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Multibeam EM712 is a high-resolution seafloor mapping system. It is suitable for water depths up to 2000m depending on the configuration of the transducers. Maximum ping rate is 30Hz and maximum fan width 140° 140° and depth resolution 1cm. Data from the water column may also be stored. |
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Transducer Frequency
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| 40 - 100 kHz||||
Contacts
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Position
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Data logging, storage and archiving
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| The GPS position of the Trimble GPS receiver antenna is stored in the data files. The position is NOT centralized to the SES2000 transducers. Heave correction between the motion sensor and the transducer are calculated in the motion sensor and corrected values are transferred to the SES2000. Time synchronisation is achieved via NTP. Centralization of the GPS position to the transducer is achieved by SIS software. GPS antenna position and transducer position related to the motion sensor position as a reference point are stored in the data files. Pay attention that in case of failure of the Trimble GPS sensor the Saab GPS sensor may be used as the reference GPS source. Please contact the bridge staff for information about the GPS receiver in use. Heave correction values are only available for the Trimble GPS receiver. Heave correction between the motion sensor and the transducer is calculated
in the EM712 transceiver unit. UTC time synchronisation of the transceiver unit is achieved via GPS with PPS. The PC is synchronised with UTC via the Windows-Domain-Affiliation to ensure a correct naming of the data files.||||
Rawdata storage on board
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The data acquisition software SIS creates raw data on the local drive of the computer. The EM712 data are not transferred to DSHIP. | ||
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|| root directory | E:\sisdata\raw\ or \\xdc\home\data\mbes\ ||
|| directory name | CruiseNo e.g. HE590 ||
|| file name | nnnn_YYYYMMDD_hhmmss_Suffix.all ||
|| Data volume (MB per day) ca | 2800 ||
|| Number of files per day ca | 50 || |
Dship
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| Only the water depths of the central beam are written to
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Data archiving on land
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After consultation with the data scientist and AWI Logistics the EM712 data including meta data may be transferred to PANGAEA (https://www.pangaea.de/). | ||
Documentation
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