auto-boundary

Automatically set a boundary using camera shot locations to limit the area of the reconstruction. This can help remove far away background artifacts (sky, background landscapes, etc.). See also –boundary. Default: False

Parameter Type:
Boolean
Parameter Domain:
True: --auto-boundary
False: null
Parameter Default:
False: null

Resource

Impact

CPU

●○○ | Low

GPU

○○○ | None

HDD

○○○ | None

RAM

●○○ | Low

Time

●○○ | Low


What Is Auto-Boundary?

--auto-boundary is a process that seeks to limit the boundaries of the reconstruction based upon a K-Means filtered Convex Hull buffered by 20x the mean GSD of the dataset.

When Is Auto-Boundary Helpful?

--auto-boundary is appropriate to use on any dataset where one might possibly consider limiting the area of reconstruction due to the presence of sky or far-away background that they would not normally consider part of the desired reconstruction.

--auto-boundary does not have a meaningful impact on nadir (or near-nadir) imagery without sky/background, making it superflous, but safe, to include.

In other words, if you would consider masking the image, --auto-boundary is likely a good choice.

Why would one use auto-boundary?

Auto-Boundary is most helpful in preventing the reconstruction area from growing needlessly large when things like sky, clouds, or far-away features like treelines get included in the reconstruction.

By preventing the boundaries of the reconstruction from growing needlessly large, Out-Of-Memory errors become far less likely, and one will likely see a decrease in processing time due to the smaller area being reconstructed.

Example Images

True: --auto-boundary

WebODM displaying the reconstruction extent of a terrestrial orbit survey of a Northern Catalpa tree.

The WebODM 3D View shows the full extent of the reconstruction, bounded by the --auto-boundary option.

False: null

WebODM displaying the reconstruction extent of a terrestrial orbit survey of a Northern Catalpa tree.

The WebODM 3D View shows the full extent of the recosntruction. Compared to the --auto-boundary reconstruction above, one can see that the full reconstruction area is much larger (and therefore more visually sparse).

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