Guide · July 2026
How many trees are on the property, how big are they, and is that number going up or down? A morning of flying replaces a week of counting — and this is one of the things aerial survey does exceptionally well.
How many trees are on this property, how big are they, and is that number going up or down?
It sounds like a question with an easy answer. Counting trees on foot across even a modest property takes days, so across a plantation, an orchard or a game farm it mostly never gets done. People estimate, or count a sample block and multiply, or rely on a figure someone wrote down years ago that nobody has checked since.
Meanwhile the answer matters commercially. Standing timber is an asset. Orchard tree counts drive yield forecasts and insurance. Browse availability determines what game a property can carry. Canopy cover affects valuation, compliance and carbon.
This is one of the things aerial survey does exceptionally well. A camera looking straight down at tree crowns is looking at exactly what it needs to see.
A count of individual trees, delivered as mapped points with coordinates. The measured height of each tree. Crown diameter and canopy area per tree. Total canopy cover in hectares and as a percentage of the property. Density in trees per hectare, across the property or per block. Size class distribution. Forest and woodland extent mapped as boundaries you can measure. And, where a previous survey exists, the change between them — growth, losses, clearing, new establishment.
The output is a map you can click a tree on and read its measurements.
The survey produces a canopy height model — the surface model minus the terrain model, leaving the height of everything growing. Tree crowns appear as distinct peaks in that height surface. Detection algorithms find those peaks, delineate the crown around each one, and produce a point per tree carrying its height and crown dimensions.
Orchards and plantations are close to ideal. Regular spacing, well-defined crowns and uniform structure make counts highly reliable, gaps and missing trees immediately visible, and block-by-block comparison across seasons straightforward. For an orchard operator this is the single most compelling use of aerial survey.
Savanna and bushveld are very strong conditions too — scattered trees with visible ground between them are exactly what individual tree detection is designed for, and most South African grazing and game land falls into this category.
Riverine strips, windbreaks and boundary plantings are easy to delineate and measure. Estates, golf courses and municipal grounds, where mature specimen trees are well separated and individually valuable, make an inventory well worth having.
Where canopy closes and crowns merge, the survey measures total extent, height and structure accurately while individual stem counts become well-founded estimates. For extent, biomass and change over time that is entirely sufficient — and where an exact stem count under closed canopy is essential, a ground sample is the right complement.
Value standing timber. A plantation is worth what its stocking, size class and volume say it is, and a survey provides all three across the whole compartment rather than from sample plots.
Plan thinning and harvesting. Density mapping shows which compartments are overstocked and which are underperforming, so operations are directed rather than uniform.
Run an orchard by the numbers. Exact counts per block, gaps identified for replanting, growth tracked season on season, and a defensible figure for insurance and finance.
Quantify browse for game. Canopy in the browsing height band, mapped and measured, informs stocking decisions for browsers and mixed feeders.
Prove change. Two surveys show new establishment, losses, storm damage, successful clearing or unwanted encroachment — with hectares and counts attached. That is evidence for a buyer, a bank, a lessee or an insurer.
And support due diligence. A buyer sees trees. A survey says how many, how big, how much of the property they cover, and whether that has been increasing.
South African legislation protects certain tree species nationally, and cutting, damaging or removing them generally requires authorisation. A survey does not identify species — but a mapped, dated record of every tree on a property, with positions and sizes, is a strong foundation for any assessment a specialist or authority subsequently makes, and a useful record to hold if a question arises. Specific requirements belong with the relevant authority or a qualified professional.
The country also has a substantial plantation sector, concentrated in Mpumalanga and KwaZulu-Natal, where compartment-level inventory drives commercial decisions directly. And canopy extent, height and density feed fuel load assessment and firebreak planning, which matters both operationally and in insurance conversations.
Fly in leaf-on conditions when the objective is canopy extent and crown measurement, since the crown is what is being measured. Fly at the same time of year when comparing surveys, so that seasonal change is not mistaken for real change. Calm air produces materially better crown delineation, and a higher sun angle reduces deep shadow between crowns.
None of these require anything unusual — they are simply what a well-planned survey looks like.
A tree point layer with one point per detected tree, carrying height, crown diameter and crown area, as a shapefile or GeoPackage. Tree count summaries — total, per hectare, and per block or compartment. Size class distribution. A canopy cover map with extent in hectares and percentage. The canopy height model, so the analysis can be revisited later. Change comparison where a previous survey exists. And the orthomosaic with the tree layer overlaid, for reporting and presentation.
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