2006 FEMA Lidar: Hawaiian Islands

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Frequently anticipated questions:


What does this data set describe?

Title: 2006 FEMA Lidar: Hawaiian Islands
Abstract:
The FEMA Task Order 26 LiDAR data set was collected by Airborne 1 Corporation of El Segundo, California in September - December of 2006 for URS Corp.
  1. How should this data set be cited?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC), 20121024, 2006 FEMA Lidar: Hawaiian Islands: NOAA's Ocean Service, Coastal Services Center (CSC), Charleston, SC.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -156.093530
    East_Bounding_Coordinate: -154.787886
    North_Bounding_Coordinate: 20.289024
    South_Bounding_Coordinate: 18.899411

  3. What does it look like?

    <http://csc.noaa.gov/htdata/lidar1_z/geoid12a/data/1393/supplemental/2006_hi_fema_geo_footprint.kmz> (kmz)
    This graphic shows the lidar coverage for the southern shores of Hawaii, Oahu, Kauai, Maui, Molokai and Lanai.

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

    Beginning_Date: Sep-2006
    Ending_Date: Dec-2006
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: las

  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.

    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 0.0000001. Longitudes are given to the nearest 0.0000001. Latitude and longitude values are specified in Decimal degrees.

      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_Datum_Name: Ellipsoid
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation 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?

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

    Dewberry
    8401 Arlington Blvd
    Fairfax, VA 22031
    USA

    703.849.0100 (voice)


Why was the data set created?

This data set was collected to create digital elevation models of the southern shores of Hawaii.


How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 2006 (process 1 of 2)
    Lidar data were collected by Airborne 1 under subcontract to URS by FEMA. Data were checked for quality by Dewberry and Davis.

    Date: 10-Oct-2012 (process 2 of 2)
    Lidar data were processed by Coastal Services Center for incorporation into the Digital Coast. Coordinates were converted to geographic latitude and longitude using the General Cartographic Transform Program algorithms. Elevations were converted from orthometric heights to heights on the NAD83 ellipsoid using the NGS GEOID03 model. Height units were converted to meters from feet.

    Person who carried out this activity:

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

    843-740-1200 (voice)
    csc.info@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?

    Not available beyond what is reported for positional accuracy.

  2. How accurate are the geographic locations?

    68.2% of laser returns are accurate to .30 meters (1 foot). This is assessed by the laser manufacturer and is a product of flying height (1/3000th of flying height).

  3. How accurate are the heights or depths?

    The islands of Oahu, Kauai, and Hawaii were tested and found to have the following accuracies. Kauai LiDAR dataset tested .98ft vertical accuracy at 95% confidence level in open terrain, based on open terrain RMSEz (.50ft) x 1.9600; tested .88ft vertical accuracy at 95% confidence level in all land cover categories combined, based on consolidated RMSEz (.45ft) x 1.9600. Oahu LiDAR dataset tested .69ft vertical accuracy at 95% confidence level in open terrain, based on open terrain RMSEz (.35ft) x 1.9600; tested .73ft vertical accuracy at 95% confidence level in all land cover categories combined, based on consolidated RMSEz (.37ft) x 1.9600. Hawaii LiDAR dataset tested .51ft vertical accuracy at 95% confidence level in open terrain, based on open terrain RMSEz (.26ft) x 1.9600; tested .69ft vertical accuracy at 95% confidence level in all land cover categories combined, based on consolidated RMSEz (.35ft) x 1.9600. Independent accuracy testing was performed by Dewberry & Davis using 80 high accuracy quality control checkpoints distributed throughout the project in four major land cover types (open terrain, weeds/crops, forest, urban). Dewberry used testing procedures consistent with those specified in the National Standard for Spatial Data Accuracy (NSSDA) as well as LiDAR accuracy testing guidelines and specifications published by the Federal Emergency Management Agency (FEMA), National Digital Elevation Program (NDEP), and American Society for Photogrammetry and Remote Sensing (ASPRS).

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

    Accuracy was ensured with an independent quality assurance evaluation.

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

    Unknown


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. These data depict the heights at the time of the survey and are only accurate for that time.

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

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

    843-740-1202 (voice)
    csc.info@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 FEMA, NOAA, 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/dataviewer/index.html?action=advsearch&qType=in&qFld=ID&qVal=1393>


Who wrote the metadata?

Dates:
Last modified: 17-Jul-2014
Metadata author:
NOAA Coastal Services Center
2234 South Hobson Ave.
Charleston, SC 29405-2413

843-740-1202 (voice)
csc.info@noaa.gov

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


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