Hydrography Breakline Data, SW quadrant of Lake Charles Southeast quadrangle, Louisiana, UTM 15 NAD83, Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Calcasieu Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 012. [bsh_3009364sw.gen]

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?

Title:

Hydrography Breakline Data, SW quadrant of Lake Charles Southeast quadrangle, Louisiana, UTM 15 NAD83, Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Calcasieu Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 012. [bsh_3009364sw.gen]

Abstract:

This is a dataset of select hydrography breaklines over the SW quadrant of the Lake Charles Southeast quadrangle, Louisiana. The breaklines represent the water edge for wide channel rivers and canals, and the shoreline of lakes.

These data were produced for the Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Calcasieu Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 012.

BSH breaklines define drainage features whose distance from channel bank to channel bank are less than 50 feet (15 meters).

The data are provided in ArcInfo 'generate' format suitable for input into a TIN model.

Supplemental_Information:

The metadata for this image are encapsulated into several documents. The metadata are not complete if you did not receive the following files along with the data set:

bsh_3009364sw.mtd - this metadata in mp (metadata parser) compatible ASCII text form
bsh_3009364sw.html - this metadata in HTML form
bsh_3009364sw_faq.html - this metadata presented as Questions and Answers
bsh_3009364sw.sgml - this metadata in SGML form
bsh_3009364sw.xml - this metadata in XML form

The information depicted on this map are the results of the survey on the dates indicated and can only be considered as indicating the general conditions existing at the time.

1. How should this data set be cited?

   Concepts, Watershed, 2003, Hydrography Breakline Data, SW quadrant of Lake Charles Southeast quadrangle, Louisiana, UTM 15 NAD83, Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Calcasieu Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 012. [bsh_3009364sw.gen].

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -90.5625

   East_Bounding_Coordinate: -90.5000

   North_Bounding_Coordinate: +30.9375

   South_Bounding_Coordinate: +30.8750

3. What does it look like?

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

   Calendar_Date: 2003

   Currentness_Reference: Date these breakline data were developed

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

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 15

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: -93.000000

      Latitude_of_Projection_Origin: +00.000000

      False_Easting: 500000

      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      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.
      The flattening of the ellipsoid used is 1/298.257.
      

      Vertical_Coordinate_System_Definition:

      Altitude_System_Definition:

      Altitude_Datum_Name: North American Vertical Datum of 1988

      Altitude_Resolution: 0.01

      Altitude_Distance_Units: Survey Feet

      Altitude_Encoding_Method: Attribute values

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   The data consist of a series of arcs represented as a list of xyz coordinates for vertices. All the arcs are coded to represent 'hard' breaklines.

   Entity_and_Attribute_Detail_Citation: ArcInfo on-line help, the 'generate' section for CREATETIN.

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

2. Who also contributed to the data set?

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

   Watershed Concepts
   c/o David Key, P.E.
   3333 Regency Parkway, Suite 120
   Cary, North Carolina 27511
   

   (919)868-5155 (voice)
   

These data improve the representation of terrain in an elevation model where point data is insufficient to provide a good representation, where flow channels are blocked from (LIDAR) view by vegetation, and where minor variations in sensed surface elevation would otherwise give rise to contours in and across large water bodies.

1. From what previous works were the data drawn?

   RAW_3009364sw (source 1 of 2)

   Concepts, Watershed, 2003, Raw LIDAR Elevation Data, SW quadrant of Lake Charles Southeast quadrangle, Louisiana, UTM 15 NAD83, Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Calcasieu Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 012. [raw_3009364sw.csv].

   Type_of_Source_Media: computer file

   Source_Contribution: Raw LIDAR data from which this data set was derived

   GEOTIFF (source 2 of 2)

   Louisiana Oil Spill Coordinator's Office (LOSCO), and United States Geological Survey (USGS), 2000, Color Infrared Orthophotography of Louisiana, LOSCO, USGS (2000).

   Type_of_Source_Media: computer file

   Source_Contribution: Reference data set for water body selection and delineation

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

   Date: 2003 (process 1 of 3)

   RAW_3009364sw data was edited using ELVIS software to eliminate above-ground features such as buildings, trees and overpasses.

   Person who carried out this activity:
   

   3001, Inc.
   LIDAR Manager
   5525 Mounes, Suite 102
   New Orleans, LA 70123
   

   (504) 733-3001 (voice)
   

   Date: 2003 (process 2 of 3)

   TerraModeler software was used to display the reference GeoTIFF orthophotos and the ELVIS edited raw_3009364sw LIDAR point data and to construct breaklines for the water edge of wide channel rivers and canals, and the shoreline of lakes. Breakline elevations were linearly ramped between identified critical elevation points along flowing water courses or were set at a fixed level for lakes based on lowest observed shoreline elevation or water return elevation. The breakline data from individual 3.75' tiles are edgematched into regional breaklines, clipped to an exact 3.75 minute tile then converted to a format suitable for 'generate' input in an ArcInfo CREATETIN process.

   (process 3 of 3)

   Metadata imported.

   Data sources used in this process:

   • N\A

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

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?

   This data set models rivers and canals that consistently meet or exceed 25 meters in width and lakes or ponds that are 50 or more meters in length along the long axis.

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

   The breaklines were constructed under the model representation that water courses vary linearly in elevation or are constant in elevation between critical points established in the breakline model. These breaklines were determined from LIDAR and orthophoto data of specific dates and that model the land/water contributions and extents on those dates.

Are there legal restrictions on access or use of the data?

Access_Constraints: none

Use_Constraints:

These unaltered data may not be redistributed without all of the elements of the metadata listed in the Supplemental_Information section of this metadata document.

Dates:

Last modified: 20-Jun-2003

Metadata author:

3001, Inc.
5525 Mounes Street, Suite 102
New Orleans, LA 70123

(504) 733-3001 (voice)
(504) 734-8938 (FAX)

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)