Metadata: Identification_Information: Citation: Citation_Information: Originator: Peter Dartnell Originator: David P. Finlayson Originator: Jonathan A. Warrick Publication_Date: 2020 Title: Bathymetry data collected in 2008 offshore Tijuana River Estuary, California during USGS Field Activity S-5-08-SC Geospatial_Data_Presentation_Form: GeoTIFF Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9Y8CDFI Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9Y8CDFI Online_Linkage: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9Y8CDFI/dataset/8/ Larger_Work_Citation: Citation_Information: Originator: Peter Dartnell Originator: David P. Finlayson Originator: Jonathan A. Warrick Publication_Date: 2020 Title: Bathymetry and acoustic backscatter data collected in 2008 offshore Tijuana River Estuary, California during USGS Field Activity S-5-08-SC Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9Y8CDFI Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9Y8CDFI Description: Abstract: These metadata describe bathymetry data collected during a 2008 SWATHPlus-M survey offshore Tijuana River Estuary, California. Data were collected and processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) with fieldwork activity number S-5-08-SC. The bathymetry data are provided as GeoTIFF images in UTM, zone 11, NAD83 coordinates, vertically referenced to both NAVD88 and WGS84. A standard deviation grid is also provided. Purpose: Coastal mapping was conducted as part of the Tijuana Estuary Fine Sediment Fate and Transport Demonstration Project, which was developed by a number of State of California, Federal, and private industry partners to provide information about the directions, rates, and processes of fine sediment transport at nearshore settings of California. The primary goal of the Demonstration Project was the monitoring of the transport, fate, and impacts of fine sediment from beach sediment nourishments in 2008 and 2009 near the Tijuana River Estuary, Imperial Beach, California. To achieve this goal, the USGS monitored the water, beach, and seafloor properties near the project site. The coastal mapping described in this report provided important baseline bathymetric and seafloor substrate information for the Demonstration Project and was used to develop sampling programs for the Demonstration Project. 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 bathymetric features. These data are not intended to be used for navigation. Supplemental_Information: Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=S508SC Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20080428 Ending_Date: 20080507 Currentness_Reference: ground condition at time data were collected. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.179 East_Bounding_Coordinate: -123.126 North_Bounding_Coordinate: 32.580 South_Bounding_Coordinate: 32.534 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5af2a590-f9c4-4cb1-aadb-0af323bb13b1 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: bathymetry Theme_Keyword: bathymetry measurement Theme_Keyword: sea-floor characteristics Theme_Keyword: geospatial datasets Theme_Keyword: marine geophysics Theme_Keyword: sonar methods Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Bathymetry and Elevation Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: field observation Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Pacific Ocean Place_Keyword: State of California Place_Keyword: Imperial Beach Place_Keyword: Tijuana River National Estuarine Research Reserve Access_Constraints: none Use_Constraints: 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 originators of the dataset and in products derived from these data. This information is not intended for navigation purposes. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9Y8CDFI/5c5c3b573f2644f3945fbc1aaffdbec1/Tijuana_bathy_QV.jpg Browse_Graphic_File_Description: Quick view image of the Tijuana River Delta bathymetry data. Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Caris HIPS and SIPS (version 7.1.1 Service Pack 3) and ArcMap (ver. 10.3.1) on a Windows 7 computer. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The SWATHPlus-M sonar system (234 kHz) depth accuracy reduces with horizontal range. The system has an estimated vertical depth uncertainty ranging from about 0.05 m to 0.30 m over a horizontal range of 0 to 90 m (https://www.iter-systems.com/wp-content/uploads/2020/03/ETD_2002_Bathyswath-2_Tech-info_EN.pdf). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations. Logical_Consistency_Report: No formal logical accuracy tests were conducted Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Uncertainty in the horizontal position of each sounding is a function of the total uncertainty propagated through each of the following component instruments: 1) base station GPS, 2) vessel GPS, 3) intertial motion unit (IMU), 4) water sound velocity model, and 5) beam spreading in the water column. Assuming no systematic errors in the measurement instruments themselves, beam spreading is the dominate source of positional uncertainty. The 1-degree sonar beam of the SWATHplus-M results in horizontal uncertainty ranging from 0.10 m at 10 m slant range, to about 0.45 m at 50 m slant range. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: After filtering the data to remove obvious outliers, the standard deviation of the remaining sounding elevations was calculated for each 1 m x 1 m cell in CARIS. The mean standard deviation for all cells in the survey is 0.12 m and 95% of the cells in the data set have a standard deviation of less than 0.30 m. Lineage: Process_Step: Process_Description: Sonar Data Collection - The bathymetric surveys were conducted using a 234.5 kHz SEA (Systems Engineering & Assessment Ltd) SWATHplus-M phase-differencing sidescan sonar. The sonar was pole-mounted on the 34-foot USGS mapping vessel R/V Parke Snavely, and affixed to a hull brace. Real-time kinematic (RTK) GPS position data were passed through a CodaOctopus F180 intertial measurement unit (IMU) to the sonar hardware and data collection software. Sonar heads, GPS antennae, and the IMU were surveyed in place to a common reference frame with a Geodimeter 640 Total Station. The R/V Snavely was outfitted with three networked workstations and a navigation computer for use by the captain and survey crew for data collection and initial processing. Process_Date: 20080429 Process_Step: Process_Description: Geodetic Control - Geodetic control for the survey was established using a shore based Global Positioning System (GPS) base station broadcasting Real Time Kinematic (RTK) corrections to the survey vessel via UHF radio link. The base station was located at atop the Tijuana River National Estuarine Reserve Visitor Center. The base station was programmed using the NAD83 (CORS96) reference frame with an Epoch of 2002.0000. Average Opus Solution coordinates for the station are: > >Reference Frame: NAD83 (CORS96) >Epoch: 2002.0000 >Latitude: N 32D 34' 29.10834" >Longitude: W 117D 7' 36.23523" >Ellipsoid Height: -25.765 m >Orthometric Height: 9.583 m (Geoid09) >UTM Zone 11 Northing: 3604152.632 m >UTM Zone 11 Easting: 488104.754 m > >Reference Frame: WGS84 (G1150) >Epoch: 2008.3246 >Latitude: N 32D 34' 29.12697" >Longitude: W 117D 7' 36.29008" >Ellipsoid Height: -26.526 m Process_Date: 20080429 Process_Step: Process_Description: Vessel Position and Attitude - The R/V Snavely was equipped with a CodaOctopus F180 attitude and positioning system for the duration of the survey. The F180receives real-time kinematic (RTK) corrections directly. The RTK GPS data (2 cm error ellipse) are combined with the inertial motion measurements directly within the F180 hardware so that high-precision position and attitude corrections are fed in real-time to the sonar acquisition equipment. The NAD83 (CORS96) Epoch 2002.0000 3-dimensional reference frame was used for all data acquisition. Process_Date: 20080429 Process_Step: Process_Description: Sound Velocity Measurements - Sound velocity measurements were collected continuously with an Applied Micro Systems Micro SV deployed on the transducer frame for real-time sound velocity adjustments at the transducer-water interface. The Micro SV is accurate to +/- 0.03 m/s. In addition, sound velocity profiles (SVP) were collected with an Applied Micro Systems, SvPlus 3472. This instrument provides time-of-flight sound-velocity measurements by using invar rods with a sound-velocity accuracy of about 0.06 m/s, pressure measured by a semiconductor bridge strain gauge to an accuracy of 0.15 percent (Full Scale) and temperature measured by thermistor to an accuracy of 0.05 degrees Celsius (Applied Microsystems Ltd., 2005). Process_Date: 20080429 Process_Step: Process_Description: Sonar Sounding Processing - GPS data and measurements of vessel motion were combined in the F180 hardware to produce a high-precision vessel attitude packet. This packet was transmitted to the Swath Processor acquisition software in real time and combined with instantaneous sound velocity measurements at the transducer head before each ping. As many as 20 pings per second were transmitted with each ping consisting of 2,048 samples per side (port and starboard). The returned samples were projected to the seafloor using a ray-tracing algorithm working with the previously measured sound-velocity profiles in SEA Swath Processor (version 3.07.12.0). A series of statistical filters were applied to the raw samples that isolated the seafloor returns from other spurious targets in the water column. Finally, the processed data is stored line-by-line in both raw (.sxr) and processed (.sxp) trackline files. Processed (.sxp) files were further processed with SXPEGN (build 151) by David Finlayson (USGS) to remove erroneous data from the files and produce valid gain-normalized amplitude data for processing backscatter data. Process_Date: 20111207 Process_Step: Process_Description: Digital Elevation Model Production - The digital elevation model (DEM) produced in this work was derived solely from the bathymetric data collected by the USGS during field activity S-5-08-SC. CARIS HIPS and SIPS (version 7.1.1 Service Pack 3) bathymetry processing software was used to clean and bin the raw bathymetry. Processed .sxp files were imported to CARIS, and a field sheet was created within CARIS to encompass the survey area. Survey lines were filtered to remove adjacent line data from nadir gaps. A CARIS Swath Angle BASE (bathymetry with associated statistical error) surface was created at 1-m resolution and the subset editor was used to clean artifacts and other unwanted soundings. The binned data were exported as an ASCII table along with calculations of the bin standard deviation (of all soundings within the 1 m x 1 m cell spacing) and the sounding density. The data was transformed from the NAD83 ellipsoid to the WGS84 (G1150) ellipsoid using a 14-point Helmert transformation using the parameterization described in Soler and Snay (2004) with the command line tool CS2CS (in inverse mode) in the Proj4 library (http://trac.osgeo.org/proj/). The parameters were calculated for an Epoch date of 2008.3246 as shown in table 3. The conversion from NAD83 (CORS96) to WGS84 (G1150)/ITRF2000 shifts the data about 0.97 m to the west, 0.68 m to the north, and 0.77 m in elevation. At the base station, the NAD83 ellipsoid height was -25.765 m and the orthometric height based on Geoid09 (National Geodetic Survey, 2009) was 9.583 m, representing a vertical offset of -35.348 m between the NAD83 ellipsoid heights and NAVD88 altitudes. This static offset was applied to the each of the soundings to convert the NAD83 (CORS96) ellipsoid elevations into NAVD88 altitudes. Finally, the ASCII data were gridded in Surfer (Version 10.3) at 1 m resolution using the IDW algorithm with a 3 m search radius and a smoothing parameter set to 0.5. This process filled small gaps in the surface and provided some minor smoothing to reduce the statistical noise inherent in interferometric bathymetry measurements. This resulting surface was converted to ESRI ASCII grid format Process_Date: 20111207 Process_Step: Process_Description: Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Process_Date: 20201019 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: Corrected working URL links to cmgds data repository to the actual published links Process_Date: 20210317 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Susan A. Cochran Contact_Position: Geologist Contact_Address: Address_Type: Mailing and Physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7545 Contact_Electronic_Mail_Address: scochran@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 5202 Column_Count: 4991 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -117 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 1.0 Ordinate_Resolution: 1.0 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 (CORS96) and World Geodetic System of 1984 Ellipsoid_Name: Geodetic Reference System 80 and WGS84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum 1988 (NAVD-88) and WGS84 ellipsoid Altitude_Resolution: 0.01 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: value Entity_Type_Definition: depth in meters relative to NAVD-88 and WGS84 ellipsoid Entity_Type_Definition_Source: Producer defined Overview_Description: Entity_and_Attribute_Overview: The complete 2008 1-m resolution grid "S-5-08-SC_bathy_navd88_utm11_1m.tif" was originally archived as a TIFF image with the following attributes. >Cell size = 1.0 >Number of rows = 5202 >Number of columns = 4991 > >Data type = floating point > >Boundary >Xmin = 483181 >Xmax = 488172 >Ymin = 3599601 >Ymax = 3604803 > >Statistics >Minimum value = -30.7 >Maximum value = -3.3 >Mean = -15.8 >Standard deviation = 5.68 > >Coordinate system description >Projection UTM >Zone 10 >Datum NAD83 >Vertical Reference NAVD88 >Units meter The complete 2008 1-m resolution grid "S-5-08-SC_bathy_wgs84_utm11_1m.tif" was originally archived as a TIFF image with the following attributes. >Cell size = 1.0 >Number of rows = 5202 >Number of columns = 4991 > >Data type = floating point > >Boundary >Xmin = 483181 >Xmax = 488172 >Ymin = 3599601 >Ymax = 3604803 > >Statistics >Minimum value = -66.8 >Maximum value = -39.4 >Mean = -51.9 >Standard deviation = 5.67 > >Coordinate system description >Projection UTM >Zone 10 >Datum WGS84 >Vertical Reference WGS84 >Units meter The complete 2008 1-m resolution grid "S-5-08-SC_bathy_stddev_nad83_utm11_1m.tif" was originally archived as a TIFF image with the following attributes. >Cell size = 1.0 >Number of rows = 5202 >Number of columns = 4991 > >Data type = floating point > >Boundary >Xmin = 483181 >Xmax = 488172 >Ymin = 3599601 >Ymax = 3604803 > >Statistics >Minimum value = 0 >Maximum value = 6.69 >Mean = 0.12 >Standard deviation = 0.09 > >Coordinate system description >Projection UTM >Zone 10 >Datum NAD83 >Units meter Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: Mailing and Physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 1-888-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: These data are available in GeoTIFF format, including a tif world file (.tfw) and CSDGM FGDC-compliant metadata. Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: GeoTIFF Format_Version_Number: ArcMap (version 10.3.1) Format_Information_Content: Downloadable zip file contains the TIFF (.tif) version of the bathymetry data and a projection file (.tfw). File_Decompression_Technique: WinZip Transfer_Size: 40.4 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9Y8CDFI/afa032db081f4f19bfbd21ec8dec1cb3/S-5-08-SC_bathymetry_navd88_utm11_1m.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9Y8CDFI/c71d0bf48fca47d6b0a74c7d9744b97b/S-5-08-SC_bathymetry_wgs84_utm11_1m.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9Y8CDFI/6cd825f7de024c6a9fe03b0e18573c01/S-5-08-SC_bathy_stddev_nad83_utm11_1m.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9Y8CDFI/dataset/8/ Network_Resource_Name: https://doi.org/10.5066/P9Y8CDFI Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of navd88 bathymetry data (40.4 MB). The second link is a direct link to download the zipped file of wgs84 bathymetry data (37.6 MB). The third link is a direct link to download the zipped file of nad83 bathymetry standard deviation data (20.9 MB). The fourth link points to a landing page with all of the bathymetry data images, metadata, and a browse image. The fifth link points to the landing page for the entire data release, including links to pages of the various data files. Fees: None. Technical_Prerequisites: The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a GeoTIFF file. Metadata_Reference_Information: Metadata_Date: 20210317 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998