220 User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN
220 Innomar Technologie GmbH (2023-01)
Checklist Data Processing
ISE Data Cleaning
This should be done immediately after the survey, even if the data will be later converted into
SEG-Y data format and processed using third-party software:
Check GNSS position data for outliers and clean if necessary.
Interpolate GNSS position data and time stamps to have unique position/time for each ping.
Check motion sensor data.
Convert position data to required datum, if not done online.
Check if antenna offsets were correctly applied. If not, re-process position data.
Check motion sensor lever arm correction. If there is still a large heave visible in the data
after heave correction, usually lever arms were not correctly set up. In this case find suitable
values and re-process heave data.
Check tide data.
ISE Data Post-Processing
Get a clean HF bottom track and store as layer file or write back to data file.
Find suitable settings for the “Load file” dialogue which fits the processing requirements of
the LF data:
o Stacking / Smoothing
o Thresholds
o Colours
o Signal Processing: Filter / Algorithm
o SIS-IDs for GNSS position data
o Locate tide file if needed
o Set sample rate reduction where suitable
o Usually enable “Heave Correction” and “Median Filter”
Pick sediment layers as required
Pick positions of buried objects as required
Export picked XYZ data as required
Export echo plots as graphic files for QA
SEG-Y / XTF Data Export
If required export data to SEG-Y or XTF format for third-party processing:
Set correct SIS-IDs for GNSS position data and time stamp
Set coordinate scale factor (100 for metric position data)
Set byte order (usually “Motorola”)
Set heave correction and sample rate reduction as required
Check/set range processing parameters
Set trace number generation
Export sample data files and ensure these can be opened and processed by the target
processing software
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