Important Airborne Lidar Metrics of Canopy Structure for Estimating Snow Interception
Abstract
:1. Introduction
2. Materials and Methods
2.1. Field Data
2.2. TLS Data Preprocessing and Canopy-Level Intercepted Snow Volume Estimation
2.3. Calculation of Standard Crown Metrics from Aerial Laser Scanning
2.4. Calculation of Novel Canopy Metrics from Aerial Laser Scanning
2.5. Analysis
3. Results
4. Discussion
4.1. Variable Selection
4.2. Study Assumptions and Potential Sources of Error
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Abbreviation | Definition |
---|---|
HMIN (m) | minimum crown height |
HMAX (m) | maximum crown height |
HMEAN (m) | mean crown height |
HSD (m) | crown height standard deviation |
HSKE | skewness of heights |
HKUR | kurtosis of heights |
HRANGE | HMAX-HMIN |
HQR | interquartile range (H75TH–H25TH) |
H25TH (m) | crown height 25th percentile |
H50TH (m) | crown height 50th percentile |
H75TH (m) | crown height 75th percentile |
H90TH (m) | crown height 90th percentile |
H95TH (m) | crown height 95th percentile |
H99TH (m) | crown height 99th percentile |
CL (m) | crown length (HMAX–CBH) |
CBH (m) | crown base height (1.5 standard deviations below the height returns mean) |
CRATIO | crown ratio (CL/HMAX) |
CPA (m2) | crown area (π*CRAD2) |
CV (m3) | crown volume as the convex hull 3D |
CSA (m2) | crown surface area as the convex hull 3D |
CDENS | percent crown density (returns ≥ CBH/total returns) |
ASV0.25 | whole tree volume (α = 0.25) |
ASV0.5 | whole tree volume (α = 0.50) |
ASV0.75 | whole tree volume (α = 0.75) |
UNOB | number of unobstructed returns * |
UNOB% | percent unobstructed returns * |
UNOBDK | number of unobstructed returns with decay function for weighted returns * |
UNOBDK% | percent unobstructed returns with decay function for weighted returns * |
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Russell, M.; Eitel, J.U.H.; Link, T.E.; Silva, C.A. Important Airborne Lidar Metrics of Canopy Structure for Estimating Snow Interception. Remote Sens. 2021, 13, 4188. https://doi.org/10.3390/rs13204188
Russell M, Eitel JUH, Link TE, Silva CA. Important Airborne Lidar Metrics of Canopy Structure for Estimating Snow Interception. Remote Sensing. 2021; 13(20):4188. https://doi.org/10.3390/rs13204188
Chicago/Turabian StyleRussell, Micah, Jan U. H. Eitel, Timothy E. Link, and Carlos A. Silva. 2021. "Important Airborne Lidar Metrics of Canopy Structure for Estimating Snow Interception" Remote Sensing 13, no. 20: 4188. https://doi.org/10.3390/rs13204188