Field Activity 2015-642-FA

Identifier 2015-642-FA
Purpose Baseline Topographic and Bathymetric survey of Little Holland Tract
Location Rio Vista, CA Little Holland Tract, Sacramento River Delta
Summary A. Stevens submitted base, bathy, photos, svp, and topo with readme file 6/12/15. A. Snyder submitted gis folder to FAD 9/28/2015
Info derived Combined topographic/bathymetric map of Little Holland Tract.
Comments First day in field is for topographic surveys and to recon for appropriate bathy survey vessel. Follow-up field days to finish topo and bathy
Fast Eddy (SC)
Boston Whaler 21 foot
Waverunner 1 (SC)
Personal Water Craft
Waverunner 2 (SC)
Personal Water Craft
San Lorenzo
Length: 26 feet. Built in 1999 by Radon.
MarFac; Chevy Suburban - gray; 7 pass; G62-2874L
Start Rio Vista, CA 2015-05-22
End Rio Vista, CA 2015-07-31
Days in the field 3-5
West -121.708
East -121.63314819
North 38.39226254
South 38.26247087


2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
Principal investigators Jessica R Lacy
Crew members
Andrew Stevens
Scientist, Staff
Timothy C Elfers
Scientist, Staff
Cordell Johnson
Scientist, Staff
Alexander G Snyder
Scientist, Staff
Information specialist(s)
Jessica R Lacy
Specialist, Information

Data types and categories

Data category: Location-Elevation, Sonar
Data type: Navigation, Transects, Single Beam

Equipment used

Equipment Usage description Data types Datasets
Trimble R7 GPS (AS) Benchmarks, Navigation, Profiles, Transects 2
Waverunners Navigation, Single Beam 2


Datasets produced in this activity

Dataset name Equipment Description Dataset contact
Digital elevation model of Little Holland Tract, Sacramento-San Joaquin Delta, California, 2015 Trimble R7 GPS (AS) This product is a digital elevation model (DEM) for the Little Holland Tract in the Sacramento-San Joaquin River Delta, California based on U.S. Geological Survey (USGS)-collected elevation data, merged with existing topographic and bathymetric elevation data. The USGS collected topographic and bathymetric elevation data in 2015, using a combination of methods. Topographic and shallow-water bathymetric data were collected on foot using a global positioning system (GPS) backpack platform that consisted of survey-grade Trimble R10, and Trimble R7 global navigation satellite system (GNSS) receivers with Zephyr 2 antennas. Bathymetric data were collected using a personal watercraft (PWC) platform that consisted of Trimble R7 GNSS receivers with Zephyr 2 antennas, combined with Odom Echotrac CV-100 single-beam echosounders and 200 kHz transducers. The USGS elevation data were merged with topographic aerial Light Detection and Ranging (lidar) data collected by California Department of Water Resources (DWR) in 2007 and single-beam bathymetric data collected by Environmental Data Solutions (EDS) in 2009 to generate the final DEM. The GeoTIFF raster and comma-delimited text files are available for download at Alexander G Snyder
topo data Trimble R7 GPS (AS) published in Science Base, U.S. Geological Survey data release, DOI: 10.5066/F7RX9954 Alexander G Snyder
bathy data Waverunners published in Science Base; U.S. Geological Survey data release, DOI: 10.5066/F7RX9954 Alexander G Snyder

Datasets compiled from multiple sources

Dataset name Equipment Description Dataset contact
Digital elevation model (DEM) of the Cache Slough Complex, Sacramento-San Joaquin Delta, California Waverunners This metadata describes a digital elevation model (DEM) created from bathymetric and topographic data collected between 2004 and 2019 in the Cache Slough Complex (CSC), northern Sacramento-San Joaquin Delta, California. We merged the newly collected bathymetric and topographic data presented in this data release (DOI:10.5066/P9AQSRVH) with 2019 surveys by the California Department of Water Resources (DWR), 2017 USGS Sacramento Delta Lidar, and 2004 bathymetry data from the Army Corp of Engineers. Small gaps of missing data were filled with existing DWR/USGS Delta DEMs to produce a seamless DEM of the Cache Slough Complex with a grid resolution of 1 m. Remaining gaps in the DEM are areas where there is currently no available data. Theresa Fregoso


Samples collected during this field activity