2007 JALBTCX Topographic Lidar: Saipan, CNMI

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Frequently anticipated questions:

What does this data set describe?

Title: 2007 JALBTCX Topographic Lidar: Saipan, CNMI
These files contain topographic lidar data collected by the CHARTS system in Saipan, CNMI. This file contains both first and lastreturns. The data points representing bare earth have been classified as such using TerraScan. Classification values are:Class 1: UnclassifiedClass 2: Ground
This data set was collected for the CNMI Coastal Resources Management Office, CNMI Department of Public Works, and the CNMI Emergency ManagementOffice. The U.S. Army Corps of Engineers, Honolulu District project manager was Milton Yoshimoto (contact number: 808-438-2250).A footprint of this data set may be viewed in Google Earth at:<ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/cnmi/2007_JALBTCX_Topo_Saipan_Lidar.kmz>
  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), and Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX), 20071211, 2007 JALBTCX Topographic Lidar: Saipan, CNMI: NOAA's Ocean Service, Coastal Services Center (CSC), Charleston, SC.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 145.689546
    East_Bounding_Coordinate: 145.830793
    North_Bounding_Coordinate: 15.290357
    South_Bounding_Coordinate: 15.091355

  3. What does it look like?

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

    Beginning_Date: 06-May-2007
    Ending_Date: 09-May-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 WGS 1984.
      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.

      Altitude_Datum_Name: Mean Sea Level
      Altitude_Resolution: 0.01
      Altitude_Distance_Units: Meters
      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?

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

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

Why was the data set created?

The purpose of this survey is to collect topographic lidar across the island of Saipan to support the production of 2-foot contours.

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 CNMI Saipan 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 system. It is owned by the Naval Oceanographic Office (NAVO) and operated through contract.The system collects topographic lidar data at 20kHz and hydrographic data at 3kHz. 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 arecollected through a combination of Novatel and POS A/V equipment. Raw data are collected and transferred to the office for downloading andprocessing in SHOALS GCS software. GPS data are processed using POSPac software and the results are combined with the lidar data to produce 3-Dpositions for each lidar shot. These data are edited using Fledermaus software where anomalous data are removed from the dataset. The edited dataare written to the national grid system 1 km tiles using chartsLAS, a program written by NAVO. This program reads data from the original binaryformat files and produces separate ASCII files for first and last return data. Using a model calculated by NAVO, data were converted fromellipsoid to Mean Sea Level heights using the program datum_shift, written by NAVO. The model file Saipan_Adjustment.fin was used forthe corrections. The LAS files output form chartsLAS were read into TerraScan and filters were applied to classify ground points. Points designatedas ground are assigned a classification value "2" and all other points are assigned the classification value "1" which represents an unclassifiedstate.

    Person who carried out this activity:

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

    228-252-1103 (voice)
    228-252-1133 (FAX)

    Hours_of_Service: 8 am to 5 pm Monday through Friday
    Date: Dec-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 and provisioning purposes within Digital Coast:1. The data were converted from UTM coordinates to geographic coordinates (WGS84).2. The LAS georeferencing information was updated to reflect the tidal vertical datum Mean Sea Level (MSL).3. The LAS headers were updated and sorted by latitude.

    Person who carried out this activity:

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

    843-740-1210 (voice)

  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 +/- 0.75m.

  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 +/- 0.20m.

  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 groundelevation rises so steeply that the lidar swath (based on maximum scan angles and altitude) from adjacent flight lines no longer overlap. These gapsare at elevations above the maximum required for this project. The data postings are very consistent with nominal posting density of 1.3 meters.

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

    The data provided in this file were tested against ground truthed data. At these locations the lidar data matched within 0.20 meters, and differentflight 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
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 representactual 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)

  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/lidar>

Who wrote the metadata?

Last modified: 17-Jul-2014
Metadata author:
NOAA Coastal Services Center
Clearinghouse Manager
Charleston, SC 29405-2413

843-740-1210 (voice)

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

Generated by mp version 2.9.13 on Mon Nov 24 10:42:45 2014