Note: These data were converted from their native projection to the Massachusetts State Plane coordinate system, Mainland Zone (Fipszone 2001), meters by the Massachusetts Department of Coastal Zone Management on Oct. 19, 2006.
These data should not be used at resolutions for which it is not intended.
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS), as the source of this information.
The NOAA acquisition vessels were also equipped with Odom Echotrac DF3200 MKII echosounders that logged high-frequency (100 kHz) vertical-beam soundings concurrently throughout the sidescan sonar and multibeam bathymetry surveying operations. Vertical-beam soundings were recorded in Hypack raw format and later converted to CARIS HDCS format. The NOAA Office of Coast Survey cleaned and merged the data and performed tide corrections using CARIS HIPS.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.