Depth to Transition--Point Conception to Hueneme Canyon, California

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Johnson, Samuel Y., and Hartwell, Stephen R., 2016, Depth to Transition--Point Conception to Hueneme Canyon, California: Data Series DS 781, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.5066/F7891424
   • https://pubs.usgs.gov/ds/781/
   • https://www.sciencebase.gov/catalog/file/get/589cb9b4e4b0efcedb763f66?.zip

   This is part of the following larger work.
   Golden, Nadine E., 2013, California State Waters Map Series Data Catalog: Data Series DS 781, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://pubs.usgs.gov/ds/781/
   • https://www.sciencebase.gov/arcgis/rest/services/Catalog/58a3b1e7e4b0c8251289ad3e/MapServer
   • https://www.sciencebase.gov/arcgis/services/Catalog/58a3b1e7e4b0c8251289ad3e/MapServer/WMSServer?request=GetCapabilities&service=WMS

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -120.731
   East_Bounding_Coordinate: -119.100
   North_Bounding_Coordinate: 34.607
   South_Bounding_Coordinate: 34.050
   

3. What does it look like?

   https://www.sciencebase.gov/catalog/file/get/589e0435e4b099f50d3a064e?name=DepthToTransition_PointConceptionToHuenemeCanyon.jpg&allowOpen=true (JPEG)

   Depth to Transition for the region between Point Conception to Hueneme Canyon.

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 2007

   Ending_Date: 2014

   Currentness_Reference:

   ground condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: GeoTiff
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 669 x 1934 x 1, type Grid Cell
   2. What coordinate system is used to represent geographic features?
      

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:

      UTM_Zone_Number: 10
      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.0000
      Latitude_of_Projection_Origin: 0.0000
      False_Easting: 500000.0
      False_Northing: 0.00
      

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 50.0
      Ordinates (y-coordinates) are specified to the nearest 50.0
      Planar coordinates are specified in meters
      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      

      Vertical_Coordinate_System_Definition:

      Depth_System_Definition:

      Depth_Datum_Name: NAVD88
      Depth_Resolution: 20.0
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Implicit coordinate
      

7. How does the data set describe geographic features?

   Value

   Depth in meters (Source: Esri)

   VALUE

   Depth in meters to transgressive surface (Source: Esri)

   Range of values
   Minimum:	-187.9
   Maximum:	-2.78
   Units:	meters

   Entity_and_Attribute_Overview:

   Grid value is depth to the transgressive surface of the last glacial maximum in meters.

   Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
   

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Samuel Y. Johnson
   • Stephen R. Hartwell
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   USGS Pacific Coastal and Marine Science Center

   Attn: PCMSC Science Data Coordinator

   2885 Mission Street

   Santa Cruz, CA
   

   USA

   (831) 427-4747 (voice)

   PCMSC_Data@usgs.gov

Why was the data set created?

How was the data set created?

1. From what previous works were the data drawn?

   Depth2TransSBC (source 1 of 8)

   Johnson, Samuel Y., Wong, Florence L., and Phillips, Eleyne L., 2012, Depth To Transition—Santa Barbara Channel, California.

   Online Links:

   • https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/data_catalog_SantaBarbaraChannel.html

   Other_Citation_Details:

   See metadata for “DepthToTransition_SantaBarbaraChannel.zip” for source data and postprocessing/reprocessing information

   Type_of_Source_Media: GeoTiff
   Source_Contribution: depth-to-transition information to merge with new data
   

   2014-632-FA (source 2 of 8)

   Johnson, Samuel, Hartwell, Stephen, and Beeson, Jeff, 2016, Marine geophysical data - Point Sal to Refugio State Beach, southern California: data release doi:10.5066/F7SX6BCD, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/F7SX6BCD

   Other_Citation_Details:

   See ”2014_632_FA_Corrected” metadata for source data and postprocessing/reprocessing information

   Type_of_Source_Media: minisparker seismic-reflection data in SEG-Y format
   Source_Contribution:

   digital seismic data used to interpret subsurface geologic structure

   PointConceptionFaults (source 3 of 8)

   Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Clifton W., 2017, Faults-Offshore of Point Conception map area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://www.sciencebase.gov/catalog/file/get/58a0df98e4b0c82512856401

   Type_of_Source_Media: polyline shapefile
   Source_Contribution: faults were used to interpret subsurface geologic structure
   

   GaviotaFaults (source 4 of 8)

   Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Clifton W., 2017, Faults-Offshore of Gaviota map area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://www.sciencebase.gov/catalog/file/get/589a24b6e4b0efcedb71a5b2

   Type_of_Source_Media: polyline shapefile
   Source_Contribution: faults were used to interpret subsurface geologic structure
   

   PointConceptionGeology (source 5 of 8)

   Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Clifton W., 2017, Geology and geomorphology--Offshore of Point Conception Map Area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://www.sciencebase.gov/catalog/file/get/58a0e44ae4b0c82512856407

   Type_of_Source_Media: polyline shapefile
   Source_Contribution: used to determine bedrock outcrops
   

   GaviotaGeology (source 6 of 8)

   Hartwell, Stephen R., Johnson, Samuel Y., and Davenport, Clifton W., 2017, Geology and geomorphology--Offshore of Gaviota map area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://www.sciencebase.gov/catalog/file/get/589a2585e4b0efcedb71a5bc

   Type_of_Source_Media: polyline shapefile
   Source_Contribution: used to determine bedrock outcrops
   

   PointConceptionBathy (source 7 of 8)

   Dartnell, Peter, and Kvitek, Rikk G., 2017, Bathymetry--Offshore of Point Conception Map Area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://www.sciencebase.gov/catalog/file/get/58a0e9f4e4b0c82512856412

   Type_of_Source_Media: GeoTiff
   Source_Contribution: used to calculate depth to transition
   

   GaviotaBathy (source 8 of 8)

   Dartnell, Peter, and Kvitek, Rikk G., 2017, Bathymetry--Offshore of Gaviota Map Area, California: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://www.sciencebase.gov/catalog/file/get/589a426fe4b0efcedb71a67e

   Type_of_Source_Media: GeoTiff
   Source_Contribution: used to calculate depth to transition
   

2. How were the data generated, processed, and modified?

   Date: 2015 (process 1 of 9)

   Water bottom (seabed) and depth to base of the Last Glacial Maximum (LGM) horizons were digitized from seismic-reflection data using Seisworks software. The difference between the two horizons was exported from Seisworks for every shot point as XY coordinates (UTM Zone 10) and two-way travel time (TWT). The thickness was determined by applying a sound velocity to the TWT of 1,500 m/sec in water and 1,600 m/sec velocity in sediment, resulting in sediment thickness values. Data sources used in this process:

   • 2014-632-FA

   Date: 2015 (process 2 of 9)

   XY locations and sediment thickness values Z were imported to ArcGIS format as points and interpolated to a preliminary surface with TopoRaster from which isopachs (thickness contours) were extracted at 2.5 m intervals (see https://www.sciencebase.gov/catalog/item/589cba61e4b0efcedb76497e). Further refinement of this sediment thickness map and the isopach shapefile was accomplished through several iterations of manual editing to incorporate geology and fault information following the methodology of Wong (2012; see http://pubs.usgs.gov/of/2012/1161/). Data sources used in this process:

   • 2014-632-FA, PointConceptionFaults, GaviotaFaults, PointConceptionGeology, GaviotaGeology

   Data sources produced in this process:

   • SedimentThicknessNew

   Date: 2012 (process 3 of 9)

   The depth to the base of the post-Last Glacial Maximum (LGM) unit was generated by adding the thickness data to water depths from the bathymetry data. Data sources used in this process:

   • SedimentThicknessNew, PointConceptionBathy, GaviotaBathy

   Data sources produced in this process:

   • Depth2TransNew

   Date: 2015 (process 4 of 9)

   Depth-to-transition information from Point Conception to Gaviota was merged with depth-to-transition information from the Santa Barbara Channel to create one continuous dataset Data sources used in this process:

   • Depth2TransNew, Depth2TransSBC

   Date: 06-Apr-2018 (process 5 of 9)

   USGS Thesaurus and keywords were added, and Process Steps were refined. Minor typos were corrected. No data information was changed. Person who carried out this activity:
   

   Susan A Cochran

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

   Geologist

   2885 Mission Street

   Santa Cruz, CA
   

   USA

   (831) 460-7545 (voice)

   scochran@usgs.gov

   Date: 14-Sep-2018 (process 6 of 9)

   Point of Contact information was updated. USGS Thesaurus and keywords were added, and details about different Network Resource Name links was given in the Access Instructions section. Phone number for Metadata Contact was corrected. No data information was changed. Person who carried out this activity:
   

   Susan A Cochran

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

   2885 Mission St.

   Santa Cruz, CA
   

   United States

   831-460-7545 (voice)

   scochran@usgs.gov

   Date: 19-Oct-2020 (process 7 of 9)

   Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: VeeAnn A. Cross

   Marine Geologist

   384 Woods Hole Road

   Woods Hole, MA
   

   508-548-8700 x2251 (voice)

   508-457-2310 (FAX)

   vatnipp@usgs.gov

   Date: 14-Oct-2021 (process 8 of 9)

   Performed minor edits to the metadata to correct typos. No data were changed Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: Susan A. Cochran

   Geologist

   2885 Mission Street

   Santa Cruz, CA
   

   831-460-7545 (voice)

   scochran@usgs.gov

   Date: 04-Apr-2022 (process 9 of 9)

   Performed edit to correct Charles W. Davenport to Clifton W. Davenport. No data were changed. (scochran@usgs.gov)

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   Data points are approximately 1 m apart along tracklines and 1000-2000 m apart between tracks. 50-m cell size for interpolation is better supported along track than between.
2. How accurate are the geographic locations?
   The chirp sonar instrument is deployed under the research vessel with about 10m of variation in position. The sparker position may vary as much as 20m from the navigation reference on the vessel.
3. How accurate are the heights or depths?
   Estimated to be approximately 1 m, along the track lines where data is well constrained, but may be much greater in areas where interpolation occurred.
4. Where are the gaps in the data? What is missing?
   Sediment thickness data points exported from Seisworks profiling software were processed within the California 3-nmi limit.
5. How consistent are the relationships among the observations, including topology?
   Not applicable for raster data.

How can someone get a copy of the data set?

1. Who distributes the data set? (Distributor 1 of 1)
   
   U.S. Geological Survey - ScienceBase

   Denver Federal Center, Building 810, Mail Stop 302

   Denver, CO
   

   USA

   1-888-275-8747 (voice)

   sciencebase@usgs.gov
2. What's the catalog number I need to order this data set? The .zip file (https://www.sciencebase.gov/catalog/file/get/589cb9b4e4b0efcedb763f66589cba9fe4b0efcedb764ca2?.zip) includes the .lyr, .tfw, .tif, .tif_ColorRamp.SLD, .tif.aux.xml, .tif.ovr, .tif.vat.cpg, and .tif.vat.dbf files, as well as FGDC-compliant metadata for the Depth to Transition data layer of Point Conception to Hueneme Canyon, California.
3. What legal disclaimers am I supposed to read?
   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.
4. How can I download or order the data?
   • Availability in digital form:

     Data format:

     The .zip file for the TIFF image includes the image (.tif), the world registration file (.tfw), and the text (.txt) and XML (.tif.xml) versions of FGDC-compliant metadata for the Depth to Transition data layer of Point Conception to Hueneme Canyon, California. in format TIFF (version ArcMap (version 10.0, Esri, 2011)) Raster data layer is registered TIFF image in the UTM Zone 10 coordinate system with datum WGS84. Size: 15.5

     Network links:

     https://www.sciencebase.gov/catalog/file/get/589cb9b4e4b0efcedb763f66 https://doi.org/10.5066/F7891424 https://pubs.usgs.gov/ds/781/

   • Cost to order the data: none

5. What hardware or software do I need in order to use the data set?
   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 an Esri ArcMap TIFF. Users should download the ArcGIS Project File, PointConceptionToHuenemeCanyonGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for "Point Conception to Hueneme Canyon" and has all the data symbolized as on the SIM map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS.

Who wrote the metadata?

Dates:

Last modified: 04-Apr-2022

Metadata author:

USGS Pacific Coastal and Marine Science Center

Attn: PCMSC Science Data Coordinator

2885 Mission Street

Santa Cruz, CA

USA

(831) 427-4747 (voice)

PCMSC_Data@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)