Contours--Offshore Refugio Beach, California

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Andrew C. Ritchie

Originator: Peter Dartnell

Originator: Rikk G. Kvitek

Originator: Samuel Y. Johnson

Publication_Date: 2015

Title: Contours--Offshore Refugio Beach, California

Edition: 1.0

Geospatial_Data_Presentation_Form: Vector digital data

Larger_Work_Citation:

Citation_Information:

Originator: Samuel Y. Johnson

Originator: Peter Dartnell

Originator: Guy R. Cochrane

Originator: Nadine E. Golden

Originator: Eleyne L. Phillips

Originator: Andrew C. Ritchie

Originator: Lisa M. Krigsman

Originator: Bryan E. Dieter

Originator: James E. Conrad

Originator: H. Gary Greene

Originator: Gordon G. Seitz

Originator: Charles A. Endris

Originator: Ray W. Sliter

Originator: Florence L. Wong

Originator: Mercedes D. Erdey

Originator: Carlos I. Gutierrez

Originator: Mary M. Yoklavich

Originator: Amy E. Draut

Originator: Patrick E. Hart

Publication_Date: 2015

Title:

California State Waters Map Series--Offshore of Refugio Beach Area, California

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: Scientific Investigations Map

Issue_Identification: SIM 3319

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Online_Linkage: <https://pubs.usgs.gov/sim/3319/>

Online_Linkage: <https://dx.doi.org/10.3133/sim3319>

Larger_Work_Citation:

Citation_Information:

Originator: Nadine E. Golden

Publication_Date: 2013

Title: California State Waters Map Series Data Catalog

Geospatial_Data_Presentation_Form: database

Series_Information:

Series_Name: Data Series

Issue_Identification: DS 781

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Online_Linkage: <https://pubs.usgs.gov/ds/781/>

Description:

Abstract:

This part of SIM 3319 presents bathymetric contours for several seafloor maps of Offshore Refugio Beach, California (vector data file is included in "Contours_OffshoreRefugioBeach.zip," which is accessible from <http://pubs.usgs.ov/ds/781/OffshoreRefugioBeach/data_catalog_OffshoreRefugioBeach.html>). Contours of Offshore Refugio Beach, California, were clipped from a larger overall contour dataset of all California State Waters within the Santa Barbara Channel. These contours were generated from bathymetry data collected by the U.S. Geological Survey (USGS), by California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB), and by Fugro Pelagos. The USGS conducted mapping within State waters in the summers of 2005, 2006, 2007, and 2008 using a combination of 117 kHz and 234.5 kHz SEA (AP) Ltd. SWATHplus-M phase-differencing sidescan sonars. CSUMB conducted mapping in the summers of 2006 and 2007 using a 244 kHz Reson 8101 multibeam echosounder. Fugro Pelagos conducted multibeam mapping in 2008 using a combination of 400 kHz Reson 7125, 240 kHz Reson 8101, and 100 kHz Reson 8111 multibeam echosounders. Fugro Pelagos also conducted coastal bathymetric and topographic lidar mapping in 2009 for the U.S. Army Corps of Engineers (USACE) Joint Lidar Bathymetry Technical Center of Expertise using the SHOALS-1000T bathymetric and the Leica ALS60 topographic lidar systems. All of these mapping missions combined to collect bathymetry from the 0-m isobath to beyond the 3-nautical mile limit of California’s state waters.

Purpose:

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.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2015

Currentness_Reference: Publication Date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -120.19

East_Bounding_Coordinate: -119.99

North_Bounding_Coordinate: 34.47

South_Bounding_Coordinate: 34.39

Keywords:

Theme:

Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)

Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Bathymetry

Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Seafloor Topography

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: Marine Geology

Theme_Keyword: Multibeam

Theme_Keyword: Contours

Theme_Keyword: Bathymetry

Theme_Keyword: Water Depth

Theme_Keyword: Ocean Floor Topography

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Pacific Coastal and Marine Science Center

Theme_Keyword: CMGP

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: geoscientificinformation

Theme_Keyword: imageryBaseMapsEarthCover

Theme_Keyword: oceans

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)

Place_Keyword: Santa Barbara Channel

Place_Keyword: Refugio Beach

Place_Keyword: Pacific Ocean

Place_Keyword: State of California

Access_Constraints: None

Use_Constraints:

This information is not intended for navigational purposes.
Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Peter Dartnell

Contact_Organization:

U.S. Geological Survey, Pacifc Coastal and Marine Science Center

Contact_Position: Physical Scientist

Contact_Address:

Address_Type: mailing and physical address

Address: 400 Natural Bridges Dr.

City: Santa Cruz

State_or_Province: CA

Postal_Code: 95060-5792

Country: USA

Contact_Voice_Telephone: (831) 460-7415

Contact_Facsimile_Telephone: (831) 427-4709

Contact_Electronic_Mail_Address: pdartnell@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

<https://pubs.usgs.gov/ds/781/OffshoreRefugioBeach/images/Contours_OffshoreRefugioBeach.jpg>

Browse_Graphic_File_Description: Bathymetry contours offshore Refugio Beach.

Browse_Graphic_File_Type: JPEG

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: Not applicable.

Logical_Consistency_Report: Unspecified

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: +/- 2 meters

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: 0.05 percent of the water depth.

Lineage:

Process_Step:

Process_Description:

During the CSUMB mapping missions, an Applanix positioning and motion compensation system (POS/MV) was used to accurately position the vessel during data collection, and it also accounted for vessel motion such as heave, pitch, and roll (position accuracy, ±2 m; pitch, roll, and heading accuracy, ±0.02 degrees; heave accuracy, ±5%, or 5 cm). NavCom 2050 GPS receiver (CNAV) data were used to account for tidal-cycle fluctuations, and sound-velocity profiles were collected with an Applied Microsystems (AM) SVPlus sound velocimeter. Soundings were corrected for vessel motion using the Applanix POS/MV data, for variations in water-column sound velocity using the AM SVPlus data, and for variations in water height (tides) using vertical-position data from the CNAV receiver. Final XYZ soundings and bathymetric-surface models were referenced to the World Geodetic System of 1984 (WGS 1984) relative to the North American Vertical Datum of 1988 (NAVD 1988). During the USGS mapping missions, DGPS data and measurements of vessel motion (heave, pitch, and roll) were combined in a CodaOctopus F180 attitude-and-position system to produce a high-precision vessel-attitude packet. This packet was transmitted to the acquisition software in real time and combined with instantaneous sound-velocity measurements at the transducer head before each ping. The returned samples were projected to the seafloor using a ray-tracing algorithm that works with previously measured sound-velocity profiles. Statistical filters were applied to the raw samples that discriminate the seafloor returns (soundings) from unintended targets in the water column. The original soundings were referenced to the WGS 1984 relative to the MLLW (Mean Lower Low Water) tidal datum, but, through postprocessing using NOAA's VDatum tool, the soundings were transformed to NAVD 1988. Finally, the soundings were converted into 2-m-resolution bathymetric-surface-model grids. During the Fugro Pelagos mapping mission that was completed as part of the National Coastal Mapping Program of USACE, the Leica ALS60 topographic-lidar and the SHOALS-1000T bathymetric-lidar systems were mounted on an aircraft that flew survey lines at an altitude of 300 to 400 m (bathymetry) and 300 to 1,200 m (topography), at speeds of between 135 and 185 knots. The ALS60 system collected data at a maximum pulse rate of 200 kHz, and the SHOALS system collected data at 1 kHz. Information on aircraft position, velocity, and acceleration were collected using the Novatel and POS A/V 410 systems (SHOALS) and the onboard GPS/IMU system (ALS60). Aircraft-position data were processed using POSPac software, and the results were combined with the lidar data to produce 3-D positions for each lidar shot. Various commercial and proprietary software packages were used to clean the data, to convert all valid data from ellipsoid to orthometric heights, and to export the data as a series of first-return topography and bathymetry ASCII files. Final grids were provided in geographic coordinates referenced to the NAVD 1988. After projecting the data to a common projection and datum, all bathymetry data within State Waters of the Santa Barbara Channel were merged in WGS84 UTM 11N, de-sampled to 10-m resolution. A smooth arithmetic mean convolution function applying a weight of one-ninth to each cell in a 3-pixel by 3-pixel matrix was then applied iteratively to the grid ten times. Following smoothing, contour lines were generated at 10-meter intervals from 10 to 100 m and 50-meter intervals deeper than 100 m. Small gaps in contours were connected while leaving the CONTOUR fields blank to facilitate identification. Contours within the Offshore Refugio Beach map area were reprojected to UTM, zone 10.

Process_Date: 2012

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Andrew C. Ritchie

Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Position: Physical Scientist

Contact_Address:

Address_Type: mailing and physical address

Address: 400 Natural Bridges Dr.

City: Santa Cruz

State_or_Province: CA

Postal_Code: 95060-5792

Country: USA

Contact_Voice_Telephone: NA

Contact_Electronic_Mail_Address: aritchie@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 31

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: WGS 1984 UTM Zone 10N

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -123.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000.0

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.0001

Ordinate_Resolution: 0.0001

Planar_Distance_Units: Meter

Geodetic_Model:

Horizontal_Datum_Name: WGS84

Ellipsoid_Name: NAVD 1988

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Contours_OffshoreCarpinteria.shp

Entity_Type_Definition:

The shapefile attributes include FID - Internal Feature Number, SHAPE - feature geometry, ID - feature ID, and CONTOUR - contour depth value. The shapefile can be added to any ESRI ArcMap project.

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Polyline

Attribute:

Attribute_Label: ID

Attribute_Definition:

Unique identifier for each contour line. Value of 0 means the line segment has been generated during the smoothing process.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 137

Attribute_Units_of_Measure: integer count

Attribute:

Attribute_Label: CONTOUR

Attribute_Definition:

Contours are lines that connect points of equal depth based on the bathymetry grid. The contour values indicate the depth value the line represents. This makes it easier to identify features on the seafloor. After smoothing of the bathymetry grid, contour lines were generated at 10-meter intervals from -10 m to -100 m and 50-meter intervals from -100 to -250m. Values are negative to indicate depth below sea level. The value of 0 represents a line segment created during the smoothing process.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -10

Range_Domain_Maximum: -100

Attribute_Units_of_Measure: meters depth

Metadata_Reference_Information:

Metadata_Date: 20121129

Metadata_Review_Date: 20121129

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Peter Dartnell

Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Position: Physical Scientist

Contact_Address:

Address_Type: mailing and physical address

Address: 400 Natural Bridges Dr.

City: Santa Cruz

State_or_Province: CA

Postal_Code: 95060-5792

Country: USA

Contact_Voice_Telephone: (831) 460-7415

Contact_Facsimile_Telephone: (831) 427-4709

Contact_Electronic_Mail_Address: pdartnell@usgs.gov

Metadata_Standard_Name:

Content Standard for Digital Geospatial Metadata ("CSDGM version 2")

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: universal time