2010 US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical
Center of eXpertise (JALBTCX) Lidar: Northeast (Topo)
This kmz file shows the extent of coverage for the 2010 USACE Northeast lidar data
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.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
Documentation links not available.
- publication: inapplicable
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||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.
||2010-05-24 to 2010-07-10
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- U.S. Army Corps of Engineers, Mobile District
- Coastal Elevation
- Terrain Elevation
- Rhode Island
- New Hampshire
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| 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 http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS or LAZ
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
LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively
in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically
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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