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The GEM Mod. GSM-19D was used. The towfish was kept 200 m off the stern. The data was collected by the NAVMAP workstation along the multibeam lines, including some diagonal lines, as dictated by multibeam coverage.
The following data processing steps were applied:
- extraction of the navigation and total field ASCII data from the NAVMAP data files
- polar transport (240 m distance, angle (hdg-180)) to get the towfish position
- application of the IGRF to every point
2008-01-01