Triton Perspective - Manual (Page 99)

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Note that there is a drop-down list for 'Heave Ref.' with the following options depending on
the source of the data and where in the XTF file the information is stored:
When finished, select 'OK'. This will open a window for entering the name of the vessel
geometry file and selecting an output directory.
GSF: Include FTS when available.
All data is written internally to a standard GSF (Generic Sensor Format) file. FTS (Footprint
Time Series) data is beam imagery from within each beam footprint, sometimes called
'Snippets'. If the data contains this information then leaving the box checked will generate
both a DTM and imagery from the FTS data in the GSF file.