500-Year Flood Zones - DFIRM

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   FEMA, September, 2002, 500-Year Flood Zones - DFIRM: Clark County Regional Flood Control District, Las Vegas, Nevada.

   Online Links:

   • <ftp://www.ccrfcd.org/Shapefiles/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -115.358633

   East_Bounding_Coordinate: -114.105258

   North_Bounding_Coordinate: 36.809502

   South_Bounding_Coordinate: 35.110230

3. What does it look like?

   <http://www.ccrfcd.org/images/gis_metadata/shadedx.jpg> (JPEG)

   500-Year Flood Zones - DFIRM

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

   Calendar_Date: 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 (170)
      • Label point (209)
      • GT-polygon composed of chains (209)
      • 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 0.000369
      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.SHADEDX_P

   500-year flood zones (Source: FEMA)

   GISMO.RFCGIS.SHADEDX_P.AREA

   Area (Source: CCRFCD)

   Frequency of measurement: As needed

   PERIMETER

   SHADEDX_

   SHADEDX_ID

   MINOR1

   FEMA flood zone code (Source: FEMA)

   Frequency of measurement: Unknown

   Value	Definition
   160	500-year flood zone

   GID

   ObjectID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   GID.area

   Area (Source: CCRFCD)

   GID.len

   Entity_and_Attribute_Overview:

   To display 500-year flood zones select polygons where the MINOR1 field contains a value of 160.

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • FEMA

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 analysis of 500-year flood zones in Clark County, Nevada.

How was the data set created?

1. From what previous works were the data drawn?

   (source 1 of 1)

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

   Date: Unknown (process 1 of 3)

   (process 2 of 3)

   Metadata imported.

   Data sources used in this process:

   • C:\DOCUME~1\STANCR~1.CCR\LOCALS~1\Temp\xml26.tmp

   (process 3 of 3)

   Metadata imported.

   Data sources used in this process:

   • T:\RFCD\GISDocs\Metadata Templates\shadedx.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?
   • Availability in digital form:

     Data format:	Size: 0.945
     Network links:	<ftp://www.ccrfcd.org/Shapefiles>

   • Cost to order the data: None

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: 29-Sep-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:

• <http://www.esri.com/metadata/esriprof80.html>