This dataset includes all of the swath-bathymetry trackline navigation that was processed for USGS field activity 2013-003-FA. On a case by case basis, some of the swath-bathymetric data may not have been processed and therefore no trackline was created (e.g. if a line was stopped for various reasons and a new line was restarted covering the same area of the original survey line). Although this shapefile includes trackline navigation from all processed swath bathymetric data, only quality sonar data along the main survey lines were included in the final bathymetry grid (2013-003-FA_Bath5m_MLLW.tif) found in this report. Noisy or poor quality data were not included in the grid. Data from some survey lines were omitted where they overlapped with equal or better quality data from adjacent lines (as was the case for the few lines that were less than several hundred meters long). Data along tie and transit lines were generally not included in the final grid either. An approximately 24 square kilometer area offshore of Edgartown Great Pond (south of Martha's Vineyard, MA) was not surveyed because it was surveyed in 2007 using the same system as part of a separate project to study the area around Woods Hole Oceanographic Institution (WHOI) Martha's Vineyard Coastal Observatory (MVCO), see USGS Open File Report 2008-1288 for more information https://pubs.usgs.gov/of/2008/1288/. Line L87 (which was a re-occupation of L1F1) was not recorded due to an equipment error. Time gaps occurred during this field activity where no surveying was done due to bad weather, rough seas and stops in port for crew changes. Planned surveying was paused and no main survey line data were collected during these times:
JD143 15:20 - JD146 20:06 (no data were collected on JD144 or JD145)
JD149 15:40 - JD151 18:59 (no data were collected on JD150)
JD153 00:01 - JD153 14:32
JD155 18:16 - JD156 02:06
JD158 06:12 - JD160 19:15 (no data were collected on JD159)