DFI Magazine May/June 2020 - 82
Wabasha Street orthomosaic map (above), with a selected elevation profile (below) derived from a drone flight path
conditions. An example would be the ability
to choose a crane location and verify that the
crane has the appropriate reach needed.
Optimal Drone Equipment
To successfully apply drone technology on
a construction site, it is important to utilize
commercial quality hardware to collect
data. Professional high-quality hardware
offers the following advantages:
* Improved reliability
* Improved data quality
* Access to advanced mission planning
features
* Integration with post processing software
Using a rock slide on an urban Minnesota
street and a commercial development site as
examples, the author at Collins Engineers
demonstrates the benefits of having an
accurate digital twin of a site for improving
project management and workflows. The
firm served as a consultant that used ground
control points (GCPs) to achieve a good
local, or relative, accuracy and absolute
accuracy that corresponds directly to GPS
coordinates. The automatic GCPs used
from Propeller Aeropoints have built-in
GPS units, a solar panel, battery and Wi-Fi.
Each unit collects GPS data while fieldwork
is being performed. The data is automatically uploaded to a server, where it is
adjusted via a correction network to attain
82 * DEEP FOUNDATIONS * MAY/JUNE 2020
Wabasha Street 3D point cloud of rock slide
up to 0.78 in (2 cm) accuracy. A report is
generated that gives each GCP's survey
grade location and the accuracy that can be
expected for each point.
Wabasha Street Rock Slide
On April 28, 2018, a rock slide from an
adjacent bluff occurred that closed
Wabasha Street in Saint Paul, Minnesota.
Despite happening in the middle of the
afternoon in a dense urban environment,
there were no injuries. The area was
deemed unsafe to the public, however, and
closed until the site could be assessed and a
plan to clean up and stabilize the bluff
could be prepared. The City of Saint Paul
hired Collins Engineers to map the site
with a UAS to gather information needed
for starting the remediation effort.
Fieldwork - The City of Saint Paul
contacted the firm on May 2 in the afternoon, and two professional engineers
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
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