point cloud data - all returns - classified: Classified (ASPRS standard) LiDAR values for all returns (distributed in LAZ format) las-index: polygons that serve as an index to the spatial location and extent of each point cloud (LAS) bin border: polygon that encompasses the maximum geographic extent of the data observations dsm: digital surface model (first return), 3 meter resolution, single band raster dsm_hs: hillshade of digital surface model (first return), 3 meter resolution, three band raster dtm: digital terrain model (bare earth), 3 meter resolution, single band raster dtm_hs: hillshade of digital terrain model (first return), 3 meter resolution, three band raster
Southerland, L.E., and Kinsman, N.E.M., 2014, LiDAR data for Unalakleet, Alaska, collected in October 27, 2005: Raw Data File RDF 2014-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.01
Ordinates (y-coordinates) are specified to the nearest 0.01
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257222101.
Alpha numeric values that uniquely identify each LAS bin
This publication is funded with qualified outer continental shelf oil and gas revenues by the Coastal Impact Assistance Program, U.S. Fish and Wildlife Service, U.S. Department of the Interior. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Government.
This report is a summary of a LiDAR data collection over the community of Unalakleet, in the Norton Sound region of Alaska. The original data were collected on October 27, 2005 by AeroMetric, Inc., under contract by Rodney P. Kinney and Associates, Inc. The complete, classified LiDAR dataset was purchased by the State of Alaska Division of Geological & Geophysical Surveys in 2013 in support of coastal vulnerability mapping efforts. For the purposes of open access to LiDAR datasets in coastal regions of Alaska, this collection is being released as a Raw Data File with an open end-user license.
Accuracy statements are based on areas of moderate terrain. 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, however, derived products may be less accurate in extreme terrain and dense vegetation due to a lesser number of points defining the bare-earth in these areas. Questions regarding data accuracy can be best answered by AeroMetric/Quantum Spatial (Anchorage, Alaska) staff. The dataset was provided to us in LAS 1.1 format (not in LAS 1.3 format as noted in the delivery report.)
Data products collected were acquired at or below 600 meters above mean terrain (AMT) and have a horizontal accuracy of 0.4 meters (per manufacturer's system specifications) with a nominal point spacing of .74 meters. No direct testing of the horizontal accuracy was feasible given this dataset.
The bare-earth classified LiDAR data were compared to Rodney P. Kinney and Associates check points throughout the project area. A statistical summary of the elevation differences was completed.
DGGS staff performed visual qualitative assessment to ensure data completeness. There are no void areas or missing data. Users should note that this dataset was acquired in 2005 and subsequently migrated to more modern specifications in 2013. Questions regarding data quality and completeness can be best answered by AeroMetric/Quantum Spatial (Anchorage, Alaska) staff. In addition to the classified point cloud data and delivery report provided by this release, AeroMetric also provided to DGGS: trajectory values, unclassified point cloud data, and a statistical summary of the elevation differences between LiDAR values and the ground survey points that were collected by Rodney P. Kinney and Associates)
Quality control and quality assurance ground survey points were collected by Rodney P. Kinney and Associates and supplied to AeroMetric.
Are there legal restrictions on access or use of the data?
- This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
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The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
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|Data format:||Lidar point cloud data and derivative files|