Photographs of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
Photographs of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California
Abstract:
This portion of the data release presents linescan images (photographs) from vibracores collected from Searsville Lake, a reservoir in Jasper Ridge Biological Preserve, Stanford, California in October 2018 (USGS Field Activity 2018-682-FA). Images were obtained from two vibracores (JRBP2018-VC01A and JRBP2018-VC01B) at 50-micron (200 pixel per cm) resolution. Color images in 16-bit TIFF format are provided for each core segment, along with proprietary metadata files containing image scaling information.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-682-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    SeanPaul M. La Selle, Stegner, M. Allison, Nasr, Brandon M., Hadly, Elizabeth A., Barnosky, Anthony D., and Sherrod, Brian, 20230131, Photographs of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California: data release DOI:10.5066/P98CEB1B, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    SeanPaul M. La Selle, Stegner, M. Allison, Nasr, Brandon M., Hadly, Elizabeth A., Barnosky, Anthony D., and Sherrod, Brian, 2023, Computed Tomography (CT) scans, photographs, X-ray Fluorescence (XRF) scans, grain size, and gamma-ray bulk density data of vibracores from Searsville Lake, Jasper Ridge Biological Preserve, Stanford, California: data release DOI:10.5066/P98CEB1B, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.23787
    East_Bounding_Coordinate: -122.23783
    North_Bounding_Coordinate: 37.40684
    South_Bounding_Coordinate: 37.40683
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 29-Oct-2018
    Ending_Date: 29-Oct-2018
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00004. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    zip files containing linescan images
    Each zip file contains 2 TIFF files and their respective software-proprietary XML files. (Source: Producer defined)
    JRBP2018-VC01B-158-214cm_linescan, JRBP2018-VC01B-216-364cm_linescan, JRBP2018-VC01B-364-515cm_linescan, JRBP2018-VC01B-515-650cm_linescan, JRBP2018-VC01B-650-801cm_linescan, JRBP2018-VC01B-801-952cm_linescan, JRBP2018-VC01B-952-1103cm_linescan
    Folders each containing two linescan TIFF images representing each core section and their respective Geotek software-proprietary XML files. The TIFF files ending in "_R" include a digital scale on the left side of the image. The Geotek software-proprietary XML files contain the following attributes and example attribute values are provided: <geotek-image> <image-type>giTIFImage</image-type> <coreID>JRBP2018-VC01B-158-214cm</coreID> <section-number>1</section-number> <image-number>1</image-number> <physical-width>8.20</physical-width> <physical-height>56.90</physical-height> <pixels-per-scan>5</pixels-per-scan> <pixels-per-CM>200</pixels-per-CM> <horizontal-resolution>200</horizontal-resolution> <exposure-time-ms>80</exposure-time-ms> <calibration-aperture>5.99</calibration-aperture> <image-aperture>4.07</image-aperture> <red-high-calibration>18.0</red-high-calibration> <green-high-calibration>18.0</green-high-calibration> <blue-high-calibration>18.0</blue-high-calibration> <red-low-calibration>0.0</red-low-calibration> <green-low-calibration>0.0</green-low-calibration> <blue-low-calibration>0.0</blue-low-calibration> <pixel-width>1639</pixel-width> <scan-lines>11380</scan-lines> <filename>IM001_01.tif</filename> <geotek-camera-lighting version="2" mode="visible"> <visible-lighting-data> <bank-two> <bank2cluster1>128</bank2cluster1> <bank2cluster2>128</bank2cluster2> <bank2cluster3>128</bank2cluster3> <bank2cluster4>128</bank2cluster4> <bank2cluster5>128</bank2cluster5> </bank-two> <bank-one> <bank1cluster1>128</bank1cluster1> <bank1cluster2>128</bank1cluster2> <bank1cluster3>128</bank1cluster3> <bank1cluster4>128</bank1cluster4> <bank1cluster5>128</bank1cluster5> </bank-one> </visible-lighting-data> </geotek-camera-lighting> <convg-x-red>0</convg-x-red> <convg-x-green>0</convg-x-green> <convg-x-blue>0</convg-x-blue> <convg-y-red>0</convg-y-red> <convg-y-green>4</convg-y-green> <convg-y-blue>8</convg-y-blue> <is-a-sync-scan-image>0</is-a-sync-scan-image> </geotek-image> (Source: producer defined) These Geotek software-proprietary XML files contain information on linescan image acquisition settings and image scaling. The values in the example provided may be different for each scan. Please contact the PCMSC data coordinator for more information on the contents of these XML files.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • SeanPaul M. La Selle
    • M. Allison Stegner
    • Brandon M. Nasr
    • Elizabeth A. Hadly
    • Anthony D. Barnosky
    • Brian Sherrod
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    PCMSC Science Data Coordinator
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    831-427-474 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Images were obtained to characterize sediments in vibracores. These data are intended for science researchers, students, policy makers, and the general public.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 18-Jun-2019 (process 1 of 2)
    Cores were collected on October 29, 2018. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. Cores were segmented into 150 cm (or shorter) sections in the field and split into "working" and "archive" halves in the lab. Sediment surfaces were cleaned and smoothed on the "working" halves of split cores. A Geotek V Linescan Imaging system mounted to a Geotek Multisensor Core Logger (MSCL) was used to automate continuous downcore photography. A prime lens with a 50 mm focal length was mounted 38.6 cm above the core surface. Cross polarized light emitting diodes (LED) were used to illuminate the sediment surface. Colors were calibrated in the Geotek Linescan software using an 18 percent gray card and images were acquired at an aperture of f4.07 and exposure time of 80 milliseconds. Each zip file corresponding to individual core segments contain two color images in 16-bit TIFF format, along with proprietary metadata files containing image scaling information. The TIFF filenames ending in '_R' contain an embedded vertical scale on the left-hand side. Zip file names correspond to the names of each core segment. For example ‘JRBP2018-VC01A-289-439cm_linescan.zip’ contains two TIFF images from a segment of the vibracore VC01A with a top depth below the lakebed of approximately 289 cm and bottom depth of 439 cm. Person who carried out this activity:
    SeanPaul La Selle
    U.S. Geological Survey, Pacific Coastal and Marine Science CEnter
    Geologist
    2885 Mission St.
    Santa Cruz, CA

    831-460-7574 (voice)
    slaselle@usgs.gov
    Date: 23-Feb-2023 (process 2 of 2)
    corrected typo in doi number (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?
    No formal attribute accuracy tests were conducted
  2. How accurate are the geographic locations?
    The locations of samples were determined using a Garmin etrex 30x handheld global satellite navigation system (GNSS) receiver capable of receiving wide area augmentation system (WAAS) signals. The manufacturer reported accuracy for horizontal positions is 3-5 m while receiving WAAS signals.
  3. How accurate are the heights or depths?
    Core location depths and water depths were not associated with a fixed vertical datum at the time of core collection. No formal positional accuracy tests were conducted, nor were they applicable for this dataset.
  4. Where are the gaps in the data? What is missing?
    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.
  5. How consistent are the relationships among the observations, including topology?
    The core depths listed in the Geotek software’s proprietary metadata files and the ruler alongside the TIFF images are not corrected for sediment compaction and are relative to the surface of the lakebed.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints None. Please see 'Distribution Info' for details.
Use_Constraints None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.
  1. Who distributes the data set? (Distributor 1 of 1)
    GS ScienceBase
    U.S. Geological Survey
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? Linescan images are available in TIFF image format and provided along with 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 for other purposes, nor on all computer systems, 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: Downloadable zip files, ranging in size from 212.5 MB to 581.8 MB, contain linescan TIFF (.tif) images and associated software-proprietary metadata files (.xml). Zip file names correspond to the names of each core segment. For example ‘JRBP2018-VC01A-289-439cm_linescan.zip’ contains linescan TIFF images from the segment of vibracore VC01A with a top depth of 289 cm and bottom depth of 439 cm. in format TIFF Size: 528046
      Network links: https://www.sciencebase.gov/catalog/item/630569ced34e3b967a8b51c1
      https://doi.org/10.5066/P98CEB1B
    • Cost to order the data: None

Who wrote the metadata?

Dates:
Last modified: 23-Feb-2023
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P98CEB1B/JRBP2018-linescan-metadata.faq.html>
Generated by mp version 2.9.51 on Tue Feb 28 13:54:02 2023