# BathymetryB [CSUMB]--Offshore Aptos, 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?

Title: BathymetryB [CSUMB]--Offshore Aptos, California
Abstract:
This part of DS 781 presents data for the bathymetry map of Offshore of Aptos map area, California. Bathymetry data are provided as two separate grids depending on mapping agency and processing method. This metadata file refers to the data included in "BathymetryB_CSUMB_OffshoreAptos.zip" which are accessible from https://doi.org/10.5066/F7K35RQB. These data accompany the pamphlet and map sheets of Cochrane, G.R., Johnson, S.Y., Dartnell, P., Greene, H.G., Erdey, M.D, Dieter, B.E., Golden, N.E., Hartwell, S.R., Ritchie, A.C., Kvitek, r.G., Maier, K.L., Endris, C.A., Davenport, C.W., Watt, J.T., Sliter, R.W., Finlayson, D.P., and Krigsman, L.M., (G.R. Cochrane and S.A. Cochran, eds.), 2016, California State Waters Map Series—Offshore of Aptos, California: U.S. Geological Survey Open-File Report 2016–1025, 43 p., 10 sheets, scale 1:24,000, https://doi.org/10.3133/ofr20161025.
The bathymetry and shaded-relief maps of Offshore Aptos, California, were generated from bathymetry data collected by the U.S. Geological Survey (USGS) and by California State University, Monterey Bay (CSUMB). Mapping was completed between 2006 and 2009 using a combination of a 244-kHz Reson 8101 multibeam echosounder and a 234-kHz SEA SWATHplus bathymetric sidescan-sonar system. The mapping missions collected bathymetry data from about the 10-m isobath to beyond the 3-nautical-mile limit of California's State Waters. NOTE: The horizontal datum of this bathymetry data (NAD83) differs from the horizontal datum of other layers in this data release (WGS84).
Supplemental_Information:
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.

1. How might this data set be cited?
   Dartnell, Peter, Ritchie, Andrew C., and Finlayson, David P., 2015, BathymetryB [CSUMB]--Offshore Aptos, California: Data Series DS 781, U.S. Geological Survey, Reston, VA.

   Online Links:

   - https://doi.org/10.3133/ds781
   - https://cmgds.marine.usgs.gov/data/csmp/OffshoreAptos/data_catalog_OffshoreAptos.html

   This is part of the following larger work.

   Golden, Nadine E., 2015, 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: -122.00
   East_Bounding_Coordinate: -121.80
   North_Bounding_Coordinate: 37.00
   South_Bounding_Coordinate: 36.84
3. What does it look like?
   https://www.sciencebase.gov/catalog/file/get/5576269de4b032353caef2b1?f=__disk__09%2Fab%2F63%2F09ab63811c4864567dc9e821c6e6feff234b26bc&allowOpen=true (JPEG)
     Bathymetry map of offshore Aptos.
4. Does the data set describe conditions during a particular time period?
   Beginning_Date: 2006
   Ending_Date: 2009
   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 5870 x 5943 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: -123.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 500000.0
      False_Northing: 0.00
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 3.0
      Ordinates (y-coordinates) are specified to the nearest 3.0
      Planar coordinates are specified in Meters
      The horizontal datum used is NAD83.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.00.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988
      Altitude_Resolution: 2.0
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method: Attribute values
7. How does the data set describe geographic features?
   Value
     BathymetryB [CSUMB] depth values (Source: ESRI)
     VALUE
       Bathymetry depth values (Source: ESRI)

       Range of values
       Minimum: | -268.03
       Maximum: | -74.76
       Units: | meters

     Entity_and_Attribute_Overview:
     The complete CSUMB 3-m resolution bathymetry grid for Offshore of Aptos were originally archived as an ESRI grid with the following attributes. NOTE: the horizontal datum of the bathymtry data (NAD83) differs from the horizontal datum of other layers in this DS (WGS84).

         Cell size = 3.0
         Number of rows = 5870
         Number of columns = 5943

         Data type = floating point

         Boundary
         Xmin = 588830
         Xmax = 606659
         Ymin = 4077950
         Ymax = 4095560

         Statistics
         Minimum value = -268.03
         Maximum value = -74.76
         Mean = -128.94
         Standard deviation = 44.88

         Coordinate system description
         Projection  UTM
         Zone  10
         Datum  NAD83
         Vertical Datum  NAVD88
         Units  meter

     Entity_and_Attribute_Detail_Citation: none

### Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   - Peter Dartnell
   - Andrew C. Ritchie
   - David P. Finlayson
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?

> 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 seafloor features.

### 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: 2006 (process 1 of 6)
     During the CSUMB mapping mission, an Applanix POS MV (Position and Orientation System for Marine Vessels) was used to accurately position the vessels 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°; heave accuracy, ±5%, or 5 cm). To account for tidal-cycle fluctuations, KGPS data(GPS data with real-time kinematic corrections) was used; in addition, 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 KGPS receivers. Finally, the soundings were converted into a 3-m-resolution bathymetric-surface-model grid. Person who carried out this activity:
     Carrie Bretz
     Seafloor Mapping Lab, California State University Monterey Bay
     Projects Manager, GIS & Metadata Supervisor
     100 Campus Center, Bldg 13
     Seaside, CA
     USA

     831.582.4197 (voice)
     carrie_bretz@csumb.edu
   Date: 2014 (process 2 of 6)
     California State University, Monterey Bay, Seafloor Mapping Lab 3-m resolution bathymetry data (SoCy_3mbathy) within this map area were downloaded from California State University, Monterey Bay, Seafloor Mapping Lab (http://seafloor.csumb.edu/SFMLwebDATA.htm). The 3-m resolution bathymetry grid was clipped to the Offshore of Aptos, California, map boundary. Person who carried out this activity:
     Pete Dartnell
     U.S. Geological Survey, Pacific Coastal and Marine Science Center
     Physical Scientist
     2885 Mission Street
     Santa Cruz, CA
     USA

     (831) 460-7415 (voice)
     pdartnell@usgs.gov
   Date: 05-Oct-2017 (process 3 of 6)
     Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
     U.S. Geological Survey
     Attn: Alan O. Allwardt
     Contractor -- Information Specialist
     2885 Mission Street
     Santa Cruz, CA

     831-460-7551 (voice)
     831-427-4748 (FAX)
     aallwardt@usgs.gov
   Date: 26-Apr-2018 (process 4 of 6)
     Added keywords from Coastal and Marine Ecological Classification Standard (CMECS) to metadata. Person who carried out this activity:
     U.S. Geological Survey
     Attn: Alan O. Allwardt
     Contractor -- Information Specialist
     2885 Mission Street
     Santa Cruz, CA

     831-460-7551 (voice)
     831-427-4748 (FAX)
     aallwardt@usgs.gov
   Date: 08-Sep-2020 (process 5 of 6)
     Edits were made to bring the metadata up to current PCMSC standards including standardizing authors' names, adding a doi# link, correcting typos, refining keywords, and using current access and distribution liability statements. Point of Contact and Metadata Contact information sections were changed to static PCMSC contact information. No data were changed. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. 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 6 of 6)
     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
3. What similar or related data should the user be aware of?
   Cochrane, Guy R., Johnson, Samuel Y., Dartnell, Peter, Greene, H. Gary, Erdey, Mercedes D., Dieter, Bryan E., Golden, Nadine E., Hartwell, Stephen R., Ritchie, Andrew C., Kvitek, Rikk G., Maier, Katherine L., Endris, Charles A., Davenport, Clifton W., Watt, Janet T., Sliter, Ray W., Finlayson, David P., and Krigsman, Lisa M., 2016, California State Waters Map Series--Offshore of Aptos, California: Open-File Report 2016-1025, U.S. Geological Survey, Reston, VA.

   Online Links:

   - https://doi.org/10.3133/ofr20161025

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

1. How well have the observations been checked?
   Not applicable for raster data.
2. How accurate are the geographic locations?
   Estimated to be no less than 2 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
3. How accurate are the heights or depths?
   Estimated to be no less than 20 cm, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
4. Where are the gaps in the data? What is missing?
   Complete
5. How consistent are the relationships among the observations, including topology?
   Unspecified

### How can someone get a copy of the data set?

> Are there legal restrictions on access or use of the data?

> > Access_Constraints: None
> > Use_Constraints:
> > 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 as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.

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 download includes the image (.tif), the world registration file (.tfw), and a color ramp file. The TXT, XML, HTML, and FAQ versions of the metadata for the BathymetryB [CSUMB] data layer of Offshore of Aptos, California are also included in the download.`
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 download includes the image (.tif), the world registration file (.tfw), and a color ramp file. The TXT, XML, HTML, and FAQ versions of the metadata for the BathymetryB [CSUMB] data layer of Offshore of Aptos, California are also included in the download. in format GeoTiff (version ArcMap (version 10.0, ESRI , 2011)) Raster data layer is registered TIFF image in the UTM Zone 10 coordinate system with datum NAD83. Size: 3.7
     Network links: | https://www.sciencebase.gov/catalog/file/get/556f7817e4b0d9246a9fd05c https://www.sciencebase.gov/catalog/item/556f7222e4b0d9246a9fd04e 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, OffshoreAptosGIS.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 "Offshore Aptos" and has all the data symbolized as on the data release 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: 19-Oct-2020
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)

Generated by `mp` version 2.9.50 on Tue Dec 21 14:38:58 2021