Engineering

Dewberry – Airfield Obstruction Survey – Calibration Test Reporting

Under task order G17PD01249: Alaska Critical Infrastructure UAV Airfield Obstruction Survey the Dewberry team was tasked to perform a test of the sensors that would be utilized in the survey of the Kiana and Nulato Airfields. As part of this testing our partners Compass Data and Phoenix LiDAR performed the acquisition and post processing of the LiDAR data using two (2)

sensors each flown at two different heights above ground. These parameters were designed in order to determine each of the following items:

 General Ability to meet project specifications – These tests were used to determine if each sensor could meet the general project requirements for data formatting and LAS point cloud data. Items like smooth surface repeatability, relative accuracy, intensity values, and other were tested for each sensor and flying height.

 LiDAR Density – Because we are utilizing a UAS based approach the intent was to determine what sensor and flying height would yield an appropriate density of points to determine the heights of obstructions.

 Geometric Calibration – Tested to determine if each sensor was providing accurate and repeatable measurements from the two different flying heights.

 Radiometric Testing – Tested to determine if each sensor was capable of identifying small or low-reflectance obstructions such as poles or antennas.

 Measurement Consistency – This was tested across each of the 4 flights to determine how consistently the maximum elevation could be determined on the test apparatus as well as on trees and other vertical features in the AOI.

The following report documents the calibration testing performed by the Dewberry team.

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Calibration of UAS based Phoenix Aerial AL3-32 & AL3-16 laser scanning systems with Terrasolid software

Objective

The objectives of the test campaign were:

– evaluating the accuracy of point clouds from Phoenix Aerial Systems in a realistic survey mission scenario

– testing the performance of Terrasolid software running on top of MicroStation CONNECT Edition, for calibration and further improvement of the data

The data sets were acquired with a Camflight FX8HL UAS platform and pre-processed to a trajectory file and to a point cloud file with Phoenix LiDAR Systems software. [register below to download full whitepaper]

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