| slopedeg_fm3- Nahant to Gloucester, Bathymetric Slope in degrees | |
|
Data format: Raster Dataset - ESRI GRID File or table name: slopedeg_fm3 Coordinate system: Universal Transverse Mercator Theme keywords: USGS, Bathymetry, Seafloor, Marine Geology, Swath Bathymetry, Interferometric Sonar, oceans and estuaries, elevation |
|
Abstract:
These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey, Coastal and Marine Geology Program. Woods Hole Science Center. Project data were collected during two separate surveys in the Fall of 2003 (RAFA03007) and the Spring of 2004 (RAFA04002).
Bathymetric data were collected with a SEA/Submetrix 2000 series interferometric 234 kHz sonar. The sonar was pole-mounted on the R/V Rafael. Survey line spacing was 100m |
|
Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey, Coastal and Marine Geology Program. Woods Hole Science Center. Project data were collected during two separate surveys in the Fall of 2003 (RAFA03007) and the Spring of 2004 (RAFA04002). Bathymetric data were collected with a SEA/Submetrix 2000 series interferometric 234 kHz sonar. The sonar was pole-mounted on the R/V Rafael. Survey line spacing was 100m
Swath bathymetry was collected over 127 kmē area covering a portion of the South Essex Ocean Sanctuary to characterize the surface and subsurface of the seafloor for regional geologic framework investigations. Bathymetric data were collected during two different surveys. Survey RAFA03007 began Monday, 22 Sep 03 (JD267) and ended on Tuesday, 14 Oct 03 (JD287). RAFA04002 began 17 Apr 04 (JD 108) and ended on 2 May 04 (JD123).
ground condition
Data are not intended for navigational use. 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.
384 Woods Hole Rd.
USGS, Coastal and Marine Geology Program
These data have not been compared to previous hydrographic data, although they generally agree with qualitative comparison of published NOAA charts.
Depths were collected using real-time kinematic differential global positioning system (RTK/DGPS) and referenced to mean sea level. Vertical datum was changed to mean lower low water during final gridding.
Soundings we collected with the SEA Submetrix 2000 aquisition software and exported to a .sxr file format
.sxr files were unravel using LINUX-based scripts and Swathed from University of New Brunswick's Ocean Mapping Group. Data were reviewd line by line and any bad soundings were removed.
Soundings data were gridded using the weigh_grid routines from Swathed. Soundings were corrected to mean lower low water during the weigh_grid operation using the real time kinematic differential Global positioning navigation files. The final weigh_grid paramaters used were: weigh_grid -omg -coeffs -butter -lambda 5 -cutoff 20 Max_incidence angle was not used in most lines to use all of the swath. Only lines from rough days or big heave were gridded with a small incidence angle to maximize the good data from adjacent lanes and reduce the bad data.
384 Woods Hole Rd.