Areas Modified by Letter of Map Revision

Metadata also available as

Frequently-anticipated questions:

What does this data set describe?

Title: Areas Modified by Letter of Map Revision
Abstract:
This dataset contains polygons representing areas within Clark County, Nevada that have been modified (removed, added or structure) by Letters of Map Revision (LOMR) issued by the Federal Emergency Management Agency (FEMA). The data is created from linework provided by the engineering firm contracted by FEMA to produce the Flood Insurance Rate Maps (FIRM) and the Digital Flood Insurance Rate Maps (DFIRM) for Clark County.
  1. How should this data set be cited?

    Clark County Regional Flood Control District, September 27, 2002, Areas Modified by Letter of Map Revision: NA NA, Clark County Regional Flood Control District, Clark County, Nevada.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -115.898864
    East_Bounding_Coordinate: -114.049046
    North_Bounding_Coordinate: 36.855239
    South_Bounding_Coordinate: 35.951204

  3. What does it look like?

    <http://www.ccrfcd.org/images/gis_metadata/lomr.jpg> (JPEG)
    Areas Modified by Letter of Map Revision

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

    Beginning_Date: 1909
    Beginning_Time: unknown
    Ending_Date: unknown
    Ending_Time: unknown
    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 (1376)

    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 0.000369
      Ordinates (y-coordinates) are specified to the nearest 0.000369
      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.LOMR_P
    Areas modified by Letter of Map Revision (Source: Regional Flood Control District)

    OLDCASENO
    Reference to the case number revalidated by the 2002 restudy of Clark County (Source: FEMA)

    Frequency of measurement: As needed

    PERIMETER
    Internal (Source: ESRI)

    REVDATE
    Revision date of the case number (Source: FEMA)

    Frequency of measurement: As needed

    GISMO.RFCGIS.LOMR_P.AREA

    CSE00_981V_

    CASE_NO
    Letter of Map Revision case number (Source: FEMA)

    Frequency of measurement: As needed

    CSE00_981V_ID

    CHNGAREA
    Type of change defined by Letter of Map Revision (Source: FEMA)

    Frequency of measurement: As needed

    ValueDefinition
    RemovedArea was removed from the 100-year flood zone
    AddedArea was added to the 100-year flood zone
    StructureStructure only was removed from the 100-year flood zone - property remains in the 100-year flood zone

    GID

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    GID.area

    GID.len

    Entity_and_Attribute_Overview:
    Use the CHNGAREA field to display areas removed, added or structure.

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?

    Clark County Regional Flood Control District

  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 interrogation of areas within Clark County, Nevada modfied (added, removed or structure) by Letter of Map Revision issued by FEMA . It is usually displayed using the CHNGAREA field.

How was the data set created?

  1. From what previous works were the data drawn?

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

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

    (process 1 of 3)
    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

    Hours_of_Service: 8:00 A. M. - 5:00 P. M. Pacific Standard Time
    (process 2 of 3)
    Metadata imported.

    Data sources used in this process:

    • T:\RFCD\shapes\lomr.shp.xml

    (process 3 of 3)
    Metadata imported.

    Data sources used in this process:

    • T:\RFCD\GISDocs\Metadata Templates\lomr.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?

    NA

  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?

    GIS Software

Who wrote the metadata?

Dates:
Last modified: 24-Sep-2009
Last Reviewed: 1909
To be reviewed: As needed
Metadata author:
Clark County Regional Flood Control District
GIS Administrator
600 S. Grand Central Pkwy
Las Vegas, Nevada 89106-4511

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

Hours_of_Service: 8 A.M. to 5 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 Thu Sep 24 12:52:40 2009