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2005 United States Army Corps of Engineers (USACE) Post-Hurricane Katrina Levee Surveys

These topographic data were collected for the U.S. Army Corps of Engineers by a helicopter-mounted LiDAR sensor over the New Orleans Hurricane Protection Levee System in Louisiana.

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    Distribution Formats
    • LAZ
    Distributor Distributor information not available
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      • publication: 2005-10-15
      Data Presentation Form: Digital image
      Dataset Progress Status Complete
      Data Update Frequency: Not planned
      Supplemental Information: System Specifications - Laser scan rate 50 hertz, laser beams per scan 200, scan rate 10,000 points per second per laser, scan angle 60 degrees, flight altitude 60 meters AGL, forward speed 15 meters per second.
      Purpose: The LiDAR data was collected to assess hurricane Katrina's damage to the levee system.
      Time Period: 2005-09-13T14272500Z  to  2005-09-18T20120300Z
      Spatial Reference System:
      Spatial Bounding Box Coordinates:
      N: 30.147603
      S: 29.269162
      E: -089.352728
      W: -090.049167
      Spatial Coverage Map:
      • Bathymetry/Topography
      • Hurricane
      • Katrina
      • Levees
      • Lidar
      • US
      • Louisiana
      • New Orleans
      Use Constraints No constraint information available
      Fees Fee information not available.
      Lineage Statement Lineage statement not available.
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Processing Steps
      • The NOAA Coastal Services Center (CSC) received files in ascii format. The files contained LiDAR elevation measurements. The xy data in the files were in LA State Plane feet and elevations were in US feet. CSC performed the following processing on the data to make it available within the LiDAR Data Retrieval Tool (LDART): 1. Each LiDAR xyz point within the ascii file was reprojected to geographic decimal degrees using GCTP and elevations were converted from U.S. survey feet to meters. The data were then converted to binary las files. Default values for which there is no corresponding input were assigned as follows for each las elevation data record: intensity = 0, retn = 1, nret = 1, class = 0. 2. The las files were sorted by latitude and the las header fields were updated. 3. Elevations converted to ellipsoid.
      • The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp transfer from the NOAA Coastal Services Center. The data are currently being served via NOAA CSC Digital Coast at The data can be used to re-populate the system. The data are archived in LAS or LAZ format. The LAS format is an industry standard for LiDAR data developed by the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version of LAS developed by Martin Isenburg ( The data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most up to date geoid model when transforming to orthometric heights.

      Metadata Last Modified: 2013-06-12

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