Bathymetry image of Sarasota, FL study area (smoothed, gradiated pseudo-color GeoTIFF)

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

Frequently anticipated questions:

What does this data set describe?

Title:
Bathymetry image of Sarasota, FL study area (smoothed, gradiated pseudo-color GeoTIFF)
Abstract:
The U.S. Geological Survey, in cooperation with the University of South Florida and Eckerd College, completed a bathymetric, sidescan sonar, high-resolution seismic-reflection, and surface sediment sampling survey of the inner shelf environment along the western Florida coast. The survey area extends 15km from Sarasota Point to Buttonwood Harbor. This study is part of a larger program initiated by the U.S. Geological Survey to map the geologic framework and monitor the modern processes that affect the western Florida coastal zone. This portion of the project included a reconnaissance high-resolution seismic and side-scan sonar surveys of the entire study area, detailed mapping to identify patterns of hard grounds and sediment cover, and coring of sediments to document historical development of the inner shelf and coastal
Supplemental_Information:
This image has a smoothed pseudo-color table assigned to the look-up table. These data were collected on U.S. Geological Survey field activity 1995-004-FA (BLWS 95-04) https://cmgds.marine.usgs.gov/services/activity.php?fan=1995-004-FA .
  1. How might this data set be cited?
    David C. Twichell, Jr., 1999, Bathymetry image of Sarasota, FL study area (smoothed, gradiated pseudo-color GeoTIFF): Open-File Report 99-396, U.S. Geological Survey, Coastal and Marine Geology Team, Woods Hole Field Center.

    Online Links:

    This is part of the following larger work.

    Twichell, David C., and Paskevich, Valerie F., 1999, Bathymetry, sidescan sonar image, surface sediments, and surfical geological map of the inner shelf off Sarasota, Florida: Preliminary discussion and GIS database release: Open-File Report 99-396, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Twichell, D.C., and Paskevich, V.F., 1999, Bathymetry, sidescan sonar image, surface sediments, and surfical geological map of the inner shelf off Sarasota, Florida— Preliminary discussion and GIS database release: U.S. Geological Survey Open-File Report 99-396, https://doi.org/10.3133/ofr99396
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -82.73332
    East_Bounding_Coordinate: -82.56665
    North_Bounding_Coordinate: 27.3856
    South_Bounding_Coordinate: 27.2151
  3. What does it look like?
    https://pubs.usgs.gov/of/1999/of99-396/data/imagery/utmd00/bathy1.tif (8-bit color image with smoothed pseudo-color table assigned to the LUT)
    TIFF
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 02-May-1995
    Ending_Date: 08-May-1995
    Currentness_Reference:
    field_work of data acquisition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: remote-sensing image
  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 4617 x 4063, type Pixel
    2. What coordinate system is used to represent geographic features?
      The map projection used is Transverse Mercator.
      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.99960
      Longitude_of_Central_Meridian: -081.000000
      Latitude_of_Projection_Origin: +00.000000
      False_Easting: 500000
      False_Northing: 0.00000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 4.0003238217
      Ordinates (y-coordinates) are specified to the nearest 4.0465400583
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean sea level
      Depth_Resolution: 4
      Depth_Distance_Units: Meters
      Depth_Encoding_Method: Implicit coordinate
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • David C. Twichell, Jr.
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: David Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Hours_of_Service: 8:00am-5:00pm ET; M-F

Why was the data set created?

This GIS overlay is a component of the Sarasota, Florida ArcView GIS database and contains the gridded bathymetry data for the study area. Image resolution is 4m pixels. Image dn values represent depth in decimeters.

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: 27-Jul-1994 (process 1 of 2)
    Tide-corrected depth measurements were gridded in PCI. Person who carried out this activity:
    U.S. Geological Survey
    Attn: David Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Hours_of_Service: 8:00am-5:00pm ET; M-F
    Date: 12-Aug-2025 (process 2 of 2)
    This metadata file was edited for inclusion in the CMHRP metadata inventory. These edits included but are not limited to converting the metadata from HTML to XML format; fixing the publication date; added additional information in the identification section such as adding the series information, larger work ctation as well as the online links. Added the field activity number and link to the supplemental information; added the ISO 19115 Topic Category and USGS Thesaurus and appropriate terms; added the full URL to the browse graphic; specified that the information was not available freom the original metadata in some of the fields; updated the distribution liability with an FSP approved statement; added the online digital transfer option and links; updated the metadata date; provided a generic email and contact instructions in the metadata contact section; fixed all errors. The original metadata specified the North American Datum of 1983 for the horizontal datum, with the ellipsoid being WGS84. This is not possible. So the ellipsoid was modified to the GRS80 ellipsoid and associated values which is in alignment with a NAD83 datum. A persistent identifier (PID) was added to the metadata in the thesaurus section. (20250812) Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@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?
  2. How accurate are the geographic locations?
    No information was available in the original metadata.
  3. How accurate are the heights or depths?
    No information was available in the original metadata.
  4. Where are the gaps in the data? What is missing?
    All collected data were processed and used to generate the digital mosaic.
  5. How consistent are the relationships among the observations, including topology?
    No information available from the original metadata.

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 The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: Dave Twichell
    Data Librarian
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700-2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
  2. What's the catalog number I need to order this data set? bathy1.tif
  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?
  5. What hardware or software do I need in order to use the data set?
    The user must have a program capable of reading and processing 'geotiff' images.

Who wrote the metadata?

Dates:
Last modified: 12-Aug-2025
Metadata author:
USGS, Coastal and Marine Geology Team
Attn: Valerie Paskevich
Computer Specialist
384 Woods Hole Road
Woods Hole, MA
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the U.S. Geological Survey.
Metadata standard:
FGDC CSDGM (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr1999-396/bathy1_meta.faq.html>
Generated by mp version 2.9.51 on Tue Aug 12 17:03:17 2025