The spreadsheet in the scanned PDF (2011-015-FA_logbook_scanned.pdf) contains the following columns that are relevant to the sampling survey for field activity 2011-015-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 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 (2011 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 (sequentially beginning at DVD1/DV-1).
sample: This was marked as y (yes) or n (no) to indicate if a sediment sample collection was successful.
still_no: [THIS FIELD WAS NOT CONSISTENTLY USED] During the first two survey days, this field was used to estimate the number of still photographs taken at each sampling site.
Hypack file: [THIS FIELD WAS NOT USED]
comment: Additional comments about data acquisition for all systems used during USGS field activity 2011-015-FA. This 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 2011-015-FA_samples.shp available from the larger work citation).
[Unlabeled Column]: An extra column contains some notes typed in the original Excel log, usually pertaining to watch changes and equipment issues. This space has many handwritten notes in the scanned logbook, often related to post-processing that was done to calculate any time offset between the Global Positioning System (GPS) UTC time and the camera time for the photos.
Not all of the fields in the logbook were used. Although some notes and updates were made to the logbook, additional errors in the log-keeping may exist that have not been corrected. The cleaned-up version of the logbook (2011-015-FA_logbook_clean.pdf) has the same column headings as described above for the scanned version except where otherwise noted.