Output clipped traces as null traces: Selecting this option will still import the entire data file, however traces that have been clipped will be written as traces where all the samples have zero values.

Don't output clipped traces: Selecting this option will prevent any clipped traces from being written to the resulting output file. 

Polygons: Click to open the Constraining Polygon dialog to use a polygon to clip the seismic line by a geographical area.

Note: We cannot handle 3D datasets that have holes in them.  You will need to select Output clipped traces as null traces to import these files.

Source Coordinate System:Select the coordinate system of the input seismic by clicking on the "..." button.  By default this is set to the coordinate system in the project properties dialog.  If you have obtained files with a different coordinate system from that of your project (such as a neighboring UTM zone) you can set this value to automatically convert the files to the project's coordinate system.

If you do not have a coordinate system defined for the project this area will initially be blank.

Destination Coordinate System: Select a coordinate system for the loaded seismic by clicking on the "..." button.  By default this is set to the coordinate system in the project properties dialog.  It is best to set this in the project properties rather than in this dialog.

If you do not have a coordinate system defined for the project this area will initially be blank. When converting between coordinate systems you need to set both the source and destination coordinate systems.

Add to working set: Make the loaded files members of the working set.  Normally you will set this to true, but sometimes you may not wish to override your currently defined working set. 

Note: If this is the first file for a given line (i.e. there is no working set defined for this line) the file will become a member of the working set even if this option is turned off.

Compress output SEG-Y files: Setting this option directs the operating system to write the file to disk as a compressed file.  Use this to save disk space.  Not all operating systems support compression so when writing to a network drive this option may be ignored.

Reverse bytes for output files (Unix format): Most Unix systems expect files to be stored with the opposite byte order, so if you intend to use the files on a Unix system you may want to check this option.  PC files are typically stored in "Little Endian" format while traditional Unix systems store files in "Big Endian" format.  We can read either format of file.