However it is the position of 'center of guns' at each predefined shot-point that is needed. Steered NodeĪccording to the UKOOA P2/94 format description the 'Start Of Line' is defined as the planned position of the vessel reference point at the first shot of the line. Otherwise the link will not work because it has two depths associated with it. Depths at Streamer LinksĪssuming depth sensors have been defined for the forward and aft ends of each streamer section, be aware that at link points, only one depth sensor can be enabled.įor example, if the depth sensor at the aft end of streamer Section 1 has been enabled, the depth sensor at the forward end of Section 2 must be disabled. If 'Use Z' is disabled, the computation uses the ROV Depth observation instead. If 'Use Z' is enabled, the dZ value from the layback will determine the height of the towed object. Otherwise height conflict messages will pop up. If one or more #Manual Layback (dX dY dZ) systems are being used, pay particular attention to the 'Use Z' parameter, especially when an 'ROV Depth' observation has been defined for the layback object. Pay attention to: Manual Layback Settings Of course it is important to check that all the appropriate objects and systems are enabled, including the 'dummy' echosounders defined for each object in the spread (see DbSetup - Setup for Towed Streamer Seismic -Other Systems). In general, settings are similar to any other type of survey as described in F1 inline Help 'Controller~Settings~ComputationSetup'. Please refer to other QINSy documentation for additional data acquisition issues. The information below only addresses those aspects of Online Data Acquisition that pertain directly to towed streamer seismic, including sub-bottom profiling when source and streamer are separate objects.
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