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 2 - Construction Trailers Screenshot 1


Figure 3 - Vehicles Screenshot 1

Figure 4 - Salamander Tanks Screenshot 1


 

Shaded DSM



Shaded DSM with Color Ramp



Salamander Tank Insets


Figure 5 - DSM Inset of Salamander Tanks

Figure 6 - Orthomosaic Inset of Salamander Tanks


Soil Pile Insets


Figure 7 - DSM Inset of Soil Piles

Figure 8 - Orthomosaic Inset of Soil Piles


North Field Plot Map


Figure 9 - North Field Plot Map (4/14)










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