Hazard maps of the U.S.

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Frequently anticipated questions:

What does this data set describe?

Title: Hazard maps of the U.S.
Abstract:
The coverages were created using the gridded data available from this ftp site. Most of the gridded data for the United States is at a spacing of 0.1 degrees latitude and longitude. The higher resolution data available for California, Nevada, and part of Arizona and Utah were used for both the U.S. and Western U.S. maps. The gridded data for this area is at a spacing of 0.05 degrees latitude and longitude.
  1. How might this data set be cited?
    U.S. Geological Survey, 1997, Hazard maps of the U.S.: U.S. Geological Survey Open-File Report 97-131 and 97-130.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -125.00
    East_Bounding_Coordinate: -65.00
    North_Bounding_Coordinate: 49.40
    South_Bounding_Coordinate: 24.60
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1997
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a vector data set. It contains the following vector data types (SDTS terminology):
      • GT-polygon composed of chains
    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 0.1. Longitudes are given to the nearest 0.1. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    US1HZ050.PAT
    1.0 second Spectral Acceleration with 10% Probability of Exceedance in 50 years (Source: OFR-97-0131)
    ACC_VAL
    Acceleration value in percent of gravity of the polygon. The polygon represents the range of acceleration values that are contained within its borders. The polygon is assigned the lowest value allowed within the polygon's borders. The range of values allowed within a polygon is controlled by the contours. (Source: OFR-97-0131)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent of gravity
    Resolution:1
    VALLEY
    A topological indicator that tells whether the area contained within the polygon is a local minima (valley) or not. A value of "1" indicates the area is a local minima. (Source: OFR-97-0131)
    ValueDefinition
    0Not a local minima
    1Location of local minima
    US1HZ050.AAT
    1.0 second Spectral Acceleration with 10% Probability of Exceedance in 50 years (same attributes as polygon coverage US1HZ0500.PAT) (Source: OFR-97-0131)
    US1HZ050.PAT
    Point coverage of 1.0 second Spectral Acceleration with 10% Probability of Exceedance in 50 years (same attributes as polygon coverage US1HZ050.PAT) (Source: OFR-97-0131)
    US1HZ100
    Polygon, arc, and point coverage of 1.0 seconds spectral acceleration with 5% probability of exceedance in 50 years. (same attributes as US1HZ050) (Source: OFR-97-0131)
    US1HZ250
    Polygon, arc, and line coverage of 1.0 seconds spectral acceleration with 2% probability of exceedance in 50 years. (same attributes as US1HZ050) (Source: OFR-97-0131)
    US3HZ050
    Polygon, arc, and point coverage of 0.3 second spectral acceleration with 10% probability of exceedance in 50 years (same attributes as US1HZ050) (Source: OFR-97-0131)
    US3HZ100
    Polygon, arc, and point coverage of 0.3 seconds spectral acceleration with 5% probability of exceedance in 50 years (same attributes as US1HZ050) (Source: OFR-97-0131)
    US3HZ250
    Polygon, arc, and point coverage of 0.3 seconds spectral acceleration with 2% probability of exceedance in 50 years (same attributes as US1HZ050) (Source: OFR-97-0131)
    US5HZ050
    Polygon, arc, and point coverage of 0.2 seconds spectral acceleration with 10% probability of exceedance in 50 years (same attributes as US1HZ050) (Source: OFR-97-0131)
    US5HZ100
    Polygon, arc, and point coverage of 0.2 seconds spectral acceleration with 5% probability of exceedance in 50 years. (same attributes as US1HZ050) (Source: OFR-97-0131)
    US5HZ250
    Polygon, arc, and point coverage of 0.2 second spectral accleration with 2% probability of exceedance in 50 years. (same attributes as US1HZ050) (Source: OFR-97-0131)
    USPGA050
    Polygon, arc, and point coverage of peak ground acceleration with 10% probability of exceedance in 50 years. (same attributes as US1HZ050) (Source: OFR-97-0131)
    USPGA100
    Polygon, arc, point coverage of peak ground acceleration with 5% probability of exceedence in 50 years (same attributes as US1HZ050) (Source: OFR-97-131)
    USPGA250
    Polygon, arc, and point coverage of peak ground acceleration with 2% probability of exceedance in 50 years (same attributes as US1HZ050) (Source: OFR-97-0131)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Perkins, David M
    USGS-GEO-CRG-GHZ
    Mail Stop 966, USGS
    P.O. Box 25046
    Lakewood, CO
    US

    303-273-8554 (voice)
    perkins@usgs.gov

Why was the data set created?

To provide to the public a digital hazard map database of the United States.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    (process 1 of 2)
    Date: 01-Apr-2003 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Peter N Schweitzer
    U.S. Geological Survey, ER
    Geologist
    Mail Stop 954
    12201 Sunrise Valley Drive
    Reston, VA
    USA

    703-648-6533 (voice)
    703-648-6252 (FAX)
    pschweitzer@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?
    Most of the gridded data for the United States is at a spacing of 0.1 degrees latitude and longitude. The higher resolution data available for California, Nevada, and part of Arizona and Utah were used for both the U.S. and Western U.S. maps. The gridded data for this area is at a spacing of 0.05 degrees latitude and longitude.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Excludes Alaska, Hawaii, and Puerto Rico
  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: none
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286, Denver Federal Center
    Denver, Colorado
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
    infoservices@usgs.gov
  2. What's the catalog number I need to order this data set? US Geological Survey Open-File Report 97-0131
  3. What legal disclaimers am I supposed to read?
    Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS as to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 23-Feb-2015
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/97-131/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:44 2018