Keyword File: Select a previously defined keyword file that contains the required keyword definitions.

Scan Headers: Load the files into the SEG-Y Viewer.  The SEG-Y Viewer is a tool that allows you to examine the headers of the SEG-Y files and define the required keywords.

Automatically detect keyword files (one per input file): When this is turned on, the Data Loader will automatically check for a keyword file (.kwd) that matched the input SEG-Y (*.sgy) file and use it. For example, if loading Line1.sgy, there should be a Line1.kwd file in the same folder location for this feature to work. You will not have to specify the Keyword file above. 

Interpolate null shotpoints: When set to Yes any shotpoint values that are set to null (zero) will be interpolated based on the neighboring values in the header.  It is very common for SEG-Y files to have every second shotpoint set to null so it is recommended that this value be set to Yes.  When set to No the shotpoints will be loaded exactly as found in the original source files.

Interpolate null coordinates: When set to Yes any location coordinates that are set to null (zero) will be interpolated based on the neighboring values in the header.  When set to No the location coordinates will be loaded exactly as found in the original source files.  Normally if the location values are contained in the headers they will be defined for all traces, so the default value is No.