Journal
PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING
Volume 81, Issue 8, Pages 625-635Publisher
AMER SOC PHOTOGRAMMETRY
DOI: 10.14358/PERS.81.8.625
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Funding
- Australian Postgraduate Award, Cooperative Research Centre for Spatial Information [2.07]
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Postgraduate Scholarship
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Pulse density, the number of laser pulses that intercept a surface per unit area, is a key consideration when acquiring an Airborne Laser Scanning (ALs) dataset. This study compares area-based vegetation structure metrics derived from multi-return ALS simulated at six pulse densities (0.05 to 4 pl m(-2)) across a range of forest types: from savannah woodlands to dense rainforests. Results suggest that accurate measurement of structure metrics (canopy height, canopy cover, and vertical canopy structure) can be achieved with a pulse density of 0.5 pl m(-2) across all forest types when compared to a dataset of 10 pl m(-2). For pulse densities <0.5 pl m(-2), two main sources of error lead to inaccuracies in estimation: the poor identification of the ground surface and sparse vegetation cover leading to under sampling of the canopy profile. This analysis provides useful information for land managers determining capture specifications for large-area ALS acquisitions.
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