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Mobile mapping system

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Mobile mapping
Mobile mapping
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Mobile mapping system

  1. 1. suported by yanto budisusanto wahyu martha mutiarasari
  2. 2.  3D scaning face area with 3600  Easy taking an object  Knowledge the location is necessary  Documention a long the road can be sorounding with 3600  GPS, Inner Box – accuracy in cm  Capture 3600 continuously with a thausand data each secon  MMS is an effectife and reliable method  While the system collect data the driver can focus following the normal traffic flow  Regristrasi combines imagery and laser scene data
  3. 3.  The idea was to provide an accurate and economical means of collecting spatial data.  Conventional methods were too expensive and time consuming.
  4. 4. A mobile mapping system can be defined as "a moving platform, upon which multiple sensor/measurement systems have been integrated to provide three-dimensional near-continuous positioning of both the platform and simultaneously collected geo- spatial data, with no or limited ground control using single or multiple GPS base stations" [Grejner-Brzezinska, 2002].
  5. 5.  Large Format Photo  Denmark Site  Check The Crew  Check The Weather  Stored Unit  Aerial Camera  Keep The Camera On The Right Position  Orthophoto Produk like Google Earth  4 Camera – each produces single colour CMYK  High Resolution Image
  6. 6. Three basic measurement components comprise most MMS:  global positioning system (GPS),  inertial measurement unit (IMU) or other form of dead-reckoning sensor, and  an image capture system
  7. 7. The enhancements in computers and computer processing, MMS has undergone significant changes during the decade that it has been utilized in production. For example in the first generation of the GPSVanTM, wheel sensors (odometers) and gyros were used to determine heading, attitude, and distance. Today, these systems have been updated with IMU.
  8. 8. a mobile mapping system that utilizes multiple sensors is “the product of integrating the concepts of kinematic geodesy and digital photogrammetry, to acquire, store, and process, measurable quantities that sufficiently describe spatial and/or physical characteristics of a part of the Earth’s surface” [Mostafa and Schwarz, 2001].
  9. 9.  While a MMS is often associated with data capture strategies using vans, in reality it involves any scenario where the sensors are in motion.  This includes, in part, vans, airplanes, satellites and humans walking from place to place. Lidar (Light Detection And Ranging), or laser altimetry, is an example mobile mapping system where the image capture involves range measurements instead of conventional imagery.  Other image capture techniques, such as hyperspectral, promise to expand the applications of mobile systems
  10. 10. Land vehicle navigation has been around for some time. Numerous developments have occurred in • Automatic Vehicle Location and Navigation (AVLN) • Intelligent Vehicle Highway Systems (IVHS) • Intelligent Transportation Systems (ITS) • Mobile Mapping Systems (MMS)
  11. 11. GPS Autonomous ITS Satellites  Self contained  Incoming signal for positioning only  Onboard electronic chart system  No dedicated dispatch or control center  No communication link  No dedicated traffic or weather information GPS antenna Electronic chart GPS receiver [Krakiwsky, 1993]
  12. 12. Fleet Management ITS GPS Satellites Electronic Chart System Dispatching Center  Fleets of multiple vehicle  Electronic chart system in the dispatching center.  One or two way communication with dispatcher. Vehicles  On-board positioning sensors.  Position polling and smart reporting. [Krakiwsky, 1993]
  13. 13.  Multiple vehicles  Route advice and guidance for traffic avoidance Advisory ITS  Two-way communication link GPS Satellites  On-line traffic and weather information  Centralized or decentralized structure  Steering (control) is possible Communications part of the beacon traffic-dependent route recommendation city map Positioning Traffic Navigation guidance center Travel time measurement [Krakiwsky, 1993]
  14. 14. Inventory ITS GPS Satellites  Usually autonomous vehicles involved  Time tagging of information  Coordinate tagging of information  Communication link (possible)  Onboard map database  Taxation and route surveys  Resource inventory Digital or video cameras for data collection GPS receiver Onboard data logger & map display [Krakiwsky, 1993]
  15. 15.  The VISAT van is designed to achieve high accuracy survey data collection in an operational environment with speeds up to 60 km/hr.  The system is comprised of • a Honeywell Laser-Ref III strapdown inertial measurement system, • two Ashteck Z12 GPS receivers, • a cluster of 8 video cameras, • an anti-braking-system (ABS) pick-up, • a Super Video Home System (SVHS), and • an image control unit.
  16. 16. El-Sheimy and Schwarz [1998-99] identify the primary and secondary functions of the components in table 2.
  17. 17.  Not all MMS utilize the same number or types of sensors.  For example, Lambda Tech2 operates the GPSVisionTM, which utilizes : • a Trimble 7400 dual frequency GPS receiver, • a Litton LN-200 INS, and • two progressive CCD cameras (one color and one black/white).
  18. 18.  Advanced mobile mapping system consists of four basic parts within an operational environment. • Aan imaging component, • A georeferencing component, and • A photogrammetric measurement component. • They are brought together through a calibration component.
  19. 19.  System calibration, which is performed after the system is completely assembled, consisting of • GPS/INS lever arm – this is the distance between the phase center of the GPS antenna and the center of the INS body frame. • Camera calibration. • INS/camera boresight calibration, which is the distance offset and angular relationship of the INS and camera to the body frame.  GPS/INS/image data collection, which comprises • GPS/INS/camera time synchronization. • Data logging. • Image compression and storage  GPS/INS post processing involving the georeferencing of the time tagged images by computing the six exterior orientation parameters  Image processing of the images to determine the location of the georeferenced features of interest within the imagery.
  20. 20.  The navigation component consists of two basic systems: GPS and the IMU.  The primary function of the GPS receiver is • to provide position information for the imaging sensor at the instant of measurement (exposure),  The GPS receivers are used in a differential mode with one receiver 3 located on the vehicle and one receiver set up over a known control point in the survey area.  For a more robust solution, two base stations can be occupied simultaneously with GPS. This will yield two positions for the GPS roving receiver and helps in quality control of the MMS.  Carrier phase is generally measured because it provides a much higher accuracy than pseudorange measurements.
  21. 21.  There are numerous benefits that can accrue from MMS. Grejner-Brzezinska [2001a] states that “multisensor systems provide complementary, fast, accurate, faultresistant, and cost-effective data that can be used in a variety of mapping tools”.  Other benefits include [Grejner-Brzezinska, 2001a; 2001b] • A cost savings in data collection of around 10:1. • A reduction of field trips at again a 10:1 ratio. • Proactive asset management. • Improved service by reducing turn around time. • Increased productivity through automation. • Optimizing data flow.
  22. 22.  Mobile mapping is making a significant impact in spatial and attribute data collection.  Future technological developments and a better understanding of the interchange between different sensors will make MMS a more robust and dynamic real time mapping and information management system.

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