An adjustment model for terrestrial laser scans

Terrestrial laser scanning (TLS) technologies are now being used to provide detailed forest inventory information at the tree or plot scale.

A major problem to overcome when using TLS is occlusion by surrounding trees, lower branches and under-storey. An occlusion adjustment model was evaluated in 24 stands in Oregon, USA and Australia.

The model can be used to predict stand-level tree count densities with minimal errors, especially if an appropriate plot radius is selected. The optimal plot radius may be dependent on the stand-type in which the TLS is being undertaken. Other approaches are likely to be more appropriate if accurate stem counts are required at the individual plot level.

Source: R&D Works Newsletter

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