Current 100-Year Flood Zones - DFIRM

Metadata also available as

Frequently-anticipated questions:

What does this data set describe?

Title: Current 100-Year Flood Zones - DFIRM
Abstract:
This dataset contains polygons representing current 100-year flood zones defined by the Federal Emergency Management Agency. The dataset was created as a result of a flood insurance restudy of Clark County, Nevada commissioned by FEMA and completed in September, 2002.
Supplemental_Information:
This dataset is modified with the issuance of Letters of Map Revision from FEMA. Areas are either added or removed from 100-year flood zones.
  1. How should this data set be cited?

    Michael Baker, Inc for FEMA, September, 2002, Current 100-Year Flood Zones - DFIRM: Clark County Regional Flood Control District, Las Vegas, Nevada.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -115.898800
    East_Bounding_Coordinate: -114.030977
    North_Bounding_Coordinate: 36.855225
    South_Bounding_Coordinate: 34.996083

  3. What does it look like?

    <http://www.ccrfcd.org/images/gis_metadata/fzcur.jpg> (JPEG)
    100-Year Flood Zones - DFIRM

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

    Beginning_Date: September, 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):

      • G-polygon (716)
      • Label point (742)
      • GT-polygon composed of chains (741)
      • 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 0.000328
      Ordinates (y-coordinates) are specified to the nearest 0.000328
      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?

    gismo.RFCGIS.fzcur_p
    Current 100-Year flood zones within Clark County (Source: Michael Baker, Inc. for FEMA)

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    gismo.RFCGIS.fzcur_p.AREA
    Manually calculted area (Source: CCRFCD)

    Frequency of measurement: As needed

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    PERIMETER

    FZCUR_

    MINOR1
    Flood Zone Designation (Source: FEMA - Michael Baker)

    Frequency of measurement: Unknown

    ValueDefinition
    150Zone V
    151Zone VE
    152Zone A
    153Zone AE
    154Zone AO
    155Zone AO (Alluvial Fan)
    156Zone AH
    157Zone A99
    158Zone D

    FLOODWAY
    Is the polygon in a floodway? (Source: FEMA - Michael Baker)

    ValueDefinition
    TTrue - polygon is in a floodway

    FZCUR_ID

    FZONE
    Translated to text from Minor1 field (Source: CCRFCD)

    Frequency of measurement: As needed

    Sequential unique whole numbers that are automatically generated.

    GID_area
    Internally calculated area (Source: ESRI)

    Frequency of measurement: Unknown

    GID_len
    Internally calculated length (Source: ESRI)

    Frequency of measurement: Unknown

    Shape.area
    Internaly calculted area (Source: ESRI)

    Frequency of measurement: Unknown

    Shape.len
    Internally calculated length (Source: ESRI)

    Frequency of measurement: Unknown

    Entity_and_Attribute_Overview:
    To display 100-year flood zones draw only polygons where the MINOR1 field contains a value in the rainge of 150-158. Do not draw polygons with a MINOR1 value of 999999.
    Entity_and_Attribute_Detail_Citation: NA

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

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

    Clark County Regional Flood Control District
    Systems 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)

Why was the data set created?

This dataset was created for display and/or analysis of the current 100-year flood zones in Clark County, Nevada. It is usually displayed by selecting the MINOR1 field using values in the range of 150-159.

How was the data set created?

  1. From what previous works were the data drawn?

    None (source 1 of 1)
    Type_of_Source_Media: None
    Source_Scale_Denominator: None
    Source_Contribution: None

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

    Date: Unknown (process 1 of 2)
    None

    Person who carried out this activity:

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

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

    (process 2 of 2)
    Metadata imported.

    Data sources used in this process:

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

  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?

    None

  2. How accurate are the geographic locations?

    None

  3. How accurate are the heights or depths?

    None

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

    None

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

    None

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
    Systems 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)
  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: 15-Jun-2009
Metadata author:
Clark County Regional Flood Control District
Systems 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 Mon Jun 15 13:22:07 2009