pretreatment;
the electronic fence generating module is used for acquiring each electronic fence area and electronic fence type of each managed and controlled person based on a map, wherein the electronic fence area is an irregular polygonal area; based on the splitting condition, splitting each electronic fence area step by step until all sub-areas obtained by splitting do not accord with the splitting condition, and adding all sub-areas which do not accord with the splitting condition into a sub-set of the electronic fence area; otherwise, the subset of the electronic fence area is empty;
the data monitoring module is used for acquiring the personnel to be monitored and the geographical position to be monitored from the data acquisition module; acquiring a plurality of electronic fence areas to be monitored and a subset thereof corresponding to the personnel to be monitored, and the types of the electronic fences to be monitored; comparing the geographic position to be monitored with each electronic fence area to be monitored and the subset thereof to obtain a minimum area set corresponding to the geographic position to be monitored, identifying the position relationship between the geographic position to be monitored and each minimum area in the minimum area set, and combining the corresponding type of the electronic fence to be monitored to obtain the monitoring result of the personnel to be monitored.
Preferably, the method further comprises the following steps: the early warning notice module is used for identifying whether the monitoring result is abnormal, if the monitoring result is abnormal, the corresponding early warning information is acquired to inform the managed and controlled personnel and the corresponding supervision personnel, and the early warning information comprises: the method comprises the steps of collecting time of the geographic position of a controlled person, the geographic position coordinates of the controlled person and the corresponding electronic fence type.
During implementation, the electronic fence area and the electronic fence type of each controlled person are drawn on line based on a map, the electronic fence area is identified based on the splitting condition while being stored, the electronic fence area is split into a plurality of small areas in four area ranges, a subset is obtained, and monitoring preparation is made.
The monitoring data are derived from the geographical positions which are regularly acquired by the mobile equipment carried by the managed and controlled personnel, preferably, in order to avoid overlarge data volume and different starting times of the regular acquisition, the monitoring server processes the received data in batches, in order to reduce unnecessary data volume, the data which are continuous in time but unchanged in geographical position information are merged, and the earliest acquisition time is taken as the merged acquisition time.
During monitoring, the stored geographic position information is regularly marked through different processing to obtain the managed and controlled personnel to be monitored and the geographic position to be monitored, position relation identification is carried out on the managed and controlled personnel to be monitored and the corresponding electronic fence area and the subset of the electronic fence area, whether border crossing occurs or not is judged according to the type of the electronic fence, and early warning information is generated. And timely informing the managed and controlled personnel and the corresponding monitoring personnel through an early warning informing module.
Compared with the prior art, the electronic fence monitoring system based on the geographic position provided by the embodiment utilizes the virtual fence, directly sets the electronic fence monitoring range in an online visual drawing mode, does not need to build a fence, install a camera and other equipment, and only needs to carry mobile equipment for a monitored object without an additional device; by splitting the electronic fence, the calculation amount is reduced, and the calculation efficiency under the condition of a complex electronic fence is improved.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware, and the program may be stored in a computer-readable storage medium. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (8)
1. A method for monitoring electronic fence based on geographic position is characterized by comprising the following steps:
acquiring an electronic fence area and an electronic fence type corresponding to each managed person based on a map; wherein the electronic fence area is an irregular polygonal area;
on the basis of splitting conditions, splitting each electronic fence area step by step until all sub-areas obtained by splitting do not accord with the splitting conditions, and adding all sub-areas which do not accord with the splitting conditions into the subset of the electronic fence areas; otherwise, a subset of the fence areas are combined to be empty;
acquiring a person to be monitored and a geographical position to be monitored based on the geographical position of the controlled person; acquiring a plurality of electronic fence areas to be monitored and a subset thereof corresponding to the personnel to be monitored, and types of the electronic fences to be monitored;
comparing the geographic position to be monitored with each electronic fence area to be monitored and the subset thereof to obtain a minimum area set corresponding to the geographic position to be monitored, identifying the position relationship between the geographic position to be monitored and each minimum area in the minimum area set, and combining the corresponding type of the electronic fence to be monitored to obtain the monitoring result of the personnel to be monitored;
the resolution conditions are: the number of vertices of the polygonal area is greater than a threshold; each electronic fence area is split step by step until sub-areas obtained by splitting do not accord with splitting conditions, and the method comprises the following steps:
calculating the central point of each electronic fence area according to the vertex of each electronic fence area;
sequentially establishing a coordinate system by taking each central point as an origin, splitting the corresponding electronic fence area into four sub-areas, and recording information of the four sub-areas;
respectively carrying out iteration step-by-step splitting on sub-regions which meet the splitting condition in the four sub-regions until the split sub-regions do not meet the splitting condition;
the method for identifying the position relationship between the geographical position to be monitored and each minimum area in the minimum area set and obtaining the monitoring result of the personnel to be monitored by combining the corresponding type of the electronic fence to be monitored comprises the following steps:
according to the ray method, calculating the position relation between the geographic position to be monitored and each minimum area in the minimum area set, wherein the position relation comprises the following steps: within a region or outside a region;
identifying each position relation, and judging whether the position relation is matched with the type of the corresponding electronic fence to be monitored, if not, recording early warning information; the early warning information includes: acquiring time of the geographic position of the controlled person, the geographic position coordinate of the controlled person and the corresponding electronic fence type;
if any early warning information exists, the monitoring result is abnormal, otherwise, the monitoring result is normal;
the position relation not matched with the corresponding type of the electronic fence to be monitored comprises the following steps:
when the position relation is outside the area, the corresponding electronic fence to be monitored is forbidden to leave; and the number of the first and second groups,
when the position relation is in the area, but the corresponding electronic fence type to be monitored is prohibited from entering.
2. The geo-location based electronic fence monitoring method of claim 1, wherein the sub-area information comprises: the method comprises the following steps of (1) encoding a subregion, encoding the region to which the subregion belongs, a region serial number, a splitting level and coordinates of vertexes of the subregion;
the sub-region encoding is: a unique code;
the region to which the region belongs is encoded by: region coding corresponding to the split region;
the sequence number of the region is: respectively corresponding to the sequence numbers of an area at the upper left, the upper right, the lower right and the lower left in a coordinate system;
the splitting levels are: the splitting level of the current sub-region is increased by 1 on the splitting level of the region to which the current sub-region belongs;
the coordinates of each vertex of the sub-region comprise: the coordinate system comprises the origin coordinate, the vertex coordinate belonging to the current area in the electronic fence area, and the intersection point coordinate generated by the intersection of the X axis and the Y axis of the coordinate system with the boundary of the electronic fence area respectively.
3. The geo-location based fence monitoring method of claim 2, wherein the method of calculating the intersection coordinates comprises:
sequentially comparing each vertex coordinate of the electronic fence area with the origin coordinate to obtain an area sequence number of each vertex;
and sequentially identifying whether two continuous vertex coordinates have the same region serial number, if not, calculating a linear equation coefficient of the boundary of the region to which the two continuous vertex coordinates belong according to the two vertex coordinates, and obtaining a coordinate of an intersection point according to the origin coordinate, wherein the intersection point is simultaneously used as the intersection point of the regions to which the two continuous vertex coordinates belong.
4. The method for monitoring the electronic fence based on the geographic position according to any one of claims 1 to 3, wherein the geographic position of the controlled person is obtained by regularly acquiring a coordinate of the geographic position through a mobile device carried by the controlled person, and if the network is normal, the geographic position is immediately pushed to a monitoring server after the acquisition; if the network is abnormal, the network is stored in the mobile equipment, and the network is pushed to the monitoring server after the network is normal.
5. The method according to claim 1, wherein the comparing the geo-location to be monitored with each of the areas of the electronic fence to be monitored and the subset thereof to obtain the minimum area set corresponding to the geo-location to be monitored comprises:
sequentially taking out each electronic fence area to be monitored and the subset thereof, and adding the minimum area set if the subset of the current electronic fence area to be monitored is empty, wherein the current electronic fence area to be monitored is the minimum area; otherwise, the subset of the current electronic fence area to be monitored is used as the current comparison set to be compared, and the minimum area is further drilled step by step, and the method comprises the following steps:
acquiring origin coordinates and area codes corresponding to a plurality of sub-area information with the minimum splitting level according to the splitting levels of all the sub-area information in the current set to be compared, and respectively using the origin coordinates and the area codes as the origin coordinates to be compared and the area codes to be compared;
comparing the geographical position to be monitored with the origin coordinate to be compared to obtain a region serial number to which the geographical position to be monitored belongs, and taking the region serial number as a first serial number;
and for the current set to be compared, using the first sequence number as a region sequence number, using the region code to be compared as a region code, and inquiring, if a plurality of pieces of sub-region information meeting the conditions are inquired, using the plurality of pieces of sub-region information meeting the conditions as a new current set to be compared to iterate until one piece of sub-region information meeting the conditions is inquired, and adding the minimum region set as a minimum region in the current set to be compared.
6. The method of claim 1, wherein said calculating a center point of each of the electronic fence areas from the vertices of each of the electronic fence areas comprises:
according to the top point of the electronic fence area, splitting the electronic fence area into a plurality of triangles, and recording the top point coordinates of each triangle;
calculating the latitude and longitude of the gravity center of each triangle and the area of the triangle according to the vertex coordinates of each triangle;
dividing the sum of the products of the latitudes of the centers of gravity of the triangles and the areas of the triangles by the sum of the areas of the triangles to obtain the latitude of the central point;
dividing the sum of the products of the longitudes of the centers of gravity of the triangles and the areas of the triangles by the sum of the areas of the triangles to obtain the longitude of the central point;
and forming the latitude of the central point and the longitude of the central point into a central point coordinate.
7. A geo-location based electronic fence monitoring system, comprising:
the data acquisition module is used for acquiring the geographical position of the controlled personnel at regular time and carrying out pretreatment;
the electronic fence generating module is used for acquiring each electronic fence area and electronic fence type of each managed person based on a map, wherein the electronic fence area is an irregular polygonal area; on the basis of splitting conditions, splitting each electronic fence area step by step until all sub-areas obtained by splitting do not accord with the splitting conditions, and adding all sub-areas which do not accord with the splitting conditions into the subset of the electronic fence areas; otherwise, a subset of the fence areas are combined to be empty;
the resolution conditions are: the number of vertices of the polygonal area is greater than a threshold; each electronic fence area is split step by step until sub-areas obtained by splitting do not accord with splitting conditions, and the method comprises the following steps:
calculating the central point of each electronic fence area according to the vertex of each electronic fence area;
sequentially establishing a coordinate system by taking each central point as an origin, splitting the corresponding electronic fence area into four sub-areas, and recording information of the four sub-areas;
respectively carrying out iteration step-by-step splitting on sub-regions which meet the splitting condition in the four sub-regions until the split sub-regions do not meet the splitting condition;
the data monitoring module is used for acquiring the personnel to be monitored and the geographical position to be monitored from the data acquisition module; acquiring a plurality of electronic fence areas to be monitored and a subset thereof corresponding to the personnel to be monitored, and the types of the electronic fences to be monitored; comparing the geographic position to be monitored with each electronic fence area to be monitored and the subset thereof to obtain a minimum area set corresponding to the geographic position to be monitored, identifying the position relationship between the geographic position to be monitored and each minimum area in the minimum area set, and obtaining the monitoring result of the personnel to be monitored by combining the corresponding electronic fence type to be monitored, wherein the monitoring result comprises the following steps:
according to the ray method, calculating the position relation between the geographic position to be monitored and each minimum area in the minimum area set, wherein the position relation comprises the following steps: within a region or outside a region;
identifying each position relation, and judging whether the position relation is matched with the type of the corresponding electronic fence to be monitored, if not, recording early warning information; the early warning information includes: acquiring time of the geographic position of the controlled person, the geographic position coordinate of the controlled person and the corresponding electronic fence type;
if any early warning information exists, the monitoring result is abnormal, otherwise, the monitoring result is normal;
the position relation not matched with the corresponding type of the electronic fence to be monitored comprises the following steps:
when the position relation is outside the area, the corresponding electronic fence to be monitored is forbidden to leave; and the number of the first and second groups,
when the position relationship is in the area, but the corresponding type of the electronic fence to be monitored is forbidden to enter.
8. A geo-location based electronic fence monitoring system as claimed in claim 7, further comprising: the early warning notification module is used for identifying whether the monitoring result is abnormal or not, if the monitoring result is abnormal, the corresponding early warning information is acquired to notify the managed and controlled personnel and the corresponding supervision personnel, and the early warning information comprises: the method comprises the steps of collecting time of the geographic position of a controlled person, the geographic position coordinates of the controlled person and the corresponding electronic fence type.
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