Brandon M. Nasr
SeanPaul La Selle
William A.L. Chapman
Noah J. Finnegan
20210604
Vibracore CT scans from the San Lorenzo River
TIFF
data release
DOI:10.5066/P9ZT7ZOX
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P9ZT7ZOX
www.sciencebase.gov/catalog/item/6042bf03d34eb1203119db7e
This data release contains information on computed tomography (CT) images of a vibracore that was collected by the U.S. Geological Survey in 2019. A site next to the San Lorenzo River in Henry Cowell Redwoods State Park, California, was cored to understand the history of recent vertical incision and floodplain abandonment. The core was split into 3 segments after collection. Each segment was scanned using a Geotek Rotating X-ray CT (RXCT) System and CT reconstruction was performed using Geotek reconstruction software. Geotek CT_Quickview software was used to select a representative down-core orthogonal slice from each core segment and the Geotek AddRuler software was used to display core-lengths in each image. The downcore orthogonal slice CT images of each core segment are included as three separate TIFF files. Each TIFF file is accompanied by a software-proprietary XML file that contains the x-ray scanning configuration and settings in addition to dimensional data of the TIFF images.
This dataset was collected to better understand the vertical incision and floodplain abandonment in the San Lorenzo River.
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=2019-673-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
20191105
Ground condition at the time the vibracore was collected
Not planned
-122.07063
-122.07063
37.04239
37.04239
ISO 19115 Topic Category
geoscientificInformation
Data Categories for Marine Planning
Nonliving resources
Physical/Chemical Features
Physical Habitats and Geomorphology
USGS Thesaurus
Core Analysis
Marine Realms Information Bank (MRIB) keywords
Erosion
Sediment
River
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Pacific Coastal and Marine Science Center
PCMSC
None
University California Santa Cruz
UCSC
USGS Metadata Identifier
USGS:6042bf03d34eb1203119db7e
Geographic Names Information System (GNIS)
San Lorenzo River
Henry Cowell Redwoods State Park
State of California
United States of America
None
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 and The University of California Santa Cruz as the originator(s) of the dataset and in products derived from these data.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
No formal attribute accuracy tests were conducted.
The rulers on the TIFF images denote the length of each core segment, not the depths at which the cores were collected.
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.
The location of the sample was 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 position is 3-5 m while receiving WAAS signals.
A vibracore was collected on November 05, 2019. A handheld global satellite navigation system (GNSS) receiver was used to determine the coordinates of the vibracore site. 76.2 mm OD (outer diameter) aluminum irrigation pipe with 1.27 mm wall thickness (inner diameter is 73.66 mm) was driven into the sediment to capture the stratigraphy. A concrete vibrator head attached to the aluminum pipe, which was powered by a Honda GX160~5 HP 4 stroke (modified by Northrock) was used to drive the pipe into the sediment. The pipe was extracted using a winch attached to a steel tripod. Due to difficulty penetrating through dry silt and sand, the borehole was reoccupied twice, resulting in three core segments (A,B,C).
2019
The core segments were brought to the USGS Pacific Coastal and Marine Science Center core facility, where they were split into archive halves and working halves. The working halves' internal structures were imaged with a Geotek Rotating X-Ray CT scanner. Rotational images were acquired every 0.2 degrees at 130 kilovolts (kV) and 210 microamperes, and the rotational images were reconstructed by GeoTek's Reconstructor Software. Once reconstructed, the files were imported into GeoTek's Image Viewer software and a representative downcore slice image was chosen. A ruler was added to the TIFF images using the GeoTek Add Ruler software, which exported the final TIFF and software-proprietary XML files, adding 'R' to the file name. The rulers on the TIFF images denote the length of each core segment, not the depths at which the cores were collected.
20191107
Corrected the URL link to the USGS Field Activity listed in the Supplemental Information section. No data were changed. (scochran@usgs.gov)
20210610
Point
Point
1
0.00001
0.00001
Decimal degrees
NAD83
GRS 1980
6378137.0
298.257222101
SL-19-02_R.zip
Zip file contains 3 TIFF files and their respective software-proprietary XML files.
Producer defined
SL-19-02A_R, SL-19-02B_R, SL-19-02C_R
CT Core images with the following attributes from the Geotek software-proprietary XML files:
>Image-Type= Orthogonal View
>Core ID= SL-19-02
>Section-number= A (B and C are not listed here)
>Physical Width= 9.10
>Physical Height= 110.03
>Physical Top= 1700.01
>Pixels per CM= 104
>Horizontal resolution= 104 pixels
>Pixel width= 946
>Scan Lines= 11473
>Detector gear ration= 462:1
>Camera Name= Thermo Kevex PSX10-65W
>Average= 1
>Filename= SL-19-02A_R, SL-19-02B_R, SL-19-02C_R
>X-ray Voltage= 130
>X-ray Current= 209.8
>X-ray spot size= 38
>Source object distance= 221.73
>Source detector distance= 575.01
>Detector CCD mode= 2x2
>
>Filter:
>Enabled= False
>Window Count= 2
>Window= 400
>SigmaA= 0.1
>SigmaV= 0.0005
>Weight= 0.4
>Window= 100
>SigmaA= 0.1
>SigmaV= 0.0005
>Weight= 1
>Reduction= 0.85
producer defined
946
11473
U.S. Geological Survey - ScienceBase
mailing and physical
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
1-888-275-8747
sciencebase@usgs.gov
These data are available as TIFF images along with their software-proprietary XML files contained in a single zip file (SL-19-02_R.zip) and are accompanied by FGDC-compliant metadata.
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.
TIFF
Macintosh Preview
Zip file contains the TIFF and XML files that are associated with the metadata
Use Winzip
37.06
https://www.sciencebase.gov/catalog/file/get/6042bf03d34eb1203119db7e
https://doi.org/10.5066/P9ZT7ZOX
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to the landing page for the data release.
None.
The zip file contains raster data in TIFF format, which can be opened with most graphics and image editing software.
20210610
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998