National Geophysical Data Center (NGDC), NOAA Satellite and Information Service

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2010 US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX) Lidar: Northeast (Topo)

browse graphicThis kmz file shows the extent of coverage for the 2010 USACE Northeast lidar data set.
These files contain topographic lidar data in LAS 1.2 format classified as ground (2) and unclassified (1) in accordance with the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards. Rejected or invalid data is classified as noise (7). These data were collected by a HawkEye II (HEII) lidar sensor. The HEII integrates topographic and bathymetric lidar sensors, and a digital camera on a single remote sensing platform for use in coastal mapping and charting activities. Data coverage generally extends along the MA coastline, from the waterline onshore 500 meters. Native lidar data is not generally in a format accessible to most Geographical Information Systems (GIS). Specialized in-house and commercial software packages are used to process the native lidar data into 3D positions that can be imported into GIS software for visualization and further analysis. Horizontal positions, provided in decimal degrees of latitude and longitude, are referenced to the North American Datum of 1983 (NAD83). Vertical positions are acquired to the NAD83 ellipsoid. The National Geodetic Survey's (NGS) GEOID09 model was used to transform the vertical positions from ellipsoid to orthometric heights referenced to the North American Vertical Datum of 1988 (NAVD88). The 3D position data are sub-divided into a series of files each covering approximately 5 kilometers of shoreline.

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    Distribution Formats
    • LAZ
    Distributor Distributor information not available
    Point of Contact
    Documentation links not available.
      • publication: inapplicable
      Data Presentation Form: Digital image
      Dataset Progress Status Complete
      Data Update Frequency: As needed
      Purpose: These data were collected as a part of the NCMP to depict the elevations above the water in the coastal zone of Rhode Island, Massachusetts, New Hampshire, and Maine.
      Time Period: 2010-05-24  to  2010-07-10
      Spatial Reference System:
      Spatial Bounding Box Coordinates:
      N: 43.818460
      S: 41.288632
      E: -69.672420
      W: -71.966003
      Spatial Coverage Map:
      • Bathymetry/Topography
      • U.S. Army Corps of Engineers, Mobile District
      • JALBTCX
      • NCMP
      • USACE
      • JALBTCX
      • CHARTS
      • SHOALS
      • LAS
      • Lidar
      • Coastal Elevation
      • Terrain Elevation
      • Topobathy
      • US
      • Rhode Island
      • Massachusetts
      • New Hampshire
      • Maine
      Use Constraints No constraint information available
      Fees Fee information not available.
      Lineage Statement Lineage statement not available.
      • Geomatics Data Solutions
      Processing Steps
      • These data were collected using a HEII system. The system collects topographic lidar data at 64kHz, bathymetric lidar data at 4kHz and RGB imagery at 1Hz. Aircraft position, velocity and acceleration information are collected using an Applanix POS A/V 410. All raw data are processed using AHAB's Coastal Survey Studio (CSS) software. Aircraft position data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. Fledermaus and GreenC Solutions software is used to inspect and QA/QC data, and anomalous data are flagged as invalid. Data are exported to LAS format using GreenC Solutions and imported to Terrascan for classification. A customized classification macro is used to distinguish ground points (2) and unclassified points (1). The classification results are reviewed and any misclassified points are manually edited. In areas of dense vegetation the bare ground points might be incorrectly classified due to the inability of the laser to penetrate the canopy and reach the bare ground. Classified data are exported from Terrascan and Blue Marble Desktop converts all classified LAS data from UTM to NAD83 geographic coordinates and NAVD88 heights using the Geoid 09 model.
      • The NOAA Coastal Services Center (CSC) received data in LAS v1.2 format. The files contained LiDAR elevation measurements. The data were received in geographic coordinates (NAD83) and vertically referenced to NAVD88 using the Geoid09 model. The vertical units of data were meters. The data were classified according to ASPRS LAS classification scheme (1 = unclassified, 2 = ground). CSC performed the following processing for data storage and Digital Coast provisioning purposes: 1. The LAS files were converted from orthometric heights to ellipsoidal heights (GRS80) using Geoid 09. 2. The LAS data were sorted by latitude and the headers were updated. 3. The data were converted to LAZ format.
      • 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: 2013-01-22

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