Topography data from northern Monterey Bay, California, March 2015
Dates
Publication Date
2017
Start Date
2015-03-16
End Date
2015-03-20
Citation
Stevens, A.W., Logan, J.B., Snyder, A.G., Hoover, D.J., Barnard, P.L., Warrick, J.A., 2017, Beach topography and nearshore bathymetry of northern Monterey Bay, California: U.S. Geological Survey data release, https://doi.org/10.5066/F76H4GCW.
Summary
This portion of the USGS data release presents topography data collected during surveys performed along northern Monterey Bay, California, in March 2015 (USGS Field Activity Number 2015-625-FA). Topographic profiles were collected on foot with GNSS receivers mounted on backpacks. Prior to data collection, vertical distances between the GNSS antennas and the ground were measured using a tape measure. Hand-held data collectors were used to log raw data and display navigational information allowing surveyors to navigate survey lines spaced at 50- to 250-m intervals along the beach. Profiles were surveyed from the landward edge of the study area (either the base of a bluff, engineering structure, or just landward of the primary dune) over [...]
Summary
This portion of the USGS data release presents topography data collected during surveys performed along northern Monterey Bay, California, in March 2015 (USGS Field Activity Number 2015-625-FA). Topographic profiles were collected on foot with GNSS receivers mounted on backpacks. Prior to data collection, vertical distances between the GNSS antennas and the ground were measured using a tape measure. Hand-held data collectors were used to log raw data and display navigational information allowing surveyors to navigate survey lines spaced at 50- to 250-m intervals along the beach. Profiles were surveyed from the landward edge of the study area (either the base of a bluff, engineering structure, or just landward of the primary dune) over the beach foreshore, to wading depth on the same series of transects as nearshore bathymetric surveys that were conducted during the same time period. Additional topographic data were collected between survey lines with an all-terrain vehicle (ATV) to constrain the elevations and alongshore extent of major morphological features. Raw GNSS data were logged internally at 2-Hz intervals using a GNSS receiver mounted at a measured height above the ground.
Positioning data from the survey platforms were post-processed to apply differential corrections from a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983 (2011 realization). Post-processing of raw GNSS data was performed with Trimble Business Center and Waypoint Grafnav, for the backpack- and ATV- platforms, respectively. Orthometric elevations relative to the NAVD88 vertical datum were computed using National Geodetic Survey Geoid12a offsets.
The average estimated vertical uncertainty of the topographic measurements is 3 cm. The final point data are provided in comma-separated text format and are projected in Cartesian coordinates using the UTM Zone 10 North, meters coordinate system.
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mb15_mar_topo_metadata.xml Original FGDC Metadata
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mb15_mar_topo.csv
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Purpose
Data were obtained to document changes in shoreline position and coastal morphology as they relate to episodic (storms), seasonal, interannual, and longer (e.g. El Niño) processes. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify topographic and shallow-water bathymetric features.
