F4100300001D.TIF - FEMA Flood Insurance Rate Maps for the Seaside-Gearhart, Oregon, Area: Gearhart

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Frequently anticipated questions:


What does this data set describe?

Title:
F4100300001D.TIF - FEMA Flood Insurance Rate Maps for the Seaside-Gearhart, Oregon, Area: Gearhart
Abstract:
FEMA's Flood Insurance Rate Map (FIRM) depicts the spatial extent of Special Flood Hazard Areas (SFHAs) and other thematic features related to flood risk assessment. FIRMs also provide a basis for establishing flood insurance coverage premium rates offered through the National Flood Insurance Program (NFIP). These maps were published as paper documents, which have been scanned into image files (TIFF) as part of FEMA's FIRM modernization process. This is one of three scanned maps for the Seaside-Gearhart area - 410030 0001 D, 410032 0001 C, and 410032 0002 C - that were georeferenced for the probabilistic tsunami hazard assessment project.
Supplemental_Information:
The following explanatory text was transcribed from Flood Insurance Rate Map 410027 0019 B, Clatsop County (Unincorporated Areas), revised June 16, 1999 (FEMA, 1999).
Elevations referenced to the National Geodetic Vertical Datum of 1929 (NGVD29).
Zone A: Areas of 100-year flood; base flood elevations and flood hazard factors not determined.
Zone A0: Areas of 100-year shallow flooding where depths are between one (1) and three (3) feet; average depths of inundation are shown, but no flood hazard factors are determined.
Zone AH: Areas of 100-year shallow flooding where depths are between one (1) and three (3) feet; base flood elevations are shown, but no flood hazard factors are determined.
Zone A1-A30: Areas of 100-year flood; base flood elevations and flood hazard factors determined.
Zone A99: Areas of 100-year flood to be protected by flood protection system under construction; base flood elevations and flood hazard factors not determined.
Zone B: Areas between limits of the 100-year flood and 500-year flood; or certain areas subject to 100-year flooding with average depths less than one (1) foot or where the contributing drainage area is less than one square mile; or areas protected by levees from the base flood. (Medium shading)
Zone C: Areas of minimal flooding. (No shading)
Zone D: Areas of undetermined, but possible, flood hazards.
Zone V: Areas of 100-year coastal flood with velocity (wave action); base flood elevations and flood hazard factors not determined.
Zone V1-V30: Areas of 100-year coastal flood with velocity (wave action); base flood elevations and flood hazard factors determined.
  1. How might this data set be cited?
    Federal Emergency Management Administration, and Wong, Florence L., 2006, F4100300001D.TIF - FEMA Flood Insurance Rate Maps for the Seaside-Gearhart, Oregon, Area: Gearhart: Data Series 236, U.S. Geological Survey, Coastal and Marine Geology Program, Western Coastal and Marine Geology, Menlo Park, California.

    Online Links:

    This is part of the following larger work.

    Wong, Florence L., Venturato, Angie J., and Geist, Eric L., 2006, Seaside, Oregon, Tsunami Pilot Study - Modernization of FEMA Flood Hazard Maps: GIS Data: Data Series 236, U.S. Geological Survey, Menlo Park, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -123.930728
    East_Bounding_Coordinate: -123.898978
    North_Bounding_Coordinate: 46.038680
    South_Bounding_Coordinate: 46.013240
  3. What does it look like?
    http://pubs.usgs.gov/ds/2006/236/metadata/f41003.jpg (JPEG)
    FEMA Flood Insurance Rate Maps for the Seaside-Gearhart, Oregon, Area
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1981
    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 Raster data set. It contains the following raster data types:
      • Dimensions 5598 x 4851 x 1, type Pixel
    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: 0.999600
      Longitude_of_Central_Meridian: -123.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 0.500000
      Ordinates (y-coordinates) are specified to the nearest 0.500000
      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?
    Entity_and_Attribute_Overview: Raster image of FEMA Flood Insurance Rate Map
    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)
    • Federal Emergency Management Administration
    • Florence L. Wong
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Florence L. Wong
    U.S. Geological Survey
    Geologist
    345 Middlefield Road, MS 999
    Menlo Park, California
    USA

    650-329-5327 (voice)
    650-329-5190 (FAX)
    fwong@usgs.gov

Why was the data set created?

This data set is one of a collection of digital files of a geographic information system of spatially referenced data related to the Seaside, Oregon, Tsunami Pilot Study.
Federal Emergency Management Agency (FEMA) Federal Insurance Rate Map (FIRM) guidelines do not currently exist for conducting and incorporating tsunami hazard assessments that reflect the substantial advances in tsunami research achieved in the last two decades (Tsunami Pilot Study Working Group, 2006). Therefore, as part of FEMAs Modernization Program, a Tsunami Pilot Study was carried out in the Seaside/Gearhart, Oregon, area to provide information from which tsunami mapping guidelines could be developed. This area was chosen because it is typical of coastal communities in the section of the Pacific Coast from Cape Mendocino to the Strait of Juan de Fuca. There was also considerable interest shown by state agencies and local stakeholders in mapping the tsunami threat to this area. The study was an interagency effort by scientists from the U.S. Geological Survey, the National Oceanic and Atmospheric Administration, the University of Southern California, and the Middle East Technical University. We present the GIS data from that report in this publication.
These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.

How was the data set created?

  1. From what previous works were the data drawn?
    FEMA, 1999 (source 1 of 1)
    Federal Emergency Management Administration, 1999, City of Gearhart, Oregon, Clatsop County: FEMA Flood Insurance Rate Map Community-panel number 410030 0001 D.

    Other_Citation_Details:
    scale: 1 inch = 600 feet: 1:7,200; initial identification: December 7, 1973; Flood hazard boundary map revision: December 19, 1975; Flood insurance rate map effective: May 15, 1978; Flood insurance rate map revisions: January 3, 1983; Map revised June 16, 1999 to update corporate limits, to add base flood elevations, to add special flood hazard areas, and to change zone designations
    Type_of_Source_Media: digital image of paper map
    Source_Scale_Denominator: 7200
    Source_Contribution: map
  2. How were the data generated, processed, and modified?
    Date: 2005 (process 1 of 1)
    TIFF images of paper FEMA Flood Insurance Rate Maps were registered to USGS Digital Raster Graphics images for the Seaside-Gearhart, Oregon, area using a second-order polynomial transformation and saved as an Arc grid. The grid was clipped to the data area and converted to a TIFF (.tif) image.
  3. What similar or related data should the user be aware of?
    Tsunami Pilot Study Working Group, 2006, Seaside, Oregon Tsunami Pilot Study - Modernization of FEMA Flood Hazard Maps: Open-File Report 2006-1234, U.S. Geological Survey, Menlo Park, California.

    Online Links:


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

  1. How well have the observations been checked?
    Data set is a raster image and contains no attribute information.
  2. How accurate are the geographic locations?
    The FEMA Flood Insurance Rate Map images presented here are georeferenced to USGS DRGs for comparison to data produced by probabilistic tsunami hazard assessment (PTHA). The exact placement of any geographic feature as portrayed in these edited images has not been verified.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete.
  5. How consistent are the relationships among the observations, including topology?
    No tests for logical consistency were conducted

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 data, digital results, GIS layers, and map products in this database have been created specifically as part of a pilot study for FEMA's modernization of Flood Insurance Rate Maps (FIRMs) project. The results of the pilot study are intended to help FEMA draft new guidelines related to tsunami flooding for Coastal Flood Hazard Analysis and Mapping for the Pacific Coast of the United States. The results are intrinsically probabilistic and designed according to FEMA flood zone specifications: annual probabilities of exceedance of 1% and 0.2%. The data, digital results, GIS layers, and map products are not intended for other uses. In particular, the 1% and 0.2% annual exceedance probability tsunami flood maps are not to be used for emergency planning, evacuation, or other insurance purposes. Please refer to the National Tsunami Hazard Mitigation Program tsunami inundation maps for use in emergency planning.
These data are not to be used for navigation purposes. Mariners should refer to the appropriate nautical chart.
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Information Services
    Denver, Colorado
    USA

    1-888-275-8747 (voice)
    infoservices@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data: U.S. Geological Survey Data Series 236
  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: 26-Jul-2006
Metadata author:
U.S. Geological Survey
Attn: Florence L. Wong
Geologist
345 Middlefield Road, MS 999
Menlo Park, California
USA

650-329-5327 (voice)
650-329-5190 (FAX)
fwong@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/westcoast/oregon/seaside/f4100300001d.tif.faq.html>
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