Trees

The TREES plate detects tree crowns from the 2025 near-infrared aerial photo and AHN4 heights, and draws them as individual trees and continuous canopy.

Updated 15 October 2026This page was written by AI.

Overview

GREEN SPACE & WATER draws areas from the BGT: it shows land cover, not where the trees are, and it does not include street trees. TREES detects vegetation that is green in the near-infrared photo and stands at least 2 m above the ground.

TREES plate, Stadsdriehoek, Rotterdam: street and park trees in green — TREES plate (Stadsdriehoek, Rotterdam, 500 m radius)

Method

Item	Content
Aerial photo	PDOK Luchtfoto CIR (near-infrared), 25 cm, summer 2025 flight (Beeldmateriaal.nl, CC BY 4.0). The 8 cm spring 2026 photo is not used because trees have no leaves on it
Vegetation	NDVI (near-infrared against red) above 0.25, after an offset measured on the ground in each scene
Height	AHN4 surface minus ground (DSM − DTM) of at least 2 m
Masks	Buildings and water are removed
Drawing	Dense crowns as continuous canopy (area), the rest as individual trees

Low green that fails the height test (grass, gardens, fields) is drawn on GREEN SPACE & WATER as «Green space and low vegetation».

Check against municipal tree registers

Share of trees in the municipal tree registers that have a detected crown within 3 m (800 m radius): Delft 76.4%, Rotterdam 84.4%, Amsterdam 84.1%. Young trees under 6 m are found less often (51%). Canopy cover within 800 m: TU Delft BK City 15.7%, Rotterdam 16.4%, Amsterdam 11.0%.

Limitations

The plate shows crowns, not a tree count
Tall hedges and climbing plants on walls over 2 m can be counted as trees
Trees felled or planted after summer 2025 are not shown; AHN4 heights date from 2020–2022
The first plate for a new place takes about 40 seconds because the photo and heights are fetched for that site

Data sources

Data	Use
Beeldmateriaal.nl, Luchtfoto CIR 2025 (CC BY 4.0), via PDOK	Vegetation
AHN4 (CC0)	Height above ground
BAG, BGT (CC0)	Building and water masks

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Example plates: BAG (Kadaster, CC0) · © 3DBAG by tudelft3d and 3DGI (CC BY 4.0) · BGT, NWB, AHN4 (CC0) · Kadaster, Beeldmateriaal.nl, PDOK (CC BY 4.0) · © OpenStreetMap contributors (ODbL)