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A Structure Scan mission is used for the visual inspection of buildings or creating 3-dimensional models of structures. It defines a layered grid flight pattern that captures images over vertical surfaces (e.g. walls) around a structure with an arbitrary polygonal (or circular) ground footprint.
The image above shows a structure scan. The green inner-polygon marks out the ground footprint of the structure, while the white line around it indicates the vehicle flight path. The green numbered circle on the flight path is the scan entry/exit point (where the scan starts).
The scan divides the structure evenly into layers; the vehicle flies all the way around the structure at a particular altitude and scan distance, then repeats the process at each layer until the whole surface has been scanned.
Users can set the scan bottom altitude to avoid obstacles at the bottom of the structure, and the entrance/exit altitude to avoid obstacles as the vehicle travels to/from the scan.
This topic shows how to create a structure scan mission and the various settings that can be configured in the Structure Scan Editor.
The easiest way to define a structure scan mission is to use the Plan view > Pattern > Structure Scan tool.
This creates a template for a simple end end-to-end structure scan mission for the current vehicle type. Often all the user has to do is define the scan area (any items that require configuration are shown with a red border in the mission item list).
If a more complex mission is needed, the basic mission can be extended by adding other items before the return item.
- 1.Open the Plan View and select the Pattern > Structure scan button. This creates a basic structure scan mission appropriate for the current vehicle type (clearing any existing mission).
- 2.Check that the Mission Start item settings are correct for the planned scan. In particular that the altitude (Waypoint altitude) is high enough to avoid obstacles when travelling to the structure.
- 3.From the Mission editor, select the Mission to edit the Structure scan settings.
- 4.Choose your survey area:
- Basic: Create a polygon footprint starting from a rectangle. The filled circles (vertices) and center can be moved where needed (using the map). New vertices can be created by selecting the markers between existing vertices, and then moved.Move and create vertices as needed so that the green area overlays the edges of the structure to be scanned.
- Circular: Create a circular footprint. The filled circles in the center and on the circumference can be moved on the map to change the circle's position and size. Center the scan on a circular structure and then adjust the radius until the green area overlays the edges of the structure.
- Trace: Trace around the shape of the target scan footprint. The filled circles can be moved on the map while tracing (you cannot move the center point or create new vertices). Select the Done Tracing button to stop tracing and display the Polygon Tools.
Note that the Structure Scan editor has a red border. This indicates that the item is undefined and must be explicitly set before saving the mission.
The mission Structure Scan Editor is used to configure Camera and Grid settings. The trash/bin icon can be used to delete the whole item
Set the camera first, before configuring the grid (camera capabilities affects the grid settings).
Users can select a predefined camera, custom camera, or "manual camera". The main difference is that using a predefined camera allows Auterion Mission Control to calculate an optimal layer height for a trigger distance, and visa versa while using a manual camera means that these parameters need to be manually calculated (and are therefore harder to change).
Structure Scan Camera Settings: Custom Camera
The Grid tab is used to set the properties of the scan.
The screenshot below shows the properties when using a predefined or custom camera.
Structure Scan Grid Settings: Predefined/Custom Camera
The scan settings allow users to choose a desired image overlap and set either desired scan distance or image resolution for the structure surface (automatically calculating the other value).
For a manual camera, the grid settings are instead specified as shown. Note that if any of these settings need to change, then they may all need to be manually recalculated.
The Scan section configures the order in which layers are captured, gimbal pitch, and other settings that ensure a clear flight path before, during, and after the scan.
The Statistics panel summarizes the calculated scan information: number of layers, layer height, top and bottom layer altitudes, photo count, photo interval, and resolution.