2.1 Aerial Photographs of Unmanned Aerial Vehicles
This segment introduces how to use consumer-grade uncrewed aerial vehicles to collect flight data. Reading instructions: The content below is for reference only.
Precautions for flight
Unmanned aerial vehicle operation has certain risks. Please operate safely when flying and stay away from the crowd.
Before the unmanned aerial vehicle flies, please check the local laws and regulations and relevant national regulations to carry out the flight mission under legal and safe conditions. Also, please check the relevant policies and safe flight guidelines for Xinjiang.
Before the flight, we should fully understand the site conditions (including building height, wires, buildings, crowds, etc.) of the area where the route passes.
Before flying, check the UAV equipment, including aircraft, remote control, and connecting equipment, to ensure sufficient power.
signals
Flight acquisition tutorial
The overlapping degree of flight and high-quality photos are the key factors that affect the quality of the final 3D model. Three-dimensional modeling data collection of consumer-grade uncrewed aerial vehicles for scenes is divided into surround and route shooting.
Surround the shooting objects layer by layer at different heights according to the flying mode of interest points. That is, manually flying around and collecting photos of surrounding buildings, suitable for three-dimensional modeling of a single building.
Surround shooting:
Surround the shooting objects layer by layer at different heights according to the flying mode of interest points. That is, manually flying around and collecting photos of surrounding buildings, suitable for three-dimensional modeling of a single building.
Precautions
Surround shooting is generally used for a single building or a single building.
Ensure the aircraft and remote controller signals are good during flight.
In manual photos, ensure the overlap between the left and right adjacent images and the upper and lower adjacent photos is at least 2/3.
Make sure to take a circle of downward-facing photos over the object to be photographed.
Procedure
Take the Dajiang Genie 4 Series uncrewed aerial vehicles as an example; the flight software is DJI GO, DJI GO 4.
Set the return altitude in the DJI GO (or DJI GO 4) as the safe height, which is generally not lower than the height of the buildings in the flight area. Check that the remote control operation mode is your skilled operation mode.
The takeoff aircraft hovers near the photographed object and adjusts its camera angle to 4. Adjust the aircraft's angle so that 1/3 - β of the shot picture is the ground (the ground photo is taken to ensure the integrity of the ground information), and the rest is the object to be shot.
Move the aircraft horizontally along the object to be shot, and operate the camera to take photos simultaneously. The camera picture controls the overlap degree of the two images, and generally, the overlap is not less than 2/3. After the first round of shooting, raise the aircraft to where the picture overlaps 2/3 with the picture in the first round of camera, and carry out the second height surround shooting.
Repeat the above steps to complete the shooting of other height photos until the top photo of the object to be photographed can be included in the camera picture.
After the camera angle is 45 Β° tilted, photos are taken. Adjust the camera angle to 90 Β° (face downward), make the height of the aircraft 10-50 meters higher than the object to be shot (if the object to be shot is higher, fly higher), and start to take a photo of the object to be shot down from the top. The overlap degree of the two adjacent images is not less than 2/3.
Route shooting:
The route is planned according to specific parameters, and the aircraft collects photos according to the autonomous flight of the route, mainly aiming at three-dimensional digitization of large areas, such as city modeling, site modeling, Park modeling, measurement, and other application fields.
Precautions
Ensure the aircraft and remote controller signals are good during flight.
In parameter setting, the height is generally set to 30-100 meters higher than the highest building height in the test area.
When there are many tall buildings in the test area, increase the course overlap rate and side overlap rate.
Procedure
This example uses a Dajiang Genie 4 Series uncrewed aerial vehicle, and the flight software completes the route shooting for the DJI GS PRO.
Open the DJI GS PRO software and click the lower-left corner to enter the flight task list.
Click + in the lower-left corner to create a task and select the mapping aerial photography area mode.
Click the map to select a point, and click the map area displayed on the screen. At this time, a quadrilateral will appear, in which the plane is about to fly. Drag the quadrilateral corner to adjust the flight area.
In the basic settings on the right side of the screen, set the camera model, camera orientation, camera mode, route generation mode, and flight height. The general parameter settings are shown in the following table.\
Click Advanced Settings to set the course overlap rate, side overlap rate, central route angle, margin, pan-tilt angle, and task completion action. The general parameter settings are shown in the following table:
Click the route Upload button to start uploading the route. As shown in the following figure:
NoteοΌ
The route Upload page must check that the completed action is automatically returned and the out-of-control action is continued. After the route upload is completed, generally, manually take off the uncrewed aerial vehicle to the safe range and then click the button to start execution on the remote control screen. If the takeoff site is mainly empty, the ground of the takeoff point of the crewless aerial vehicle is flat, and there are no obstacles on the ascending route; you can also directly click the Start button to enable the UAV to take off automatically.
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