2007 JALBTCX Hawaii Lidar: North Coasts of Hawaii (Big Island), Kauai, Maui, Molokai, Oahu

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Frequently anticipated questions:


What does this data set describe?

Title:
2007 JALBTCX Hawaii Lidar: North Coasts of Hawaii (Big Island), Kauai, Maui, Molokai, Oahu
Abstract:
The data contained in these files contain topographic data collected by the CHARTS system along the northern coast of Hawaii (Big Island), Kauai, Maui, Molokai, and Oahu in the state of Hawaii. The data were collected on the following dates: Hawaii (Big Island): 20070123-20070210 Kauai: 20070112-20070210 Maui: 20070111-20070127 Molokai: 20070111-20070127 Oahu: 20070112-20070210 The data points representing bare earth have been classified as such using TerraScan with results provided in the classified las files. Classification value "1" means "Unclassified" and a value "2" means "Ground." The data were collected and processed in geographic coordinates and ellipsoid heights. The positions are relative to NAD83 HARN in decimal degrees of longitude and latitude. The heights were converted from ellipsoid to geoid (NAVD88) heights using the Geoid03 model with the results in meters. These heights were then adjusted to Mean Sea Level. The NOAA Coastal Services Center left the data in the tidal vertical datum and the Geotiff tags were updated to reflect this datum. No vertical transforms will be performed on this data during provisioning.
Supplemental_Information:
A footprint of this data set may be viewed in Google Earth at: <ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/hi/usace2007/2007_JALBTCX_Hawaii_Lidar.kmz>
  1. How should this data set be cited?

    Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX), and Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC), 20071211, 2007 JALBTCX Hawaii Lidar: North Coasts of Hawaii (Big Island), Kauai, Maui, Molokai, Oahu: NOAA's Ocean Service, Coastal Services Center (CSC), Charleston, SC.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -159.790577
    East_Bounding_Coordinate: -154.806552
    North_Bounding_Coordinate: 22.235079
    South_Bounding_Coordinate: 19.511494

  3. What does it look like?

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

    Beginning_Date: 12-Jan-2007
    Ending_Date: 10-Feb-2007
    Currentness_Reference: ground condition

  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?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00000001. Longitudes are given to the nearest 0.00000001. Latitude and longitude values are specified in Decimal Degrees.

      The horizontal datum used is GCS_North_American_1983_HARN.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.0000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: Mean Sea Level
      Altitude_Resolution: 0.01
      Altitude_Distance_Units: Meters
      Altitude_Encoding_Method:
      Explicit Elevation Coordinate Included with Horizontal Coordinates
      Depth_System_Definition:
      Depth_Datum_Name: Mean Sea Level
      Depth_Resolution: 0.01
      Depth_Distance_Units: Meters
      Depth_Encoding_Method: Explicit Depth Coordinate Included with Horizontal Coordinates

  7. How does the data set describe geographic features?


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?

    Acknowledgement of the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) would be appreciated in any publications or derived products.

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


Why was the data set created?

The purpose of the 2007 Hawaii survey, in general, was to collect both bathymetric and topographic lidar along the northern coastline of the Hawaiian Islands. Topographic data were required between the zero and 15 meter contours, nominal, for the northern coastline of the islands of Hawaii (Big Island), Kauai, Maui, Molokai, and Oahu. Bathymetric Lidar data collection was attempted in Kaneohe Bay, Oahu, to fill-in the data gaps between the shoreline and the previously collected SHOALS data. Bathymetric Lidar data were collected on the island of Hawaii from Honolii Stream south along the shoreline to the existing SHOALS data. The data were to be collected from the land water interface seaward to a depth of 40 meters or laser extinction, whichever comes first. These data were collected for Hawaii State Civil Defense for tsunami mapping purposes. The manager for this project was Milton Yoshimoto (808) 438-2250.


How was the data set created?

  1. From what previous works were the data drawn?

    Lidar (source 1 of 1)
    (comp.), JALBTCX, Unpublished Material, 2007 HI Hawaii CHARTS Survey.

    Other_Citation_Details: These data were collected by JALBTCX as project number 07006.
    Type_of_Source_Media: hard drive
    Source_Contribution: Lidar

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

    Date: 14-Nov-2007 (process 1 of 2)
    These data were collected using the CHARTS surveys system. It is owned by the Naval Oceanographic Office and Operated through contract. The system collects topographic lidar data at 20 kHz and hydrographic data at 3 kHz. The system also collects RGB imagery at 1Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well. Aircraft position, velocity and acceleration information are collected through a combination of Novatel and POS A/V equipment. Raw data are collected and transferred to the office for downloading and processing in SHOALS GCS software. GPS data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. These data are edited using Fledermaus software where anomalous data are removed from the dataset. The edited data are written to the national grid system 1 km tiles using chartsLAS, a program written by NAVO. The data are converted from ellipsoid to orthometric heights, based on the GEOID03 model, within the chartsLAS program. The LAS files output from chartsLAS were read into TerraScan and filters were applied to classify ground points. Points designated as ground are assigned a classification value "2" and all other points are assigned the classification value "1" which represents an unclassified state.

    Person who carried out this activity:

    JALBTCX
    Data Production Manager
    7225 Stennis Airport Road, STE 100
    Kiln, MS 39556
    USA

    228-252-1121 (voice)
    228-252-1133 (FAX)
    shoals-info@sam.usace.army.mil

    Hours_of_Service: 8 am to 5 pm Monday through Friday
    Data sources used in this process:
    • 03DS07006_001_070111_1818_A
    • 03DS07006_001_070114_1855_A
    • 03DS07006_002_070127_0122_A

    Date: Oct-2010 (process 2 of 2)
    The NOAA Coastal Services Center (CSC) received files in las format. The files contained LiDAR intensity and elevation measurements. CSC performed the following processing on the data for storage purposes and to make it available within Digital Coast: 1. The data were left in the tidal vertical datum and the Geotiff tags were updated to reflect this datum. No vertical transforms will be performed on this data during provisioning. 2. The LAS header fields were sorted by latitude and updated.

    Person who carried out this activity:

    NOAA Coastal Services Center
    Clearinghouse Manager
    2234 South Hobson Ave.
    Charleston, SC 29405
    US

    843-740-1210 (voice)
    clearinghouse@noaa.gov

  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?

    These data are not attributed.

  2. How accurate are the geographic locations?

    The data positions were obtained using post processed KGPS methods. The horizontal accuracy of the data is better than +/- 0.75 m.

  3. How accurate are the heights or depths?

    The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than +/- 0.20 m.

  4. Where are the gaps in the data? What is missing?

    These data covered the required survey area with minimal gaps in data coverage except near tops of mountains. These gaps are caused when the ground elevation rises so high that the lidar swath (based on maximum scan angles and altitude) from adjacent flight lines no longer overlap. These gaps are at elevations above that maximum required for this project. The data postings are very consistent with postings nominally at 1.3 m density.

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

    The data provided in this file were tested against ground truth data. At these locations the lidar data matched within 0.20 meters, and different flight line data agreed within 0.20 meters.


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:
Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.

  1. Who distributes the data set? (Distributor 1 of 1)

    NOAA Coastal Services Center
    Clearinghouse Manager
    2234 South Hobson Ave.
    Charleston, SC 29405-2413

    843-740-1210 (voice)
    clearinghouse@noaa.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Any conclusions drawn from the analysis of this information are not the responsibility of JALBTCX, the Coastal Services Center or its partners.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    This data can be obtained on-line at the following URL: <http://www.csc.noaa.gov/digitalcoast/data/coastallidar>


Who wrote the metadata?

Dates:
Last modified: 05-Jun-2014
Metadata author:
NOAA Coastal Services Center
Clearinghouse Manager
Charleston, SC 29405-2413

843-740-1210 (voice)
clearinghouse@noaa.gov

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


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