A benchmark dataset for canopy crown detection and delineation in co-registered airborne RGB, LiDAR and hyperspectral imagery from the National Ecological Observation Network
Fig 8
Comparison of field-annotated crowns made by one author (SG) in blue (n = 16) and image-annotated crowns made by another author (BW) in red at Mountain Lake Biological Station, Virginia.
Intersection-over-union scores are shown in white. Only the image-annotated crowns associated with the field crowns are shown (out of the 206 image-annotated crowns in this image). From this and similar visualizations we determined that a threshold of 0.4 was a reasonable choice for eliminating crowns that are not sufficiently overlapping to be used for ecological analysis.