2012 USGS Lidar: Brooks Camp (AK)

The U.S. Geological Survey (USGS) had a requirement for high resolution Lidar needed for mapping the Brooks Camp region of Katmai National Park in Alaska.

Aero-Metric, Inc. (AeroMetric) acquired highly accurate Lidar data for an area that comprises of approximately 17.5 square miles for the USGS. This acquisition was carried out to satisfy the need for high resolution elevation data in the region. A Leica ALS70 Lidar system was used in the collection of data for this project.

This project involves new Lidar data acquisition at an approximate pulse spacing of 0.6 meters. This data was to be calibrated such that all systematic errors were accounted for. The project required bare-earth classification and hydroenforcement of water bodies for the production of contours and digital elevation models.

Data was to conform to a vertical accuracy of 18.5 cm RMSE in open terrain. The accuracy as tested and published in this report has met vertical accuracy requirements as specified by the client.

The purpose of this data set is to provide a source for bare-earth topographic information. This data is not recommended for design grade mapping or engineering without a ground truth survey.

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This delivery consists of points classified to represent the bare-earth surface in LAS 1.2 format.

The following are the collection parameters and equipment used to create these data sets:

Aircraft: Piper Navajo (82TB)

Lidar System: Leica ALS70 (7161)

Approximate Collection Altitude (Above Mean Terrain): 1500 meters

Ground Speed: 150 kts

Lidar Pulse Rate Frequency: 70 kHz

Mirror Scan Frequency: 62 Hz

Scan Angle (+/-): 11 degrees

Side Lap: 54 percent

Accuracy statements are based on areas of moderate terrain, with points 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.

Classified data sets such as this one may have varying posting due to some pulses not reaching the ground.

Breaklines are available for this project though they have not been reviewed by NOAA, and are used with discretion.

A report for this project is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/4797/supplemental/ak2012_usgs_brooks_camp_m4797_surveyreport.pdf

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/4797/supplemental/ak2012_usgs_brooks_camp_m4797.kmz

LAS 1.2 format (classes 1,2,7,9,10)

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Any conclusions drawn from the analysis of this information are not the responsibility of Aerometric, INC., USGS, NOAA, the Office for Coastal Management or its partners.

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=4797

The data set is dynamically generated based on user-specified parameters.;

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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. These data depict the heights at the time of the survey and are only accurate for that time.

The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth files for the project area achieved an RMSE of 0.057 meters. One-hundred and Five (105) 'open terrain' survey control points were used in this evaluation, with an additional 20 'open terrain' points held in reserve and supplied to the client.

Data products collected were acquired at manufacturers system specifications, with a nominal point spacing of 0.68 meters.; Quantitative Value: 0.30 meters, Test that produced the value: Acquired at or below 1500 meters above mean terrain (AMT) and have a horizontal accuracy of 0.30 meters (per manufacturers system specifications)

The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth for all Areas achieved is 0.057 meters at a 95% confidence level in the "Open Terrain" land cover category. One-hundred and Five (105) survey control points were used in this evaluation.; Quantitative Value: 0.057 meters, Test that produced the value: FVA of the classified bare-earth points

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