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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 last returns. The data points representing bare earth have been classified as such using TerraScan. Classification values are: Class 1: Unclassified Class 2: Ground

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    Distribution Formats
      Distributor NOAA Coastal Services Center
      Documentation links not available.
      Originator
      • Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC)
      Originator
      • Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX)
      Publisher
      • NOAA's Ocean Service, Coastal Services Center (CSC)
      Date(s)
      • publication: 2007-12-11
      Dataset Progress Status Complete
      Data Update Frequency: As needed
      Supplemental Information: This data set was collected for the CNMI Coastal Resources Management Office, CNMI Department of Public Works, and the CNMI Emergency Management Office. 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
      Purpose: The purpose of this survey is to collect topographic lidar across the island of Saipan to support the production of 2-foot contours.
      Use Limitations
      • Any conclusions drawn from the analysis of this information are not the responsibility of JALBTCX, the Coastal Services Center, or its partners. Disclaimer While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
      Time Period: 2007-05-06  to  2007-05-09
      Spatial Reference System: urn:ogc:def:crs:EPSG::4326 urn:ogc:def:crs:EPSG::5715
      Spatial Bounding Box Coordinates:
      N: 15.290357
      S: 15.091355
      E: 145.830793
      W: 145.689546
      Spatial Coverage Map:
      Themes
      • Bathymetry/Topography
      • Lidar
      • Elevation
      Places
      • United States Territory
      • Commonwealth of the Northern Marianas Islands (CNMI)
      • Saipan
      Use Constraints
      • 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.
      Access Constraints
      • Access Constraints: None
      Fees Fee information not available.
      Source Datasets
      • 2007 CNMI Saipan CHARTS Survey
        • Description of Source: Source Contribution: LidarSource Type: hard drive
        • Temporal extent used:  2007-05-06  to  2007-05-09
      Lineage Statement Lineage statement not available.
      Processor
      • JALBTCX
      • NOAA Coastal Services Center
      • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
      Processing Steps
      • 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 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. This program reads data from the original binary format files and produces separate ASCII files for first and last return data. Using a model calculated by NAVO, data were converted from ellipsoid to Mean Sea Level heights using the program datum_shift, written by NAVO. The model file Saipan_Adjustment.fin was used for the corrections. The LAS files output form 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.
      • 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.
      • The NOAA National Geophysical Data Center (NGDC) received Lidar data files by ftp. The data received compressed containing LiDAR data from the NOAA Coastal Services Center. The data are currently being served via Digital Coastl at http://www.csc.noaa.gov/digitalcoast/. The data can be used to re-populate the system. The data are provided in LAS format. LAS format is an industry standard for serving LiDAR data. The data are exclusively in geographic coordinates, however, the datums used vary. Most are NAD 83, however some are in ITRF. Vertical systems include both ellipsoid (ITRF and NAD 83) and NAVD 88. For NAVD 88 values, Geiod 03 is primarily used; however, data received in NAVD 88 prior to 2003 was processed using Geoid 99.

      Metadata Last Modified: 2011-11-19

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