CN111811524A - Big data-based map real-time updating device and method - Google Patents

Abstract

The embodiment of the invention discloses a map real-time updating device based on big data, which comprises an acquisition device for acquiring image information and a mobile terminal for preprocessing the data information and generating secondary map navigation model information, wherein the acquisition device acquires a plurality of sub-data packets in real time when a pedestrian walks according to a navigation map path and guides the sub-data packets into and uploads the sub-data packets to a big data processing module, the big data processing module acquires the image information acquired by the acquisition device and processes and analyzes the data, and then the analyzed data is transmitted to a data storage and processing module. Meanwhile, some areas with fuzzy map representation are fully displayed, and the situations of winding roads and the like are avoided.

Description

Big data-based map real-time updating device and method

Technical Field

The embodiment of the invention relates to the technical field of maps, in particular to a device and a method for updating a map in real time based on big data.

Background

The map is a graph which is drawn and displayed on the surface of the earth by lines, symbols, colors, character notes and the like according to a certain proportion, wherein the map is a large-scale data set and has four characteristics of massive data scale, rapid data circulation, various data types and low value density. With the progress of science and technology, the concept of maps is constantly developed and changed, for example, the maps are regarded as images and symbolic models reflecting natural and social phenomena, the maps are carriers of space information, transmission channels of space information and the like, ancient maps are generally drawn on parchment paper or slate, the carriers of traditional maps are mostly paper, and various carriers such as electronic maps and the like appear along with the development of science and technology.

The navigation map has high requirements on the progress, the existing walking map has only one large range in some areas, when pedestrians walk according to the map, the conditions of winding a curved road and the like are easy to occur, and meanwhile, once the road has a situation, the pedestrians need to change the route again, so that the operation is complicated and time-consuming, and the time of the pedestrians is greatly wasted.

Disclosure of Invention

Therefore, the embodiment of the invention provides a map real-time updating device and method based on big data, which are characterized in that a mobile phone mobile terminal is combined with a collecting device, so that pedestrians collect information such as roads in walking tracks of the pedestrians in the walking process, and once the conditions are found, the information is immediately uploaded to a big data processing module, so that the map routes of the pedestrians are changed in real time and reasonably planned, and the problems that in the prior art, the existing walking map has only a large range in some areas, the pedestrians are easy to detour when walking according to the map, and the pedestrians need to change the routes again once the roads are in the conditions, the operation is complicated, the time is wasted, and the time of the pedestrians is greatly wasted are solved.

In order to achieve the above object, an embodiment of the present invention provides the following:

a big data-based map real-time updating device comprises:

the acquisition device is used for acquiring image information;

the mobile terminal is used for preprocessing data information and generating secondary map navigation model information;

and the big data processing module is used for carrying out calculation optimization analysis on the data and importing the information into the external terminal equipment.

As a preferred scheme of the present invention, the mobile terminal includes a mobile phone mobile terminal and a vehicle-mounted mobile terminal, both of which are connected to the big data processing module through a wireless module, the big data processing module is further connected to a data real-time storage module for storing real-time data and a terminal map navigation module for transmitting real-time information, both of which are connected to the acquisition device, and the acquisition device acquires and transmits external building and road information to the mobile terminal.

As a preferred scheme of the present invention, the mobile phone terminal and the vehicle-mounted mobile terminal both include a map module and a data storage processing module, and the mobile phone terminal and the vehicle-mounted mobile terminal are both connected to a data transmission module, the map module sends walking information or vehicle information and GPS positioning data to the big data processing module, and the big data processing module superimposes map navigation information data to calculate appropriate walking or driving map track distance information.

As a preferred scheme of the invention, the acquisition device comprises an acquisition main body frame, a data integration module and a mobile power supply located in the acquisition main body frame, wherein the data integration module comprises a bluetooth transceiver module and a storage, and the data integration module is integrally powered by the mobile power supply.

As a preferable scheme of the invention, the collection main body frame comprises a fixed cover, an auxiliary clamping block and a clamping component, a placing groove is formed in the lower surface of the fixed cover, the clamping component is located in the placing groove and is in sliding connection with the fixed cover, a limiting clamping block is respectively in sliding connection with the left end and the right end of the fixed cover, and a data interface is arranged on one side of the surface of one side of the limiting clamping block, which is close to the fixed cover.

As a preferable scheme of the invention, the clamping assembly comprises a rotating block and a sliding clamping block, the rotating block is connected with a plurality of rotating sleeves through torsion springs, clamping block sliding grooves are formed in the rotating sleeves, and the sliding clamping block is positioned in the clamping block sliding grooves and connected with the rotating sleeves through ejection springs.

As a preferable scheme of the present invention, a rotation groove is formed in the auxiliary clamping block, the auxiliary clamping block is slidably connected to the fixed cover, an ejector block rotatably connected to the auxiliary clamping block is disposed in the rotation groove, auxiliary clamping posts are rotatably connected to both ends of the ejector block, and a clamping post push-out spring is installed between a lower end side wall of the ejector block and the ejector block.

As a preferable scheme of the present invention, a plurality of cameras are disposed at four corner positions of the side surface of the fixed cover.

As a preferable aspect of the present invention, the calculation of the walking map track route information includes the steps of:

s100, requesting a map real-time information data model comprising a proportional path length, GPS positioning and data time nodes from a cloud map database through a mobile data network;

s200, rendering the specified path on the map real-time information data model through the terminal, capturing a screenshot of the rendered data, then acquiring the key point in the specified path, namely GPS dotting position information on the map real-time information data model, and then calculating the estimated arrival time of the current pedestrian by combining the walking speed and the proportional path length of the pedestrian;

s300, acquiring road conditions and building conditions along a map path through two groups of symmetrically arranged cameras, uploading the road conditions and the building conditions to a cloud map database through a mobile data network, and then combining the road conditions to form a sub data packet;

and S400, requesting a map real-time information data model comprising the proportional path length, the GPS positioning and the data time node from the cloud map database again through the mobile network data, storing the original data and covering the new data, and displaying the original data and the new data on a display screen of the terminal after covering an outside city.

As a preferred scheme of the present invention, in S300, the specific steps of obtaining the sub-packets are;

s301, setting a plurality of sub target points on a current specified path through a GPS dotting instrument to form a path monitoring database;

s302, acquiring road conditions and building conditions of a first child target point through two groups of symmetrically arranged cameras, uploading the road conditions and building conditions to a cloud map database through a mobile data network to form a first node data packet, then backing up and storing data in the first node data packet in a path monitoring database, directly deleting the data after the data is stored, continuously storing a second node data packet, and compressing and packaging the data to form an information coverage node after a plurality of child target points form n node data packets;

s303, requesting data information in the information coverage node from the cloud map database through the mobile data network, and forming a new map real-time information data model by combining GPS positioning and the map real-time information data model of the data time node.

The embodiment of the invention has the following advantages:

(1) according to the invention, through the combination of the mobile phone mobile terminal and the acquisition device, the pedestrians acquire information such as roads in the walking track in the walking process, and once the condition is found, the information is immediately uploaded to the big data processing module, so that the map route of the pedestrians is changed and reasonably planned in real time, the situation that the route needs to be changed ceaselessly when the subsequent pedestrians search the information is avoided, the timeliness is higher, compared with the traditional method of combining the pedestrians with the information acquisition component, the equipment enables some areas with fuzzy map representation to be fully displayed, and the situation of winding the road and the like is avoided;

(2) according to the invention, the acquisition device acquires and stores the information of the vehicle running track, so that a driver can upload a map with shorter distance and higher precision to the big data processing module in real time, a navigation map can be optimized in real time, and the acquisition device can upload the road jam information to the big data processing module in real time, so that a vehicle-mounted mobile terminal of a subsequent driver can be fed back and change a route in real time, and the large-scale traffic jam is avoided;

(3) the collecting device can be connected with a mobile phone terminal and can also be fixed at an air outlet of an air conditioner on a vehicle, and the collecting device is simple and convenient to operate and simple in structure and is easy to carry.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a flow chart of the calculation of the path information of the walking map;

FIG. 3 is a schematic view of the structure of the collecting device of the present invention;

FIG. 4 is a bottom view of the detent assembly of the present invention;

FIG. 5 is a side cross-sectional view of an auxiliary clamp block of the present invention.

In the figure:

1-a collecting device; 2-a clamping component; 3-a mobile power supply;

101-collecting the main frame; 102-a camera; 103-an auxiliary clamp splice; 104-a placement groove; 105-a limit clamping block; 106-data interface; 107-rotating grooves; 108-a top block; 109-auxiliary clamping columns; 110-a stationary shield; 111-clamping post push-out spring;

201-turning block; 202-a rotating sleeve; 203-clamping block sliding groove; 204-a sliding clamping block; 205-ejection spring.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 5, the present invention provides a real-time map updating apparatus based on big data, including:

an acquisition device 1 for acquiring image information;

the mobile terminal is used for preprocessing data information and generating secondary map navigation model information;

and the big data processing module is used for carrying out calculation optimization analysis on the data and importing the information into the external terminal equipment.

The mobile terminal comprises a mobile phone mobile terminal and a vehicle-mounted mobile terminal, wherein the mobile phone mobile terminal and the vehicle-mounted mobile terminal are both connected with a big data processing module through a wireless module, the big data processing module is also connected with a data real-time storage module for storing real-time data and a terminal map navigation module for transmitting real-time information, the terminal map navigation module transmits the information calculated and processed by the connection of the big data processing module to the mobile terminal in real time, so that the map navigation information on the map is changed when a user searches for the map, the mobile phone mobile terminal and the vehicle-mounted mobile terminal are both connected with an acquisition device 1, the acquisition device 1 acquires external building and road information and transmits the external building and road information to the mobile terminal, the acquisition device 1 can be connected with the mobile terminal through Bluetooth or a data line, and the connection modes are diversified, so that the application range of the equipment is wider.

The mobile phone mobile terminal and the vehicle-mounted mobile terminal both comprise a map module and a data storage processing module, the mobile phone mobile terminal and the vehicle-mounted mobile terminal are both connected with a data transmission module, the map module sends walking information or vehicle information and GPS positioning data to a big data processing module, and the big data processing module superposes map navigation information data and calculates proper walking or driving map track distance information.

The data storage processing module can store data when acquiring the data, the data storage processing module can acquire information only under a local area network, and the data information of the previous moment can be immediately covered and stored once the data storage processing module acquires the information, so that even if the terminal is disconnected, a map is displayed on the terminal.

The dotting of the GPS dotting instrument is realized by carrying out position identification on a built-in GPS of a big data processing module through a data request of the mobile terminal to the big data processing module, and the received dotting position data of the GPS dotting instrument, namely starting point data and key data, is displayed on the mobile terminal.

Collection system 1 is including gatheringmain body frame 101, data integration module and being located theportable power source 3 who gathersmain body frame 101, the data integration module includes bluetooth transceiver module and accumulator, just the data integration module carries out whole power supply throughportable power source 3, and thisportable power source 3 can be for the part power supply for the standby time of equipment is longer, and it is more simple and convenient that it removes simultaneously, and thisportable power source 3 still can be throughdata interface 106 to the mobile terminal power supply of cell-phone, makes the practicality of equipment stronger.

The acquisition device 1 can store the image information acquired by thecamera 102 and the distance information acquired by the GPS positioning device through the data integration module, and can transmit the image information and the distance information to the mobile terminal through the bluetooth transceiver module or thedata interface 106, so that the terminal transmits the data to the big data processing module.

The acquisitionmain body frame 101 comprises afixed cover 110, anauxiliary clamping block 103 and aclamping component 2, wherein a placinggroove 104 is arranged on the lower surface of thefixed cover 110, theclamping component 2 is positioned in the placinggroove 104 and is in sliding connection with thefixed cover 110, the left end and the right end of thefixed cover 110 are respectively in sliding connection with a limitingclamping block 105, when a user uses a mobile terminal of a mobile phone, the user can pull out a proper limitingclamping block 105 according to a socket of the mobile phone terminal, and simultaneously, the mobile phone can be charged after being plugged, and because a plurality ofcameras 102 are arranged at four corner positions on the side surface of thefixed cover 110, thecameras 102 can acquire information no matter the user installs equipment on the mobile phone or a vehicle, adata interface 106 is arranged on one side surface of the limitingclamping block 105 close to thefixed cover 110, and thedata interface 106 can be a USB or Type-C data interface, so that the application range of the device is wider.

Theclamping assembly 2 comprises arotating block 201 and a slidingclamping block 204, therotating block 201 is connected with a plurality of rotatingsleeves 202 through torsion springs, therotating sleeves 202 can reset freely, the situation that the rotatingsleeves 202 are scraped by external sundries due to falling off is avoided, clampingblock sliding grooves 203 are formed in the rotatingsleeves 202, and the slidingclamping block 204 is located in the clampingblock sliding grooves 203 and connected with the rotatingsleeves 202 through ejection springs 205.

When a user needs to mount the equipment on the vehicle, the user can rotate the rotatingblock 201 to enable the rotating block to be parallel to thefixed cover 110, then pull the slidingclamping block 204 open to enable the slidingclamping block 204 to compress the ejection spring 205, then the user can insert the slidingclamping block 204 into the vehicle-mounted air conditioner opening and then release the slidingclamping block 204, and therefore the equipment can be fully fixed.

Rotation groove 107 is opened in thesupplementary clamp splice 103, justsupplementary clamp splice 103 sliding connection is atfixed cover 110 both sides outer wall be equipped with in therotation groove 107 withsupplementary clamp splice 103 rotate thekicking block 108 of being connected the both ends ofkicking block 108 are rotated and are connected withsupplementary clamp post 109, and the installation clamp post between the lower extreme lateral wall ofkicking block 108 and kickingblock 108 pushes outspring 111.

When a user fixes the mobile phone terminal, the user can push out theauxiliary clamping block 103, so that the mobile phone pushes theauxiliary clamping column 109 at the lower end of theejector block 108, the clamping column push-outspring 111 is compressed, then theejector block 108 rotates, so that theauxiliary clamping column 109 at the upper end of the ejector block is pushed out to firmly fix the mobile phone, and if the user needs to detach the mobile phone, the user only needs to push the mobile phone to slide with thefixing cover 110.

A map real-time updating method based on big data,

the calculation of the walking map track distance information comprises the following steps:

s100, requesting a map real-time information data model comprising a proportional path length, GPS positioning and data time nodes from a cloud map database through a mobile data network;

s200, rendering the specified path on the map real-time information data model through the terminal, capturing a screenshot of the rendered data, then acquiring the key point in the specified path, namely GPS dotting position information on the map real-time information data model, and then calculating the estimated arrival time of the current pedestrian by combining the walking speed and the proportional path length of the pedestrian;

s300, acquiring road conditions and building conditions along a map path through two groups of symmetrically arranged cameras, uploading the road conditions and the building conditions to a cloud map database through a mobile data network, and then combining the road conditions to form a sub data packet;

and S400, requesting a map real-time information data model comprising the proportional path length, the GPS positioning and the data time node from the cloud map database again through the mobile network data, storing the original data and covering the new data, and displaying the original data and the new data on a display screen of the terminal after covering an outside city.

The acquisition device 1 can acquire road condition and building condition information when pedestrians walk at any time, then the road condition and building condition information is uploaded to the big data processing module, then the big data processing module can perform data processing analysis to enable the map of the mobile terminal to be more accurate, for example, once a user walks to a fuzzy area on the map, the acquisition device 1 can immediately acquire data, in order to enable the data acquisition to be more accurate, the acquisition device 1 is also connected with a GPS positioning device, so that the acquisition device 1 can acquire the accurate position of the area and information such as mark buildings in the area and store the information into a storage in the device, and meanwhile, under the condition of permission, the information can be transmitted to the mobile terminal through data lines or Bluetooth, the big data processing module can also immediately obtain the information, and then the big data processing module can immediately update the information of the area on the map, if the abnormal condition exists, the abnormal condition is uploaded through a storage device in the device.

Further, S301, a plurality of sub-target points are set on the current specified path through a GPS dotting instrument to form a path monitoring database;

s302, acquiring road conditions and building conditions of a first child target point through two groups of symmetrically arranged cameras, uploading the road conditions and building conditions to a cloud map database through a mobile data network to form a first node data packet, then backing up and storing data in the first node data packet in a path monitoring database, directly deleting the data after the data is stored, continuously storing a second node data packet, and compressing and packaging the data to form an information coverage node after a plurality of child target points form n node data packets;

s303, requesting data information in the information coverage node from the cloud map database through the mobile data network, and forming a new map real-time information data model by combining GPS positioning and the map real-time information data model of the data time node.

This sub-target point can be divided into a plurality of little targets with whole route, and collection system 1 can gather the information of a plurality of little target position departments simultaneously to obtain a plurality of data package, when the pedestrian needs to arrive a certain little target, in case the request at terminal is sent, big data processing module just can extract the data package of this little target department at once, carries out data analysis, makes the pedestrian can obtain the navigation map that the route is more normal, the stroke is shorter, makes the pedestrian can not appear the condition such as round the curved road.

Further, the calculation of the driving map track distance information comprises the following steps:

s001, requesting a map real-time information data model comprising a proportional path length, GPS positioning and data time nodes from a cloud map database through a mobile data network;

s002, rendering the specified path on the map real-time information data model through the terminal, screenshot the rendered data, acquiring the key point in the specified path, namely the GPS dotting position information on the map real-time information data model, and calculating the estimated arrival time of the current driver by combining the running speed of the vehicle and the proportional path length;

s003, acquiring road conditions and building conditions along a map path through two groups of symmetrically arranged cameras, uploading the road conditions and the building conditions to a cloud map database through a mobile data network, combining the road conditions to form new map real-time information data, and displaying the new map real-time information data on a terminal;

the real-time updating of the driving map is the same in the first two steps, but once the acquisition device 1 on the equipment acquires the road conditions such as road blockage, the road conditions are immediately transmitted to the big data processing module for calculation and analysis, so that the vehicle-mounted maps of the second to Nth drivers behind are covered by a more reasonable planned route and a more accurate map, and meanwhile, in order to enable a user to freely select whether to update the new map on the vehicle, if not, the original route data can be directly called.

In addition, road conditions and building conditions along the map path can be acquired through two groups of cameras which are symmetrically arranged, the road conditions and the building conditions are transmitted to the terminal, the terminal is backed up and stored, then the terminal is sent to the cloud map database through the mobile data network to perform optimization analysis, and then the autonomous planned route map is formed.

The acquisition device 1 can directly record and acquire the information of the current driving route and the vehicle of the driver, transmit the information to the big data processing module for calculation and analysis processing, and then transmit the information to the vehicle-mounted mobile terminal to obtain a new route map which is appreciated and used by more drivers.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. A big data-based map real-time updating device is characterized by comprising:

an acquisition device (1) for acquiring image information;

the mobile terminal is used for preprocessing data information and generating secondary map navigation model information;

and the big data processing module is used for carrying out calculation optimization analysis on the data and importing the information into the external terminal equipment.

2. The big data based map real-time updating device according to claim 1, wherein the mobile terminal comprises a mobile phone mobile terminal and a vehicle-mounted mobile terminal, the mobile phone mobile terminal and the vehicle-mounted mobile terminal are both connected with a big data processing module through wireless modules, the big data processing module is further connected with a data real-time storage module for storing real-time data and a terminal map navigation module for transmitting real-time information, the mobile phone mobile terminal and the vehicle-mounted mobile terminal are both connected with the collecting device (1), and the collecting device (1) collects external building and road information and transmits the external building and road information to the mobile terminal.

3. The big-data-based map real-time updating device according to claim 2, wherein the mobile phone mobile terminal and the vehicle-mounted mobile terminal both comprise a map module and a data storage processing module, the mobile phone mobile terminal and the vehicle-mounted mobile terminal are both connected with a data transmission module, the map module sends walking information or vehicle information and GPS positioning data to the big-data processing module, and the big-data processing module superposes map navigation information data and calculates appropriate walking or driving map track distance information.

4. The big data-based map real-time updating device according to claim 1, wherein the collecting device (1) comprises a collecting main body frame (101), a data integration module and a mobile power supply (3) positioned in the collecting main body frame (101), the data integration module comprises a Bluetooth transceiver module and a storage, and the data integration module is integrally powered by the mobile power supply (3).

5. The big-data-based map real-time updating device according to claim 4, wherein the collecting main body frame (101) comprises a fixed cover (110), an auxiliary clamping block (103) and a clamping component (2), a placing groove (104) is formed in the lower surface of the fixed cover (110), the clamping component (2) is located in the placing groove (104) and is in sliding connection with the fixed cover (110), a limiting clamping block (105) is respectively in sliding connection with the left end and the right end of the fixed cover (110), and a data interface (106) is arranged on one side, close to the fixed cover (110), of one side surface of the limiting clamping block (105).

6. The big-data-based map real-time updating device according to claim 5, wherein the clamping assembly (2) comprises a rotating block (201) and a sliding clamping block (204), the rotating block (201) is connected with a plurality of rotating sleeves (202) through torsion springs, clamping block sliding grooves (203) are formed in the rotating sleeves (202), and the sliding clamping block (204) is located in the clamping block sliding grooves (203) and connected with the rotating sleeves (202) through ejection springs (205).

7. The big-data-based map real-time updating device according to claim 5, wherein a rotating groove (107) is formed in the auxiliary clamping block (103), the auxiliary clamping block (103) is slidably connected with the fixed cover (110), a top block (108) rotatably connected with the auxiliary clamping block (103) is arranged in the rotating groove (107), auxiliary clamping columns (109) are rotatably connected to two ends of the top block (108), and a clamping column push-out spring (111) is arranged between the side wall of the lower end of the top block (108) and the top block (108).

8. A big data based map real-time updating device as claimed in claim 5, wherein several cameras (102) are arranged at four corner positions of the side of the fixed cover (110).

9. A map real-time updating method based on big data is characterized in that the calculation of the path information of a walking map track comprises the following steps:

s100, requesting a map real-time information data model comprising a proportional path length, GPS positioning and data time nodes from a cloud map database through a mobile data network;

s200, rendering the specified path on the map real-time information data model through the terminal, capturing a screenshot of the rendered data, then acquiring the key point in the specified path, namely GPS dotting position information on the map real-time information data model, and then calculating the estimated arrival time of the current pedestrian by combining the walking speed and the proportional path length of the pedestrian;

s300, acquiring road conditions and building conditions along a map path through two groups of symmetrically arranged cameras, uploading the road conditions and the building conditions to a cloud map database through a mobile data network, and then combining the road conditions to form a sub data packet;

and S400, requesting a map real-time information data model comprising the proportional path length, the GPS positioning and the data time node from the cloud map database again through the mobile network data, storing the original data and covering the new data, and displaying the original data and the new data on a display screen of the terminal after covering an outside city.

10. The big-data-based map real-time updating method according to claim 9, wherein in S300, the sub-packets are obtained by the specific steps of;

s301, setting a plurality of sub target points on a current specified path through a GPS dotting instrument to form a path monitoring database;

s302, acquiring road conditions and building conditions of a first child target point through two groups of symmetrically arranged cameras, uploading the road conditions and building conditions to a cloud map database through a mobile data network to form a first node data packet, then backing up and storing data in the first node data packet in a path monitoring database, directly deleting the data after the data is stored, continuously storing a second node data packet, and compressing and packaging the data to form an information coverage node after a plurality of child target points form n node data packets;

s303, requesting data information in the information coverage node from the cloud map database through the mobile data network, and forming a new map real-time information data model by combining GPS positioning and the map real-time information data model of the data time node.

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