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Sensor integration in a low cost land mobile mapping system.

Madeira S, Gonçalves JA, Bastos L - Sensors (Basel) (2012)

Bottom Line: Mobile mapping is a multidisciplinary technique which requires several dedicated equipment, calibration procedures that must be as rigorous as possible, time synchronization of all acquired data and software for data processing and extraction of additional information.To decrease the cost and complexity of Mobile Mapping Systems (MMS), the use of less expensive sensors and the simplification of procedures for calibration and data acquisition are mandatory features.The results discussed here show that this goal has been achieved.

View Article: PubMed Central - PubMed

Affiliation: Universidade de Tras-Os-Montes e Alto Douro, Vila Real, Portugal. smadeira@utad.pt

ABSTRACT
Mobile mapping is a multidisciplinary technique which requires several dedicated equipment, calibration procedures that must be as rigorous as possible, time synchronization of all acquired data and software for data processing and extraction of additional information. To decrease the cost and complexity of Mobile Mapping Systems (MMS), the use of less expensive sensors and the simplification of procedures for calibration and data acquisition are mandatory features. This article refers to the use of MMS technology, focusing on the main aspects that need to be addressed to guarantee proper data acquisition and describing the way those aspects were handled in a terrestrial MMS developed at the University of Porto. In this case the main aim was to implement a low cost system while maintaining good quality standards of the acquired georeferenced information. The results discussed here show that this goal has been achieved.

No MeSH data available.


Image acquisition architecture.
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f9-sensors-12-02935: Image acquisition architecture.

Mentions: Cameras are connected to the laptop through a Firewire card port and the images are stored in JPEG format (a complete scheme is presented in Figure 9). It is necessary to get a precise time for each acquired image to precisely discriminate their position and attitude in the absolute reference system. The external trigger possibility offered by the cameras is used in conjunction with the frequency generated by the GPS CAM-SYNC which is, as described before, synchronized with the GPS PPS. In this way, the perfect simultaneity of the frames acquired by both cameras and its accurate synchronization with GPS time is guaranteed. Time precision of the used receiver board PPS is about 50 nanoseconds (as indicated by the manufacturer) and the same is expected for the trigger requests.


Sensor integration in a low cost land mobile mapping system.

Madeira S, Gonçalves JA, Bastos L - Sensors (Basel) (2012)

Image acquisition architecture.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376609&req=5

f9-sensors-12-02935: Image acquisition architecture.
Mentions: Cameras are connected to the laptop through a Firewire card port and the images are stored in JPEG format (a complete scheme is presented in Figure 9). It is necessary to get a precise time for each acquired image to precisely discriminate their position and attitude in the absolute reference system. The external trigger possibility offered by the cameras is used in conjunction with the frequency generated by the GPS CAM-SYNC which is, as described before, synchronized with the GPS PPS. In this way, the perfect simultaneity of the frames acquired by both cameras and its accurate synchronization with GPS time is guaranteed. Time precision of the used receiver board PPS is about 50 nanoseconds (as indicated by the manufacturer) and the same is expected for the trigger requests.

Bottom Line: Mobile mapping is a multidisciplinary technique which requires several dedicated equipment, calibration procedures that must be as rigorous as possible, time synchronization of all acquired data and software for data processing and extraction of additional information.To decrease the cost and complexity of Mobile Mapping Systems (MMS), the use of less expensive sensors and the simplification of procedures for calibration and data acquisition are mandatory features.The results discussed here show that this goal has been achieved.

View Article: PubMed Central - PubMed

Affiliation: Universidade de Tras-Os-Montes e Alto Douro, Vila Real, Portugal. smadeira@utad.pt

ABSTRACT
Mobile mapping is a multidisciplinary technique which requires several dedicated equipment, calibration procedures that must be as rigorous as possible, time synchronization of all acquired data and software for data processing and extraction of additional information. To decrease the cost and complexity of Mobile Mapping Systems (MMS), the use of less expensive sensors and the simplification of procedures for calibration and data acquisition are mandatory features. This article refers to the use of MMS technology, focusing on the main aspects that need to be addressed to guarantee proper data acquisition and describing the way those aspects were handled in a terrestrial MMS developed at the University of Porto. In this case the main aim was to implement a low cost system while maintaining good quality standards of the acquired georeferenced information. The results discussed here show that this goal has been achieved.

No MeSH data available.