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How Forests Are Measured and Monitored
An overview of how forests are counted, mapped and tracked over time, from tape measures and sample plots to satellites, lidar, camera traps and volunteers.
Managing and Measuring Forests
Measurement and Monitoring
How people count, measure and track forests.
Camera Traps and Sound Recorders for Forest Wildlife
How motion-triggered cameras and autonomous audio recorders document forest animals without disturbing them, and what their data can and cannot show.
Citizen Science in Forest Monitoring
How volunteers help track forests through bird counts, leaf-out dates and photo records, and what training, protocols and checks make their data reliable.
Defining a Forest: Why Definitions Differ
Why reported forest area depends on definitions: how thresholds for canopy cover, tree height and minimum area change the numbers for the same land.
Estimating Biomass and Carbon in Standing Trees
How diameter and height measurements are turned into estimates of tree wood, dry biomass and stored carbon using equations, wood density and carbon fractions.
Forest Health Indicators in the Field
The signs foresters check to judge forest condition, from crown thinning and leaf color to dieback, bark damage, dead wood and regeneration, and how to read them.
Forest Inventory Plots and Sampling
How small sample plots stand in for a whole forest: plot shapes, random and systematic layouts, expansion factors, basal area and why sampling error matters.
Lidar and Drones in Forestry
How laser scanning and drone surveys map forest canopy structure, including canopy height models, point clouds, and the limits of each technology.
Measuring Tree Height and Diameter
The basic field tools and methods for measuring individual trees: diameter tapes, calipers, clinometers and the trigonometry behind estimating a tree's height.
Satellite Imagery for Tracking Forest Cover
What satellites can and cannot show about forests: resolution, clouds, radar, spectral signals, change detection and why ground checks remain necessary.
Tracking Forest Loss and Gain Over Time
Why forest loss and gain figures disagree: gross versus net change, definitions, timing lags, plantations versus natural forest and how to read the numbers.
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