Transgressive contours--Santa Barbara Channel, 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., Wong, Florence L., and Phillips, Eleyne L., 2012, Transgressive contours--Santa Barbara Channel, California: Data Series DS 781, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.3133/ds781
   • https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/data_catalog_SantaBarbaraChannel.html

   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://doi.org/10.3133/ds781

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -120.206232
   East_Bounding_Coordinate: -119.123028
   North_Bounding_Coordinate: 34.492447
   South_Bounding_Coordinate: 34.027787
   

3. What does it look like?

   https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/images/TransgressiveContours_SantaBarbaraChannel.jpg (JPEG)

   Map showing the transgressive contours for the Santa Barbara Channel, California, map region

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

   Beginning_Date: 2005

   Ending_Date: 2009

   Currentness_Reference:

   ground condition

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

   Geospatial_Data_Presentation_Form: vector digital data
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (208)
   2. What coordinate system is used to represent geographic features?
      

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:

      UTM_Zone_Number: 11
      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -117.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 50.000000
      Ordinates (y-coordinates) are specified to the nearest 50.000000
      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.
      
7. How does the data set describe geographic features?

   Transgressive_contours

   lines of equal depth to transgressive surface (Source: standard sedimentology)

   FID

   Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI) Coordinates defining the features.

   ID

   sequential feature number (Source: this study) sequential feature numbers

   CONTOUR

   lines of equal depth to transgressive surface (Source: this study) depth to transgressive surface

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
   • Florence L. Wong
   • Eleyne L. Phillips
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   Attn: PCMSC Science Data Coordinator

   2885 Mission Street

   Santa Cruz, CA
   

   US

   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?

   Z-3-07-SC (source 1 of 2)

   U.S. Geological Survey (USGS), Coastal and Marine Geology Program (CMGP), 2007, Seismic-reflection data acquisition data of field activity Z-3-07-SC in Santa Barbara Channel region: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG), Menlo Park, CA.

   Online Links:

   • https://cmgds.marine.usgs.gov/fan_info.php?fan=Z307SC

   Type_of_Source_Media: ASCII lat/long shot point files
   Source_Contribution:

   Digital seismic data used to interpret subsurface geologic structure

   S-7-08-SC (source 2 of 2)

   U.S. Geological Survey (USGS), Coastal and Marine Geology Program (CMGP), 2013, Seismic-reflection data acquisition data of field activity S-7-08-SC in Santa Barbara Channel region: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG), Menlo Park, CA.

   Online Links:

   • https://cmgds.marine.usgs.gov/fan_info.php?fan=S708SC

   Type_of_Source_Media: ASCII lat/long shot point files
   Source_Contribution:

   Digital seismic data used to interpret subsurface geologic structure

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

   Date: 2011 (process 1 of 7)

   Chirp and sparker seismic-reflection data from USGS field activity Z-3-07-SC and chirp data from field activity S-7-08-SC were imported to SEISWORKS. (Ray Sliter, rsliter@usgs.gov)

   Date: 2011 (process 2 of 7)

   Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks (S.Y. Johnson, sjohnson@usgs.gov)

   Date: 2011 (process 3 of 7)

   Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks (S.Y. Johnson, sjohnson@usgs.gov)

   Date: 2011 (process 4 of 7)

   Data exported and converted with 1,500 m/sec velocity in water and 1,600 m/sec velocity in sediment. (Ray Sliter, rsliter@usgs.gov).

   Date: 2011 (process 5 of 7)

   X, Y locations and sediment thickness value Z imported to ArcGIS format as points, interpolated to preliminary surface with TopoRaster. Because processing of the related sediment-thickness map resulted in an interpolated surface that diverged from the data exported from Seisworks, the final transgressive surface was calculated by subtracting sediment thickness from multibeam bathymetry. (Florence Wong, fwong@usgs.gov; Eleyne Phillips, ephillips@usgs.gov)

   Date: 2011 (process 6 of 7)

   Depth to transgressive surface grid contoured at 5-meter intervals. (Eleyne Phillips, ephillips@usgs.gov)

   Date: 28-Mar-2023 (process 7 of 7)

   Metadata was modified to bring up to current USGS PCMSC standards. USGS Thesaurus and keywords were added, added keywords section with USGS persistent identifier as theme keyword, Point of Contact and Metadata Contact information was updated, and Process Steps were refined. Information about the data available for download and different Network Resource Name links and details were given in the Standard Order Process section. Minor typos were corrected. No data information was changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent. 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

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 1,000-2,000 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 10 m of variation in position. The sparker position may vary as much as 20 m from the navigation reference on the vessel.
3. How accurate are the heights or depths?
   
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, omitting values over Hueneme Canyon.
5. How consistent are the relationships among the observations, including topology?
   All vector geometry and attributes are present.

How can someone get a copy of the data set?

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

   345 Middlefield Rd

   Menlo Park, CA
   

   USA

   (650) 329-4309 (voice)
2. What's the catalog number I need to order this data set? The .zip file includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as FGDC-compliant metadata.
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:	shapefile (version 9.3.1) Arcinfo grid Size: 0.7
     Network links:	https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/data/TransgressiveContours_SantaBarbaraChannel.zip https://pubs.usgs.gov/ds/781/SantaBarbaraChannel/data_catalog_SantaBarbaraChannel.html 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, SantaBarbaraChannelGIS.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 the Santa Barbara Channel region, and has all the data symbolized as on the 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: 28-Mar-2023

Metadata author:

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

Attn: PCMSC Science Data Coordinator

2885 Mission Street

Santa Cruz, CA

US

831-427-4747 (voice)

pcmsc_data@usgs.gov

Metadata standard:

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