25kTrees (Individual Tree Crown Annotations)

Manual crown delineation of individual trees in two countries: Denmark and Finland.

---------- Denmark data---------- :

• More than 20k individual trees growing in different landscapes.

• Annotation masks are paired with aerial photographs with a spatial resolution of 20cm.

• Images contain RGB and near-infrared bands and were taken in summer 2018.

• Image credits: Danish Agency for Data Supply and Infrastructure (https://sdfi.dk/)

---------- Finland data---------:

• More than 4k individual tree crowns in random sampling regions

• Annotation masks are paired with aerial photographs containing near-infrared, green, and blue bands with a spatial resolution of 50cm

• Image credits: National Survey of Finland (https://www.maanmittauslaitos.fi/en/maps-and-spatial-data)

Tasks:

• Segmentation of individual tree crowns

• Transfer learning/domain adaptation between datasets with different visual semantics, band compositions, forest species, etc.

Paper: https://doi.org/10.1093/pnasnexus/pgad076