Week 13 Field Outing
Introduction
In week 13, AT319 students continued flights at PWA. For
this field outing, the class was expected to work more efficiently than the
previous week. Nine ground control points were placed for this mission. This is
because each flight crew had to perform two missions during this lab. One
mission took place over the same area as the week 12 flights. For week 12, the
mission used a nadir sensor angle. The week 13 mission over the same area used a sensor angle of 60 degrees with crosshatch enabled. These settings
increased mission flight time because the Mavic took twice as many photos. The
other flight took place over the North field plot. GCPs were spread out through
both mission areas so each flight would have at least 5 GCPs in the data.
Additionally, students used ArcCollector to create individual GCPs where each of
the physical GCPs were placed. ArcCollector was used to demonstrate the
difference between survey grade GCP data and cellular GCP data.
All the field outings in AT319 were limited to the
same time constraint of about two hours. To make sure all flight crews were
able to perform two flights, crews had to work together and fly missions at the
same time. Flight crews communicated
with each other to make sure that all active flights were taking place at
different altitudes and that Mavics were not landing at the same time. Altitude
was staggered by 50 feet between missions.
The weather was better during this field outing than
the week 12 outing. Winds were only gusting from 9 to 20 knots.
GCP Setup - Aeropoint
AeroPoint GCPs are activated by pressing the button on top. AeroPoints are recording GPS data when the solid red light on top is on.
In order to ensure accurate GPS data, GCPs should be spread evenly throughout the mission area.
Aeropoints must be recording data for the entire duration of the mission. Set GCPs up before mission and collect them after the mission.
When distributing GCPs, document the order that they are setup in.
Aeropoint GCPs need to be turned off in reverse order of the way they were setup.
Study Area
The study area for this field outing was mostly the same
as the week 12 study area. Flights took place at PWA again. The only new feature
captured for this lab was the North field plot. Although much of the study area
remained the same, some of the features mentioned in the week 12 report changed
over the week. The construction area was more excavated than last time. It is
easier to see the area within the construction zone where a building will be
built. The field plots also changed through the week. Forestry students burned
the field plots. There is a map of the South field plot that shows the transformation
over the three weeks that AT319 flew at PWA provided in the week 14 report.
Metadata
General
Location: Purdue Wildlife Area
Date: 04/14/2021
Vehicle: Mavic 2 Pro
Sensor: ----
Battery: MV68 / MV33
Approval # (LAANC, COA, WAIVER): No LAANC approval.
Flight Information
Flight Number: 1 / 2
Takeoff: 2:26 p.m. / 2:55 p.m.
Landing: 2:36 p.m. / 3:16 p.m.
Altitude (ft): 350 ft / 400 ft
Sensor Angle: nadir / cross hatch on, 60 degrees
Overlap: 85%
Sidelap: 85%
Geolocating
System Used (GCP Type/PPK): Aeropoint GCPs
Coordinate System: NAD83 (2011) UTM Zone 16N
Weather
Metar: KLAF 141754Z 27009G20KT 220V330 10SM CLR/MO2
A3008
Crew
PIC: Jeff Hines
VO: Ethan Hood
Notes
Locator Map
Figure 1 - PWA
Locator Map (4/14)
Pix4D Point Cloud Screenshots
Figure 4 -
Salamander Tanks Screenshot 1
Shaded DSM
Shaded DSM with Color Ramp
Salamander Tank Insets
Figure 6 -
Orthomosaic Inset of Salamander Tanks
Soil Pile Insets
Figure 8 - Orthomosaic Inset of Soil Piles
North Field Plot Map
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