| OpendTect dGB Plugins User Documentation version 4.2 |
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Most of the processing in the Velocity Model Building Plugin will not require data import and export:
Pre and Post stack images may be read from the processing software (Ethos), via the function SEG-Y in place or from loaded OpendTect format at wish.
The velocity volumes are build and remain in OpendTect, such as the picked mute definitions, RMO and tomography events.
Nevertheless, for convenience it is possible to export the volumes to SEG-Y files and the mute definition and pre-stack events to text files (ASCII). Please refer to the base documentation for the export of volumes and mute definitions.
The export menu enables exporting of picked pre-stack events to text (ASCII) files. The output file will be column-sorted with one row per pick. The following data will be found is each column:
Inline
Crossline
Event index (0-N)
Dip, going to increasing inlines. 0 is written if dip is not available.
Dip, going to increasing crosslines. 0 is written if dip is not available.
Event quality, 0-255 (higher is better)
Azimuth (0-2PI)
Offset
Depth
Pick quality, 0-255 (higher is better).
The dip comes either from a horizon (if the event is picked from an horizon) or from the SteeringCube. The pick quality is determined while tracking depending on the strengths of the event and how well the individual pick fits the rest.