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Generating Pit-free Canopy Height Models from Airborne Lidar
Abstract
Canopy height models (CHMs) derived from lidar data have been applied to extract forest inventory parameters. However, variations in modeled height cause data pits, which form a challenging problem as they disrupt CHM smoothness, negatively affecting tree detection and subsequent biophysical measurements. These pits appear where laser beams penetrate deeply into a tree crown, hitting a lower branch or the ground before producing the first return. In this study, we develop a new algorithm that generates a pit-free CHM raster, by using subsets of the lidar points to close pits. The algorithm operates robustly on high-density lidar data as well as on a thinned lidar dataset. The evaluation involves detecting individual trees using the pit-free CHM and comparing the findings to those achieved by using a Gaussian smoothed CHM. The results show that our pit-free CHMs derived from high-and low-density lidar data significantly improve the accuracy of tree detection.
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“The pit-free algorithm was also adopted by the NEON team for generating their CHM product, and we found that different input parameters to the pit-free algorithm had negligible impact on the CHM output.”
From Very high resolution canopy height maps from RGB imagery using self-supervised vision transformer and convolutional decoder trained on aerial lidar (2024) · cites this paper as Khosravipour et al., 2014
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Metadata
- Authors
- Khosravipour, A., Skidmore, A. K., Isenburg, M., Wang, T., & Hussin, Y. A.
- Venue
- Photogrammetric Engineering & Remote Sensing
- Published
- 2014-09-01
- Volume
- 80
- Issue
- 9
- Pages
- 863-872
- ISSN
- 0099-1112
- Cited by
- 347
- References
- 0
- Language
- en
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