Base Flood Elevations - DFIRM

Metadata also available as

Frequently-anticipated questions:

What does this data set describe?

Title: Base Flood Elevations - DFIRM
Abstract:
This dataset contains line features that represent base flood elevations derived from flood insurance studies used for the flood insurance rate maps (FIRM) by the Federal Emergency Management Agency (FEMA). A base flood elevation (BFE) is the height of the base flood, usually in feet, in relation to the National Geodetic Vertical Datum of 1929, the North American Vertical Datum of 1988, or other datum referenced in the Flood Insurance Study report, or average depth of the base flood, usually in feet, above the ground surface.
Supplemental_Information:
This dataset is modified by appending new elevation data resulting from new flood insurance studies required for Letter of Map Revisions (LOMR).
  1. How should this data set be cited?

    Michael Baker, Inc, September, 2002, Base Flood Elevations - DFIRM: Clark County Regional Flood Control District, Clark County, Nevada.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -115.276067
    East_Bounding_Coordinate: -114.049873
    North_Bounding_Coordinate: 36.818856
    South_Bounding_Coordinate: 34.999340

  3. What does it look like?

    <http://www.ccrfcd.org/images/gis_metadata/bfe.jpg> (JPEG)
    Base Flood Elevations

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

    Beginning_Date: September 27, 2002
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  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):

      • String (1553)
      • Point (1)

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

      The map projection used is Transverse Mercator.

      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.999900
      Longitude_of_Central_Meridian: -115.583333
      Latitude_of_Projection_Origin: 34.750000
      False_Easting: 656166.666667
      False_Northing: 26246666.666667

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000000
      Ordinates (y-coordinates) are specified to the nearest 0.000000
      Planar coordinates are specified in survey feet

      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.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Resolution: 1.000000
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    bfe
    Base Flood Elevations (Source: Michael Baker, Inc for FEMA)

    LENGTH
    Length of feature in internal units. (Source: ESRI)

    Positive real numbers that are automatically generated.

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    LEN_UNIT
    Unit of Measure for length (Source: Unknown)

    Frequency of measurement: Unknown

    SOURCE_CIT
    Citation source (Source: Unknown)

    Frequency of measurement: Unknown

    FNODE_
    Unknown (Source: Unknown)

    Frequency of measurement: Unknown

    TNODE_
    Unknown (Source: Unknown)

    Frequency of measurement: Unknown

    LPOLY_
    Unknown (Source: Unknown)

    Frequency of measurement: Unknown

    BFE_LN_ID
    Unknown (Source: Unknown)

    Frequency of measurement: Unknown

    RPOLY_
    Unknown (Source: Unknown)

    Frequency of measurement: Unknown

    V_DATUM
    Vertical Datum Used (Source: Unknown)

    Frequency of measurement: Unknown

    BFE_
    Unknown (Source: Unknown)

    Frequency of measurement: Unknown

    ELEV
    Elevation (Source: Michael Baker, Inc)

    Frequency of measurement: As needed

    BFE_ID
    Unknown (Source: Unknown)

    Frequency of measurement: Unknown

    GID_len

    Entity_and_Attribute_Overview:
    ELEV is the only field regularly maintained by modification to the dataset.
    Entity_and_Attribute_Detail_Citation: Unknown

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?

    Michael Baker, Inc for FEMA

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

    Clark County Regional Flood Control District
    GIS Administator
    600 S. Grand Central Pkwy
    Las Vegas, Nevada 89106-4511
    USA

    702-685-0000 (voice)
    702-685-0001 (FAX)
    Administrator@regionalflood.org

    Hours_of_Service: 8:00 A.M. to 5:00 P.M. (Pacific Standard Time)

Why was the data set created?

This dataset was created for display and analysis of the base flood elevations provided by FEMA as a result of flood insurance studies in Clark County, Nevada. The field ELEV is used to denote the BFE elevation.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    , Unknown.

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

    (process 1 of 1)
    Metadata imported.

    Data sources used in this process:

    • T:\RFCD\GISDocs\Metadata Templates\bfe.shp.xml

  3. What similar or related data should the user be aware of?

    , Unknown.

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

  1. How well have the observations been checked?

    None

  2. How accurate are the geographic locations?

    None

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Unknown

  5. How consistent are the relationships among the observations, including topology?

    Unknown

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)

    Clark County Regional Flood Control District
    c/o GIS Admininstrator
    GIS Administrator
    600 S. Grand Central Pkwy
    Las Vegas, Nevada 89106-4511
    USA

    702-685-0000 (voice)
    702-685-0001 (FAX)
    adminstrator@ccrfcd.org

    Hours_of_Service: 8:00 A.M. - 5:00 P.M. (Pacific Standard 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?

    None

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    None

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

    None

Who wrote the metadata?

Dates:
Last modified: 02-Jun-2009
Metadata author:
Clark County Regional Flood Control District
GIS Administrator
600 S. Grand Central Pkwy
Las Vegas, Nevada 89106-4511
USA

702-685-0000 (voice)
702-685-0001 (FAX)
Administrator@regionalflood.org

Hours_of_Service: 8:00 A.M. to 5:00 P.M. (Pacific Standard Time)
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.6 on Tue Jun 02 13:06:40 2009