2009 Aero-Metric Inc. Topographic LiDAR: North Slope Coastal Alaska
This kmz file shows the extent of coverage for the 2009 Alaskan Coastal North Slope
lidar data set.
This delivery contains point cloud data in LAS 1.2 format, with Absolute GPS Timestamps.
No classification has been completed on these data. The nominal point spacing is 1.2
meters. The following are the collection parameters and equipment used to create this
data set: Aircraft: Piper Navajo (N6GR) and Cessna 320 (N3443Q) Lidar System: Optech
ALTM Gemini (03SEN145 and 07SEN201) Approximate Collection Altitude (Above Mean Terrain):
1800 meters Ground Speed: 150 kts Pulse Rate Frequency: 70 kHz Mirror Scan Frequency:
32 Hz Scan Angle (+/-): 20 degrees Beam Divergence: Narrow (0.25 mrad) Accuracy statements
are based on areas of moderate terrain, with points temporarily classified as ground.
Diminished accuracies are to be expected in areas of extreme terrain and dense vegetation.
The accuracy of each point is expected to meet the vertical accuracy standard, derived
products may be less accurate in areas of extreme terrain and dense vegetation due
to a lesser number of points defining the ground in these areas.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
||National Oceanic and Atmospheric Administration (NOAA)
Documentation links not available.
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||The purpose of this data set is to provide lidar data in LAS 1.2 format
|| Unknown to Unknown
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- Remote Sensing
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| Processing Steps
- Create a smoothed-best estimated trajectory (SBET) of the sensor at a rate of 200
Hz, by integrating the airborne GPS and IMU data The airborne GPS data was processed
using TerraPos, and was referenced to WGS84 (G1150) with ellipsoidal heights.
- Integrate SBET and raw laser data to produce point cloud data in LAS 1.0 format for
each flight line, using DASHMap (Optech Inc).
- Data corrected for roll, pitch, heading and mirror scale errors using TerraMatch.
- Data adjusted to previous data that was matched to ground control in Kaktovik.
- All point cloud data output in LAS 1.2 format.
- Data converted to Absolute GPS Timestamps.
- The NOAA Coastal Services Center (CSC) received topographic files in LAS format. The
files contained lidar elevation and intensity measurements. The data were received
in projected coordinates of WGS84 UTM7N, meters and were vertically referenced to
the WGS84(G1150) ellipsoid. The vertical units of the data were meters. CSC performed
the following processing for data storage and Digital Coast provisioning purposes:
1. The topographic las files were converted from WGS84 ellipsoidal heights to NAD83
ellipsoidal heights. 2. The topographic las files were converted from Projected Coordinates
(WGS84 UTM7N, meters) to Geographic Coordinates (NAD83, decimal degrees). 3. Erroneous
elevations of greater than 25 meters were filtered and removed from the data. 4. 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: 2013-05-15
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