This tool enables users to draw a polygon on the map and configure camera parameters in order to automatically generate a mapping mission. Photogrammetry can be set from the mission tab by clicking on the Mapping icon and selecting photogrammetry from the list.
Photogrammetry Mission selection
First of all, the user must draw the polygon which indicates the zone the drone will cover with its flight (1).When the polygon is complete, the algorithm starts calculating the route and creating the mission (2).
Photogrammetry Mission Creation
The routes can be modified by changing the parameters in the menu which shows up when a waypoint of the mapping mission is clicked.
The following parameters can be set:
- Camera: camera type can be configured in this menu and switched from the list.
- Turn Radius: radius of the route turns. Depending on this value and the distance between passes, there are three cases for this part of the route (the radius has to be established according to the minimum recheable by the platform):
- If the radius is 0, there are not curves between passes, but straight lines. This option is used for multicopters, which are able tor perform that kind of path.
- If the radius is smaller than half the distance between passes (R<d/2), the curve created is a semicircle having as diameter exactly that distance.
- If the radius is bigger than half the distance between phases (R>d/2), the path between the straight lines is made up of two curves and a line.
- Overlap: It is the desired overlap of the photos in the route direction. Its effect will be evident in the photos period changes.
- Sidelap: The desired photos overlap in the different passes. Increasing this value will reduce the distance between the passes.
- Altitude: It is the waypoints altitude in AGL.
- GSD: The Ground Sampling Distance in photogrammetry is the distance between two consecutive pixel centres measured on the ground.
- In addition, the Main Direction of the mission can be edited (for example, to avoid excessive wind exposition). In the mission creation, at the centre of the created polygon, an orientable white arrow is present. When the arrow is turned, the mission will turn its main direction consequently.
The following image represents the mapping configurable variables in Veronte Pipe:
Overlap and Sidelap
The first time a mission is defined, the following menu will show up allowing the user to define the Camera specifications or selecting it from the database included in Veronte Pipe by clicking on the magnifying glass icon.
Camera and action creation menu
The five parameters that appear below the camera name are:
- Width Sensor in millimetres.
- Height Sensor in millimetres.
- Width resolution in pixels.
- Height resolution in pixels.
- Focal length.
In the lower part of the menu, it is possible to define the action required when the algorithm will active it (in this case, taking the photo), option Photogrammetry has to be selected. The action (usually Output) has to be defined according to the hardware configuration on board and when the definition is complete, an automation is automatically created as showed in the two pictures below. In the action, the Period is calculated according to the camera settings.
Mapping Automation Event
Mapping Automation Action
The configuration of the Photogrammetry mission is now complete. If the user wants to modify it, it can be done by changing the automation, the mission or the camera settings. The created camera can be found in the Devices panel as showed in the following figure.
It is also possible to create a camera previously and select it after during the mission creation. How to add a new camera and configure the option available is explained in section 6.6.2 .