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Table 3 Candidate predictor variable. The ALS height distribution variables are supplemented with a prefix f or l, which means that the variable was computed from first or last echoes, respectively

From: Predicting stand age in managed forests using National Forest Inventory field data and airborne laser scanning

Type Variable Abbreviation
ALS-A height percentiles p05, p10, …, p90, p95
canopy density percentiles b05, b10, …, b90, b95
canopy cover cov
mean height
maximum height standard deviation of heights
avg
max
stdev
scanner type Leica60, Leica80, Optech, Riegl
ALS-B inventory area Ähtäri, Heinävesi, Juva, Kemiö, Kuhmo, Kyrönmaa, Orimattila, Sodankylä, Suomussalmi
Geographic major region other, Lapland
latitude  
longitude  
elevation  
degree days dd
slope  
NFI-A site fertility class site1, … site5
land use class productive, low
soil type mineral, peat
NFI-B forest structure natural, almost natural, managed
mean diameter meanD