The spreadsheet contains the following columns that are relevant to the sampling survey for field activity 2012-035-FA:
JD (Julian day), station number, time in Coordinated Universal Time (UTC), depth in feet, DVD time, DVD number, tape number, sample, still number, Hypack file, comment. Within the spreadsheet, the first several rows of the comment column describe the acquisition equipment.
The definitions of the columns of data are as follows:
JD: Julian day based on UTC time; Julian day is the integer number representing the interval of time in days since January 1 of the year (2012 for these data).
Sta#: sampling site number or name
time_UTC: time in UTC
depth_ft: approximate depth in feet as reported by the ship's crew
DVD time: [THIS FIELD WAS NOT USED]
DVD# and Tape#: These fields indicate when a new DVD or Digital8 (Digital Video - DV) tape was started and the DVD or tape number (these fields were not used the first couple days, so they sequentially begin at DVD-04/DV-04).
sample: This field was marked as Y (yes) or N (no) to indicate if a sediment sample collection was successful. Please note that N was used inconsistently and this field was occasionally left blank when a sediment sample was not successfully collected.
still_no: [THIS FIELD WAS NOT USED]
Hypack file: [THIS FIELD WAS NOT USED]
comment: Additional comments about data acquisition for all systems used during USGS field activity 2012-035-FA. VOB stands for vehicle (sampler) on bottom and VOFFB stands for vehicle off bottom. This field often includes a qualitative visual observation of the sediment that was collected. This observation should not be used; please refer to the sediment sample dataset for laboratory analyses (see shapefile 2012-035-FA_samples.shp available from the larger work citation).
[Unlabeled Column]: An extra column (L) contains some notes typed in the original Excel log, usually pertaining to watch changes and equipment issues.
Not all of the fields in the logbook were used. Errors in the log keeping may exist that have not been corrected.