Andrew W. Stevens
Joshua B. Logan
Alexander G. Snyder
Daniel J. Hoover
2017
Digital elevation models (DEMs) of northern Monterey Bay, California, March 2017
Esri ARC/INFO ASCII GRID
data release
DOI:10.5066/F76H4GCW
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/F76H4GCW
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299
Andrew W. Stevens
Joshua B. Logan
Alexander G. Snyder
Daniel J. Hoover
Patrick L. Barnard
Jonathan A. Warrick
2017
Beach topography and nearshore bathymetry of northern Monterey Bay, California
data release
DOI:10.5066/F76H4GCW
Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/F76H4GCW
This part of the data release presents digital elevation models (DEMs) derived from bathymetry and topography data of northern Monterey Bay, California collected in March 2017. Bathymetry data were collected using two personal watercraft (PWCs), each equipped with single-beam echosounders and survey-grade global navigation satellite system (GNSS) receivers. Topography data were collected on foot with GNSS receivers mounted on backpacks and with an all-terrain vehicle (ATV) using a GNSS receiver mounted at a measured height above the ground. Additional topography data were collected with a terrestrial lidar scanner. DEM surfaces were produced from all available elevation data using linear interpolation.
Data were obtained to document changes in shoreline position and coastal morphology as they relate to episodic (storms), seasonal, interannual, and longer (for example, El NiƱo) 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.
Additional information about the field activities from which these data were derived are available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=2017-620-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
20170307
20170314
ground condition at time data were collected
Not planned
-122.025903
-121.787918
36.978825
36.807485
USGS Metadata Identifier
USGS:59fb458de4b0531197b16299
USGS Thesaurus
bathymetry
bathymetry measurement
topography
GPS measurement
LIDAR
digital elevation models
ISO 19115 Topic Category
elevation
Data Categories for Marine Planning
Bathymetry and Elevation
Marine Realms Information Bank (MRIB) keywords
single-beam echo sounder
topographic mapping
Global Positioning System (GPS) observations
coastal sediment budget
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Pacific Coastal and Marine Science Center
PCMSC
Global Change Master Directory (GCMD)
Water Depth
GPS (Global Positioning System)
Echo Sounders
Geographic Names Information System (GNIS)
Pacific Ocean
Monterey Bay
Monterey County
Santa Cruz County
none
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes.
Andrew W. Stevens
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Oceanographer
mailing and physical
2885 Mission St.
Santa Cruz
CA
95060
USA
831-460-7424
astevens@usgs.gov
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dems_overall.png&allowOpen=true
image map showing overview of digital elevation models (DEMs) of northern Monterey Bay, color-coded to show elevation
PNG
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dems_inset.png&allowOpen=true
four zoomed-in image maps showing digital elevation models (DEMs) for (A) Santa Cruz, (B) Soquel Cove, (C) Manresa, and (D) Moss Landing areas of northern Monterey Bay, color-coded to show elevation
PNG
Matlab version 9.2.0.556344 running on Microsoft Windows 7
International Hydrographic Organization (IHO)
2008
IHO standards for hydrographic surveys (5th ed.)
comma-delimited text
Monaco
International Hydrographic Bureau Special Publication 44, 28p.
https://www.iho.int/iho_pubs/standard/S-44_5E.pdf
Repeatability tests were conducted across different survey platforms, but no comparisons to "true" values were conducted.
All data falls within expected ranges.
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Digital elevation models (DEMs) are created by interpolating between elevation measurements as much as 500 meters apart, for this reason we cannot evaluate the accuracy of each point in a DEM, only the original data from which it is generated. The horizontal accuracy of the individual points was assessed based on the combined uncertainty of GNSS data points and terrestrial lidar data. Manufacturer-reported accuracy for the differentially corrected horizontal positions for the GNSS receivers used to collect the topographic and bathymetric measurements is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station varied between 1.5 km and 29 km with a mean of 13 km, suggesting the average horizontal accuracy of survey platform positions to be about 1.5 cm. The average uncertainty in the horiontal coordinates of the terrestrial lidar data is esimated to be 7 cm.
Digital elevation models (DEMs) are created by interpolating between elevation measurements as much as 500 meters apart, for this reason we cannot evaluate the accuracy of each point in a DEM, only the original data from which it is generated. An average estimated vertical accuracy of 3 cm for the topographic GNSS backpack- and ATV-survey platforms was estimated by using the manufacturer reported vertical accuracy of 1.5 cm + 1 ppm for differentially corrected kinematic data. The vertical accuracy of the terrestrial lidar data was tested by comparing the final elevation values to concurrently collected topographic GNSS data. The RMS errors calculated for the vertical differences between these data and the point cloud data were typically found to be less than or equal to about 7 cm. Uncertainty in the bathymetry data is related the precision of the GNSS positioning and single-beam echosounders as well as unmeasured variability in the speed of sound used to compute depths from bathymetric soundings. Based on analysis of available speed of sound measurements, we estimate uncertainties in the final depth soundings to be no greater than 1 percent of the water depth. The total vertical uncertainty of the bathymetry data is calculated using the constant- and depth-dependent factors summed in quadrature (International Hydrographic Organization, 2008). The average vertical uncertainty in bathymetry data is estimated to be 9 cm.
Andrew W. Stevens
Alexander G. Snyder
2017
Nearshore bathymetry data from northern Monterey Bay, California, March 2017
comma-delimited text
online
U.S. Geological Survey, Pacific Coastal and Marine Science Center
https://www.sciencebase.gov/catalog/file/get/59fb42a4e4b0531197b16273
digital dataset
20170309
20170314
ground condition at time data were collected
bathymetry data
Bathymetry data were combined with topography data, and then interpolated into a gridded surface
Andrew W. Stevens
Joshua B. Logan
Daniel J. Hoover
Alexander G. Snyder
2017
Topography data from northern Monterey Bay, California, March 2017
comma-delimited text
online
U.S. Geological Survey, Pacific Coastal and Marine Science Center
https://www.sciencebase.gov/catalog/file/get/59fb42bee4b0531197b16278
digital dataset
20170307
20170310
ground condition at time data were collected
topography data
Topography data were combined with bathymetry data, and then interpolated into a gridded surface
Joshua B. Logan
Alexander G. Snyder
2017
Terrestrial lidar data from northern Monterey Bay, California, March 2017
comma-delimited text
online
U.S. Geological Survey, Pacific Coastal and Marine Science Center
https://www.sciencebase.gov/catalog/file/get/59fb4571e4b0531197b16297
digital dataset
20170307
20170308
ground condition at time data were collected
terrestrial lidar data
Topography data were combined with bathymetry data, and then interpolated into a gridded surface
Quality control was applied to raw topography, terrestrial lidar, and bathymetry data. Comparisons were performed to ensure internal consistency between the survey platforms. DEMs were produced by linear interpolation of all available elevation point data with the computer program MATLAB. Data were exported in ESRI ARC ascii grid format for distribution.
bathymetry data, topography data, terrestrial lidar data
20171106
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
20201019
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Raster
Universal Transverse Mercator
10
0.9996
-123.0
0.0
500000.0
0.0
row and column
2
2
Meter
NAD83 (2011)
GRS_1980
6378137.0
298.257222101
North American Vertical Datum of 1988
0.001
meters
Explicit elevation coordinate included with horizontal coordinates
Attribute Table
Table containing attribute information associated with the dataset
Producer defined
Elevation (NAVD88)
Elevation relative to the North American vertical datum of 1988 (NAVD88)
Producer Defined
-12.750
7.664
meters
U.S. Geological Survey - Science Base
U.S. Geological Survey
mailing and physical
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
USA
1-888-275-8747
sciencebase@usgs.gov
DEM grids are available in Esri ARC/INFO ASCII GRID format (mb17_mar_dem_manresa.asc; mb17_mar_dem_mosslanding.asc; mb17_mar_dem_santacruz.asc; mb17_mar_dem_soquelcove.asc), along with low-resolution browse graphics showing the DEMs color-coded by elevation (mb17_mar_dems_overall.png; mb17_mar_dems_inset.png) and associated FGDC-compliant metadata.
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
png
Matlab 9.2.0.556344
PNG Image
PNG image showing individual digital elevation models of northern Monterey Bay in detail
none
2.0
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dems_inset.png
Data can be downloaded via the Internet
png
Matlab 9.2.0.556344
PNG Image
PNG image showing overview of digital elevation models of northern Monterey Bay
none
1.4
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dems_overall.png
Data can be downloaded via the Internet
ASCII
ArcGIS 10.1
Esri ARC/INFO ASCII GRID
Esri ASCII raster file containing digital elevation model of northern Monterey Bay, Manresa sub-area
none
98.9
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dem_manresa.asc
Data can be downloaded via the Internet
ASCII
ArcGIS 10.1
Esri ARC/INFO ASCII GRID
Esri ASCII raster file containing digital elevation model of northern Monterey Bay, Moss Landing sub-area
none
114.7
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dem_mosslanding.asc
Data can be downloaded via the Internet
ASCII
ArcGIS 10.1
Esri ARC/INFO ASCII GRID
Esri ASCII raster file containing digital elevation model of northern Monterey Bay, Santa Cruz sub-area
none
17.9
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dem_santacruz.asc
Data can be downloaded via the Internet
ASCII
ArcGIS 10.1
Esri ARC/INFO ASCII GRID
Esri ASCII raster file containing digital elevation model of northern Monterey Bay, Soquel Cove sub-area
none
28.6
https://www.sciencebase.gov/catalog/file/get/59fb458de4b0531197b16299?name=mb17_mar_dem_soquelcove.asc
Data can be downloaded via the Internet
None
20201019
Andrew W. Stevens
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Oceanographer
mailing and physical
2885 Mission St.
Santa Cruz
CA
95060
USA
831-460-7424
astevens@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998