Raw LIDAR Elevation Data, NE quadrant of Steep Gully quadrangle, Louisiana, UTM 15 NAD83, Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Rapides Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 013. [raw_3009202ne.csv]

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:

Raw LIDAR Elevation Data, NE quadrant of Steep Gully quadrangle, Louisiana, UTM 15 NAD83, Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Rapides Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 013. [raw_3009202ne.csv]

Abstract:

This is a point dataset of elevations over the NE quadrant of the Steep Gully quadrangle, Louisiana. The data were derived from LIDAR measurements performed in 2002. The data are 'raw' to the extent that they have not been reduced to a 'bare ground' representation; above ground-level features and objects such as buildings and trees are still present in these data.

These data were produced for the Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisisana LIDAR Data Development: Rapides Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 013.

The data are provided as a comma delimited xyz file (raw_3009202ne.csv) in ASCII format.

Supplemental_Information:

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

raw_3009202ne.mtd - this metadata in mp (metadata parser) compatible ASCII text form
raw_3009202ne.html - this metadata in HTML form
raw_3009202ne_faq.html - this metadata presented as Questions and Answers
raw_3009202ne.sgml - this metadata in SGML form
raw_3009202ne.xml - this metadata in XML form

The information depicted on this map represents 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, Raw LIDAR Elevation Data, NE quadrant of Steep Gully quadrangle, Louisiana, UTM 15 NAD83, Louisiana Federal Emergency Management Agency (FEMA) Project - Phase 2 of Louisiana LIDAR Data Development: Rapides Parish, Louisiana under the Watershed Concepts contract number EMT-2002-CO-0048, Task Order 013. [raw_3009202ne.csv].

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: Feb-2002

   Currentness_Reference:

   Approximate date of LIDAR survey used to build the source data for this data set

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?

      This is a Point data set. It contains the following vector data types (SDTS terminology):

      • entity point

   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 0.00001
      Ordinates (y-coordinates) are specified to the nearest 0.00001
      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?

   raw_3009202ne.pat

   attributes of points

   elev (and column 3 of raw_3009202ne.csv)

   elevation of point in survey feet, relative to the NAVD88 vertical datum

   x-coord (and column 1 of raw_3009202ne.csv)

   UTM zone 15 easting in meters, NAD83

   y-coord (and column 2 of raw_3009202ne.csv)

   UTM zone 15 northing in meters, NAD83

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 are the starting point for the production of 'bare-ground' digital elevation models.

1. From what previous works were the data drawn?

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

   Date: Feb-2002 (process 1 of 2)

   Raw LIDAR data from flights covering the area were seamed to remove overlap areas, corrected to local ground control, and calculated to NAVD88 elevations using Corpscon.

   Person who carried out this activity:
   

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

   (504) 733-3001 (voice)
   

   (process 2 of 2)

   Metadata imported.

   Data sources used in this process:

   • L:\Task13\metadata\Template\raw_template.xml

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?

   The data set includes all the LIDAR data obtained over the 3.75 minute cell area except in those areas where multiple flight lines had overlap. In these areas, only the data from the flight yielding data closest to nadir were retained for this data set.

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

   These data have been checked and adjusted against ground control elevation points.

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) 733-8938 (FAX)

Metadata standard:

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