LAND_SRELIEF30M.TIF - 30-m resolution image of the shaded-relief USGS topography for eastern Massachusetts

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

Frequently-anticipated questions:


What does this data set describe?

Title:
LAND_SRELIEF30M.TIF - 30-m resolution image of the shaded-relief USGS topography for eastern Massachusetts
Abstract:
The U.S. Geological Survey has conducted geologic mapping to characterize the sea floor offshore of Massachusetts. The mapping was carried out using a Simrad Subsea EM 1000 Multibeam Echo Sounder on the Frederick G. Creed on four cruises conducted between 1994 and 1998. The mapping was conducted in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and with support from the Canadian Hydrographic Service and the University of New Brunswick. The long-term goal of this mapping effort is to produce high-resolution geologic maps and a Geographic Information System (GIS) project that presents images and grids of bathymetry, shaded relief bathymetry, and backscatter intensity data from these surveys that will serve the needs of research, management and the public.
  1. How should this data set be cited?

    Butman, Bradford, and Danforth, William W. , 2006, LAND_SRELIEF30M.TIF - 30-m resolution image of the shaded-relief USGS topography for eastern Massachusetts: Data Series 99, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Butman, Bradford, Valentine, Page C. , Middleton, Tammie J. , and Danforth, William W. , 2006, A GIS Library of Multibeam Data for Massachusetts Bay and the Stellwagen Bank National Marine Sanctuary: Data Series 99, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -71.9
    East_Bounding_Coordinate: -69.8
    North_Bounding_Coordinate: 43.25
    South_Bounding_Coordinate: 41.2

  3. What does it look like?

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

    Calendar_Date: 2006
    Currentness_Reference: publication date

  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 3123 x 3471 x 1, type Pixel

    2. What coordinate system is used to represent geographic features?

      The map projection used is Mercator.

      Projection parameters:
      Standard_Parallel: 41.650000
      Longitude_of_Central_Meridian: -70.316667
      False_Easting: 0.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 30.000000
      Ordinates (y-coordinates) are specified to the nearest 30.000000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Band_1

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Bradford Butman
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2212 (voice)
    (508) 457-2310 (FAX)
    bbutman@usgs.gov


Why was the data set created?

This image provides shaded-relief topography of eastern Massachusetts for use on USGS Map I-2734.


How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    Center, EROS Data , continuous, National Elevation Data Set: National Elevation Dataset online digital database, U.S. Geological Survey, Sioux Falls, SD.

    Online Links:

    Type_of_Source_Media: downloaded digital files
    Source_Contribution:
    The USGS National Elevation Dataset (NED) has been developed by merging the highest-resolution, best-quality elevation data available across the United States into a seamless raster format. NED is the result of the maturation of the USGS effort to provide 1:24,000-scale Digital Elevation Model (DEM) data with NAD83 datum for the conterminous US and Hawaii, and 1:63,360-scale DEM data with NAD27 datum for Alaska.

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

    (process 1 of 1)
    Convert National Elevation Data (NED) set into shaded relief image at 30-m resolution. This was accomplished by gridding the XYZ values from the NED data set for Boston and Cape Cod using software developed by the Ocean Mapping Group (www.omg.unb.ca/~jhc/SwathEd.html).
    1. Download data from National Elevation Dataset website (<http://gisdata.usgs.net/ned>) in ESRI grid format. Crop data to boundaries of USGS Map I-2734.
    2. Create a 30-m grid of the NED data using SwathEd routine weighgrid to generate a binary grid compatible with the UNB software. The grid is mapped in the mercator projection.
    3. Create a shaded relief image of the bathymetry using SwathEd routine addSUN (sun elevation of 45 degrees from 350, vertically exaggerating 4 times).
    Command line: addSUN -elev 45 -azi350 -vert_exag 4.0 gridFile.r4 filename.shade
    4. Use a two-point linear contrast stretch to enhance the shaded relief image:
    Command line: stretchacres -low 105 -high 255 -in filename.shade -out filename_shade.stretch
    5. Convert the contrast-stretched shaded relief image from SwathEd format to a tiff file using the netpbm utilities (<http://netpbm.sourceforge.net/>):
    Command line: rawtopgm -headerskip 1024 image_width image_height filename_shade.stretch | pnmtotiff -none - > filename.tif
    6. Create an ESRI world file (tfw) for the shaded relief tiff image for import to ArcView or ArcGIS. Copy bounding box and resolution information from the jview program output to the tfw file.
    Command line: jview filename_shade.stretch

    Person who carried out this activity:

    William W. Danforth
    U.S. Geological Survey
    Operational Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2274 (voice)
    (508) 457-2310 (FAX)
    bdanforth@usga.gov

    Hours_of_Service: 8am to 5pm
  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 observations, including topology?


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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS), EROS Data center as the source of this information.

  1. Who distributes the data set? (Distributor 1 of 2)

    Bradford Butman
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, Massachusetts 02543-1598
    USA

    (508) 548-8700 x2212 (voice)
    (508) 457-2309 (FAX)
    bbutman@usgs.gov

    Hours_of_Service: 8 a.m. to 5 p.m. EST
  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Although these data have been used by the U.S. Geological Survey (USGS), U.S. Department of the Interior (DOI), no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    This image is available as a GeoTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.


  1. Who distributes the data set? (Distributor 2 of 2)

    U.S. Geological Survey Information Services
    Box 25286
    Denver, CO 80225-0046

    (303) 202-4700 (voice)
    (303) 202-4188 (FAX)

    Hours_of_Service: 8am to 5pm (Mountain Time)
  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Although these data have been used by the U.S. Geological Survey (USGS), U.S. Department of the Interior (DOI), no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    This image is available as a GeoTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.


Who wrote the metadata?

Dates:
Last modified: 06-Mar-2007
Metadata author:
Bradford Butman
U.S. Geological Survey
Oceanographer
384 Woods Hole Rd.
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2212 (voice)
(508) 457-2310 (FAX)
bbutman@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.1 on Wed Mar 28 13:05:53 2007