DFI Magazine May/June 2020 - 84

O'Gara's construction site generated from a point cloud (top image), and elevation profile (below) of blue line along
left edge of construction site

effort lasting less than 90 minutes amidst
ongoing construction activities. The actual
flight time took less than 20 minutes.
D a t a P ro c e s s i n g - T h e h i g h resolution images were post processed
using Pix4D software to create project
deliverables. The processing was performed
locally on a high-end computer and also on
the Pix4D cloud processing service. The
GCP data was incorporated into the model
to ensure both relative and absolute
accuracy. Deliverables included an
orthomosaic map of the area to determine
site construction limits, a point cloud and a
triangular mesh model of the site.
Results - The field investigation
proved to be an efficient, cost-effective and
safe way to collect and process a large
amount of data. The resulting maps and
models of the area were useful to engineers
and project managers involved in the
project in several ways. The resulting
model could be used as a check to identify
site safety issues and hazards. The
construction site model could also be used
to plan locations for equipment and
supplies. Because the model is dimensionally correct, it allowed measurements
to be made that included lengths, areas and
volumes. The model was annotated and
shared with project staff.
84 * DEEP FOUNDATIONS * MAY/JUNE 2020

Virtual inspector view of O'Gara's, with image from a point cloud (left), and a
soldier pile wall (green X) selected for closer inspection (upper right)

The O'Gara's construction site cloud
model is available at https://cloud.pix4d.
com/pro/project/415394?shareToken=d
85868ab-6cb2-4312-8ef6-1c3672311bc1

Conclusion
Commercial-quality drone hardware and
processing software are proving successful
at improving project workflows in many
ways. Drones enhance safety, reduce costs
and generate deliverables that help
engineers and project managers improve

project outcomes for owners. Big data that
has had an impact on many industries is
now also primed to have an exciting impact
on the civil engineering industry.

Barritt Lovelace, P.E., is a regional manager at
Collins Engineers with over 20 years of experience
designing hundreds of bridges and performing
bridge inspections. Lovelace is also a certified diver,
rope access technician, UAS pilot, nondestructive
testing technician and National Highway Institute
instructor.



DFI Magazine May/June 2020

Table of Contents for the Digital Edition of DFI Magazine May/June 2020

Contents
DFI Magazine May/June 2020 - Intro
DFI Magazine May/June 2020 - Cover1
DFI Magazine May/June 2020 - Cover2
DFI Magazine May/June 2020 - Contents
DFI Magazine May/June 2020 - 4
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