CN107063137A - A kind of dam based on unmanned plane inrushes areal calculation and emergent treatment system - Google Patents
A kind of dam based on unmanned plane inrushes areal calculation and emergent treatment system Download PDFInfo
- Publication number
- CN107063137A CN107063137A CN201710429070.2A CN201710429070A CN107063137A CN 107063137 A CN107063137 A CN 107063137A CN 201710429070 A CN201710429070 A CN 201710429070A CN 107063137 A CN107063137 A CN 107063137A
- Authority
- CN
- China
- Prior art keywords
- unmanned plane
- processing system
- fuselage
- inrushes
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
Abstract
Inrushed areal calculation and emergent treatment system the invention discloses a kind of dam based on unmanned plane, including unmanned plane body and flood control monitoring station, fuselage processing system is provided with unmanned plane body, flight control system and fuselage wireless transport module, unmanned plane body lower end is provided with head, head lower end is provided with monitoring camera and laser range finder, fuselage processing system is respectively and flight control system, fuselage wireless transport module, head, monitor camera, laser range finder is electrically connected with, flood control is provided with central processing system in monitoring station, ground-based wireless transmissions module, operating platform and display screen, region altitude information storehouse and real time water level database are provided with central processing system, ground-based wireless transmissions module is respectively and central processing system, operating platform, display screen is electrically connected with, the present invention strengthens the safety monitoring to dam, when dam inrushes, effective emergence treatment scheme is made in time, the effect that the condition of a disaster spreads can effectively be controlled.
Description
Technical field
The present invention relates to dam repair and maintenance field, more particularly to a kind of dam based on unmanned plane inrush areal calculation and
Emergent treatment system.
Background technology
Dam is the hinge of water conservancy, can reasonably configure river water resource to bring huge facility,
But when situation about being inrushed in the case of dam is not safeguarded in time or maintenance work is insufficient, if not timely
Control, its institute can caused by destroy be also to estimate.
Current dam safety monitoring is to Hydraulic and Hydro-Power Engineering agent structure, ground base by Instrument observation and walkaround inspection
Plinth, two sides side slope, related facility and surrounding environment measurements made and observation;" monitoring " had both included fixing measuring point to building
The Instrument observation carried out by certain frequency, also including periodically or non-periodically straight to building appearance and internal a wide range of object
See inspection and instrument is detected.But what the tour to dam was relied on now is still artificial progress inspection, and artificial progress inspection can sighting distance
The observation position being manually relatively inaccessible to from shorter and presence, so as to can observe not, comprehensively, careful and manual patrol does not leak easily
Inspection, and can not calculate in time when situation occurs inrushing in dam the size, flood discharge, flood axis for the mouth that inrushes with
And hazard scope and position, i.e. emergence treatment scheme are short of.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of dam based on unmanned plane and inrushed areal calculation and emergent
Processing system, to solve caused above-mentioned multinomial defect in the prior art.
To achieve the above object, the present invention provides following technical scheme:A kind of dam based on unmanned plane inrushes area
Calculate and emergent treatment system, including unmanned plane body and flood control monitoring station, the unmanned plane body is interior to be provided with fuselage processing system
System, flight control system and fuselage wireless transport module, the unmanned plane body lower end are provided with head, and the head lower end is provided with monitoring
Camera and laser range finder, the fuselage processing system respectively with flight control system, fuselage wireless transport module, head, monitoring
Camera, laser range finder are electrically connected with, be provided with the flood control monitoring station central processing system, ground-based wireless transmissions module,
Region altitude information storehouse and real time water level database are provided with operating platform and display screen, the central processing system, describedly
Face wireless transport module is electrically connected with central processing system, operating platform, display screen respectively.
It is preferred that, GPS positioning device, the GPS positioning device and fuselage processing system are provided with the unmanned plane body
It is electrically connected with.
It is preferred that, the fuselage of the monitoring camera and laser range finder is parallel to each other.
It is preferred that, the head is provided with angular transducer, and angular transducer and the fuselage processing system is electrically connected with.
It is preferred that, the unmanned plane body is provided with barometer, and barometer and the fuselage processing system is electrically connected with.
It is preferred that, storage module, storage module and ground-based wireless transmissions the module electricity are provided with the flood control monitoring station
Property connection.
Beneficial effect using above technical scheme is:A kind of dam based on unmanned plane of the present invention inrushes areal calculation
And emergent treatment system, between flood control monitoring station and unmanned plane body it is wirelessly transferred by ground-based wireless transmissions module and fuselage
Module mutually transmits signal, and operating platform operates the flight path of unmanned plane body, and operation head by flight control system
Angle of inclination, laser range finder and monitoring camera mutually be horizontally disposed with, cloud platform rotation to appropriate angle, angular transducer
The rotational angle of head is measured, allows monitoring camera to be mutually perpendicular to dykes and dams surface, so, laser range finder can detect to take the photograph
As the air line distance between head and dykes and dams, if it find that where is it inrushes mouth on dykes and dams, barometer can calculate at that time nobody
GPS positioning device on the height of machine body, unmanned plane body can be sent out location information with precise positioning to the position for the mouth that inrushes
Feeding device body processing system, monitoring camera is shot to the mouth that inrushes, and laser range finder calculates monitoring camera with inrushing
Air line distance between mouthful, and fuselage processing system is given by these information transmissions, fuselage processing system images longitude and latitude, monitoring
These data on a frame frame picture, are wirelessly transferred mould by head by fuselage afterwards with the distance for the mouth that inrushes and rotational angle watermark
Block passes to the ground-based wireless transmissions module of flood control monitoring station, passes through central processing system, and monitoring camera and the mouth that inrushes
Air line distance, angle, the vertical height of unmanned plane body and the amplification for monitoring camera for monitoring camera between the mouth that inrushes
Multiple calculates the size for the mouth that actually inrushes, according to the size for the mouth that actually inrushes and the height of real time water level, to be inferred to
The flow of flood, then by analyzing the photo passed over, flood axis, central processing system root are judged according to multiframe frame difference
The region that may occur the condition of a disaster is analyzed according to region altitude information storehouse and real time water level database, is passed through while providing no flood
Fire area, area estimation disaster area is flowed through according to flood, by these feedback of the information on a display screen, rescued in time to correlation
Help department and disaster information is provided, in order to wear enough rescue materials and the enough rescue personnels of configuration, rescued in time
Help, it is to avoid disaster further spreads.
Brief description of the drawings
Fig. 1 is the system block diagram of the present invention.
Wherein, 1- unmanned planes body, 2- flood controls monitoring station, 3- fuselage processing systems, 4- flight control systems, 5- fuselages are wirelessly passed
Defeated module, 6- heads, 7- monitoring cameras, 8- laser range finders, 9- central processing systems, 10- ground-based wireless transmissions modules,
11- operating platforms, 12- display screens, 13- regions altitude information storehouse, 14- real time water level databases, 15-GPS positioners, 16-
Angular transducer, 17- barometers, 18- storage modules.
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 shows the embodiment of the present invention:A kind of dam based on unmanned plane inrushes areal calculation and emergent place
Provided with fuselage processing system 3, winged control system in reason system, including unmanned plane body 1 and flood control monitoring station 2, the unmanned plane body 1
System 4 and fuselage wireless transport module 5, the lower end of unmanned plane body 1 are provided with head 6, and the lower end of head 6 is imaged provided with monitoring
First 7 and laser range finder 8, the fuselage processing system 3 respectively with flight control system 4, fuselage wireless transport module 5, head 6, prison
Survey camera 7, laser range finder 8 to be electrically connected with, central processing system 9, ground-based wireless transmissions are provided with the flood control monitoring station 2
Region altitude information storehouse 13 and real time water level are provided with module 10, operating platform 11 and display screen 12, the central processing system 9
Database 14, the ground-based wireless transmissions module 10 electrically connects with central processing system 9, operating platform 11, display screen 12 respectively
Connect.
In the present embodiment, GPS positioning device 15, the GPS positioning device 15 and fuselage are provided with the unmanned plane body 1
Processing system 3 is electrically connected with.
In the present embodiment, the fuselage of the monitoring camera 7 and laser range finder 8 is parallel to each other.
In the present embodiment, the head 6 is provided with angular transducer 16, the angular transducer 16 and fuselage processing system
3 are electrically connected with.
In the present embodiment, the unmanned plane body 1 is provided with barometer 17, the barometer 17 and fuselage processing system 3
It is electrically connected with.
In the present embodiment, storage module 18 is provided with the flood control monitoring station 2, the storage module 18 and terrestrial wireless are passed
Defeated module 10 is electrically connected with, and all information sent are stored, facilitate the later stage to be transferred the files.
Based on above-mentioned:A kind of dam based on unmanned plane of the present invention inrushes areal calculation and emergent treatment system, flood control
It is mutually to be transmitted by ground-based wireless transmissions module 10 and fuselage wireless transport module 5 between monitoring station 2 and unmanned plane body 1
Signal, operating platform 11 operates the flight path of unmanned plane body 1 by flight control system 4, and operates the inclination angle of head 6
Degree, laser range finder 8 and monitoring camera 7 are mutually horizontally disposed, and head 6 turns to appropriate angle, and angular transducer 16 is surveyed
The rotational angle of head 6 is obtained, allows monitoring camera 7 to be mutually perpendicular to dykes and dams surface, so, laser range finder 8 can be detected
Air line distance between camera and dykes and dams, if it find that where is it inrushes mouth on dykes and dams, barometer 17 can be calculated at that time
GPS positioning device 15 on the height of unmanned plane body 1, unmanned plane body 1 can be with precise positioning to the position for the mouth that inrushes, will be fixed
Position information is sent to fuselage processing system 3, and monitoring 7 pairs of mouths that inrush of camera are shot, and laser range finder 8 calculates monitoring and taken the photograph
As the air line distance between first 7 and the mouth that inrushes, and by these information transmissions to fuselage processing system 3, fuselage processing system 3 will be through
Latitude, the distance of monitoring camera 7 and the mouth that inrushes and rotational angle watermark afterwards pass through these data on a frame frame picture
Fuselage wireless transport module 5 passes to the ground-based wireless transmissions module 10 of flood control monitoring station 2, passes through central processing system 9, and prison
Angle, the vertical height of unmanned plane body 1 between air line distance, monitoring camera 7 and the mouth that inrushes of survey camera 7 and the mouth that inrushes
Spend and monitor the multiplication factor of camera 7 to calculate the size for the mouth that actually inrushes, according to the size and reality of the mouth that actually inrushes
Shi Shuiwei height, to be inferred to the flow of flood, then by analyzing the photo passed over, flood is judged according to multiframe frame difference
According to region altitude information storehouse 13 and real time water level database 14 to analyze the condition of a disaster may occur for current direction, central processing system 9
Region, while provide without flood pass through fire area, area estimation disaster area is flowed through according to flood, by these information
Feedback on the display 12, provides disaster information to related rescue department in time, in order to wear enough rescue material and
The enough rescue personnels of configuration, are rescued, it is to avoid disaster further spreads in time.
Above-described is only the preferred embodiment of the present invention, it is noted that for one of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection domain.
Claims (6)
- Areal calculation and emergent treatment system 1. a kind of dam based on unmanned plane inrushes, including unmanned plane body (1) and flood control Monitoring station (2), it is characterised in that:Fuselage processing system (3), flight control system (4) and fuselage are provided with the unmanned plane body (1) Wireless transport module (5), unmanned plane body (1) lower end is provided with head (6), and head (6) lower end is imaged provided with monitoring Head (7) and laser range finder (8), the fuselage processing system (3) respectively with flight control system (4), fuselage wireless transport module (5), head (6), monitoring camera (7), laser range finder (8) are electrically connected with, and centre is provided with the flood control monitoring station (2) In reason system (9), ground-based wireless transmissions module (10), operating platform (11) and display screen (12), the central processing system (9) Provided with region altitude information storehouse (13) and real time water level database (14), the ground-based wireless transmissions module (10) is respectively and central Processing system (9), operating platform (11), display screen (12) are electrically connected with.
- Areal calculation and emergent treatment system 2. a kind of dam based on unmanned plane according to claim 1 inrushes, it is special Levy and be:GPS positioning device (15), the GPS positioning device (15) and fuselage processing system are provided with the unmanned plane body (1) System (3) is electrically connected with.
- Areal calculation and emergent treatment system 3. a kind of dam based on unmanned plane according to claim 1 inrushes, it is special Levy and be:The fuselage of the monitoring camera (7) and laser range finder (8) is parallel to each other.
- Areal calculation and emergent treatment system 4. a kind of dam based on unmanned plane according to claim 1 inrushes, it is special Levy and be:The head (6) is provided with angular transducer (16), the angular transducer (16) and fuselage processing system (3) electricity Property connection.
- Areal calculation and emergent treatment system 5. a kind of dam based on unmanned plane according to claim 1 inrushes, it is special Levy and be:The unmanned plane body (1) is provided with barometer (17), and the barometer (17) and fuselage processing system (3) are electrically Connection.
- Areal calculation and emergent treatment system 6. a kind of dam based on unmanned plane according to claim 1 inrushes, it is special Levy and be:Storage module (18), the storage module (18) and ground-based wireless transmissions module are provided with the flood control monitoring station (2) (10) it is electrically connected with.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710429070.2A CN107063137A (en) | 2017-06-08 | 2017-06-08 | A kind of dam based on unmanned plane inrushes areal calculation and emergent treatment system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710429070.2A CN107063137A (en) | 2017-06-08 | 2017-06-08 | A kind of dam based on unmanned plane inrushes areal calculation and emergent treatment system |
Publications (1)
Publication Number | Publication Date |
---|---|
CN107063137A true CN107063137A (en) | 2017-08-18 |
Family
ID=59616014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201710429070.2A Pending CN107063137A (en) | 2017-06-08 | 2017-06-08 | A kind of dam based on unmanned plane inrushes areal calculation and emergent treatment system |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN107063137A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107727239A (en) * | 2017-10-20 | 2018-02-23 | 江苏筑升土木工程科技有限公司 | A kind of the dam leakage method of telemetering and system based on unmanned plane |
CN108516092A (en) * | 2018-03-27 | 2018-09-11 | 钟静海 | The pesticide spraying system of agricultural unmanned plane |
CN108719242A (en) * | 2018-03-27 | 2018-11-02 | 钟静海 | Pesticide spraying system |
CN108982316A (en) * | 2018-06-14 | 2018-12-11 | 河海大学文天学院 | One kind being based on unmanned machine testing dam back side concrete surface osmotic system and method |
CN110866990A (en) * | 2019-12-09 | 2020-03-06 | 浙江顿悟科技有限公司 | Unmanned aerial vehicle-based power inspection method |
CN111539568A (en) * | 2020-04-22 | 2020-08-14 | 深圳市地质局 | Safety monitoring system and method based on unmanned aerial vehicle and three-dimensional modeling technology |
CN111982031A (en) * | 2020-08-24 | 2020-11-24 | 江苏科技大学 | Water surface area measuring method based on unmanned aerial vehicle vision |
CN113485415A (en) * | 2021-06-28 | 2021-10-08 | 中交遥感载荷(江苏)科技有限公司 | Rescue and disaster relief method based on unmanned aerial vehicle system and unmanned aerial vehicle system thereof |
CN113933871A (en) * | 2021-10-15 | 2022-01-14 | 贵州师范学院 | Flood disaster detection system based on unmanned aerial vehicle and Beidou positioning |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102381481A (en) * | 2011-08-01 | 2012-03-21 | 四川省科学城久利科技实业有限责任公司 | Unmanned aerial vehicle-mounted laser radar system |
CN104535649A (en) * | 2014-12-25 | 2015-04-22 | 刘凯 | Unmanned intelligent detection machine for cracks |
CN106054927A (en) * | 2016-08-04 | 2016-10-26 | 北方民族大学 | Intelligent channel tour-inspection device and system based on UAV (Unmanned Aerial Vehicle) and measurement method |
CN106124517A (en) * | 2015-09-29 | 2016-11-16 | 柳州欧维姆机械股份有限公司 | Detect many rotor wing unmanned aerial vehicles detection platform system in structural member surface crack and for the method detecting structural member surface crack |
EP3093616A1 (en) * | 2015-05-13 | 2016-11-16 | Centre National d'Etudes Spatiales | Device and method for designating characteristic points |
CN106200676A (en) * | 2016-08-18 | 2016-12-07 | 广州地理研究所 | A kind of monitoring system based on unmanned plane |
CN106326865A (en) * | 2016-08-25 | 2017-01-11 | 广州地理研究所 | Water project area real-time monitoring system, method and device based on unmanned aerial vehicle |
CN106323243A (en) * | 2016-08-18 | 2017-01-11 | 广州地理研究所 | Dam deformation observation early-warning system, method and device based on unmanned aerial vehicle |
CN106686354A (en) * | 2017-01-16 | 2017-05-17 | 广东容祺智能科技有限公司 | Drone patrol measuring system and measuring method thereof |
-
2017
- 2017-06-08 CN CN201710429070.2A patent/CN107063137A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102381481A (en) * | 2011-08-01 | 2012-03-21 | 四川省科学城久利科技实业有限责任公司 | Unmanned aerial vehicle-mounted laser radar system |
CN104535649A (en) * | 2014-12-25 | 2015-04-22 | 刘凯 | Unmanned intelligent detection machine for cracks |
EP3093616A1 (en) * | 2015-05-13 | 2016-11-16 | Centre National d'Etudes Spatiales | Device and method for designating characteristic points |
CN106124517A (en) * | 2015-09-29 | 2016-11-16 | 柳州欧维姆机械股份有限公司 | Detect many rotor wing unmanned aerial vehicles detection platform system in structural member surface crack and for the method detecting structural member surface crack |
CN106054927A (en) * | 2016-08-04 | 2016-10-26 | 北方民族大学 | Intelligent channel tour-inspection device and system based on UAV (Unmanned Aerial Vehicle) and measurement method |
CN106200676A (en) * | 2016-08-18 | 2016-12-07 | 广州地理研究所 | A kind of monitoring system based on unmanned plane |
CN106323243A (en) * | 2016-08-18 | 2017-01-11 | 广州地理研究所 | Dam deformation observation early-warning system, method and device based on unmanned aerial vehicle |
CN106326865A (en) * | 2016-08-25 | 2017-01-11 | 广州地理研究所 | Water project area real-time monitoring system, method and device based on unmanned aerial vehicle |
CN106686354A (en) * | 2017-01-16 | 2017-05-17 | 广东容祺智能科技有限公司 | Drone patrol measuring system and measuring method thereof |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107727239A (en) * | 2017-10-20 | 2018-02-23 | 江苏筑升土木工程科技有限公司 | A kind of the dam leakage method of telemetering and system based on unmanned plane |
CN108516092A (en) * | 2018-03-27 | 2018-09-11 | 钟静海 | The pesticide spraying system of agricultural unmanned plane |
CN108719242A (en) * | 2018-03-27 | 2018-11-02 | 钟静海 | Pesticide spraying system |
CN108719242B (en) * | 2018-03-27 | 2020-12-29 | 钟静海 | Pesticide spraying system |
CN108982316A (en) * | 2018-06-14 | 2018-12-11 | 河海大学文天学院 | One kind being based on unmanned machine testing dam back side concrete surface osmotic system and method |
CN108982316B (en) * | 2018-06-14 | 2020-11-27 | 河海大学文天学院 | Dam back surface concrete surface seepage detection system and method based on unmanned aerial vehicle |
CN110866990A (en) * | 2019-12-09 | 2020-03-06 | 浙江顿悟科技有限公司 | Unmanned aerial vehicle-based power inspection method |
CN111539568A (en) * | 2020-04-22 | 2020-08-14 | 深圳市地质局 | Safety monitoring system and method based on unmanned aerial vehicle and three-dimensional modeling technology |
CN111982031A (en) * | 2020-08-24 | 2020-11-24 | 江苏科技大学 | Water surface area measuring method based on unmanned aerial vehicle vision |
CN111982031B (en) * | 2020-08-24 | 2021-12-31 | 衡阳市大雁地理信息有限公司 | Water surface area measuring method based on unmanned aerial vehicle vision |
CN113485415A (en) * | 2021-06-28 | 2021-10-08 | 中交遥感载荷(江苏)科技有限公司 | Rescue and disaster relief method based on unmanned aerial vehicle system and unmanned aerial vehicle system thereof |
CN113933871A (en) * | 2021-10-15 | 2022-01-14 | 贵州师范学院 | Flood disaster detection system based on unmanned aerial vehicle and Beidou positioning |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107063137A (en) | A kind of dam based on unmanned plane inrushes areal calculation and emergent treatment system | |
KR102067136B1 (en) | Construction work management system using mapping-drone | |
KR101692781B1 (en) | Drone - Sensor Interconnected Disaster Management System | |
CN104064055B (en) | A kind of inland river navigation boats and ships superelevation detects early warning system and method for work thereof | |
CN105865427A (en) | Individual geological disaster emergency investigation method based on remote sensing of small unmanned aerial vehicle | |
CN109357617A (en) | A kind of high precipitous rock slope displacement deformation monitoring method based on unmanned plane | |
KR101861045B1 (en) | Drones for manhole and river facility inspection | |
CN105913604A (en) | Fire occurrence determining method and device based on unmanned aerial vehicle | |
CN106645577A (en) | Toxic and harmful gas detection system based on multi-rotor unmanned aerial vehicle platform | |
JP2008057994A (en) | Water level observation system by image processing | |
KR20170101519A (en) | Apparatus and method for disaster monitoring using unmanned aerial vehicle | |
CN107464046A (en) | A kind of Geological Hazards Monitoring assessment system based on unmanned plane | |
JP2016180681A (en) | Ground collapse detection system | |
CN113223087A (en) | Target object geographic coordinate positioning method and device based on video monitoring | |
JP2011095112A (en) | Three-dimensional position measuring apparatus, mapping system of flying object, and computer program | |
US11105610B2 (en) | Apparatus and method for remote optical caliper measurement | |
CN102706331B (en) | Correction method for aerial surveying and mapping images | |
KR20230025260A (en) | TM Coordinate Based Flow Rate Measurement Device and Method Using Drone | |
KR102313178B1 (en) | Measuring method for ground settlement using drone | |
CN108765237A (en) | A kind of fire-fighting AR aid decision-making systems and method based on environmental monitoring | |
KR101028136B1 (en) | System and method for disaster alarm of structure by displacement based on single photogrammetry | |
CN110411431A (en) | Tall and big frame body verticality based on Beidou dual-antenna system monitors system and method | |
Pagano et al. | Development and testing of an unmanned aerial vehicle for large scale particle image velocimetry | |
Blanks | UAS applications | |
CN106303412A (en) | Refuse dump displacement remote real time monitoring apparatus and method based on monitoring image |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
WD01 | Invention patent application deemed withdrawn after publication | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170818 |