The wood charcoal database presented in this work contains 44 forest species (Table 1) which were cataloged by the Laboratory of Wood Anatomy at the Federal University of Parana in Curitiba, Brazil. The trees were cut in a natural forest, and disks were extracted from the diameter at breast height (DBH), with a thickness of about 8 cm. Twelve samples were obtained from each species, with dimensions of 2 X 2 X 5 cm. Each sample was wrapped in aluminum foil and carbonized in a muffle furnace (Q318S, Quimis), with a final temperature of 450 Celsius and a heating rate of 1.66 Celsius min−1. The carbonized material remained at the final temperature for two hours. The images were obtained directly from the carbonized material, without coating, with a tabletop microscope (TM-1000, Hitachi).
The images were stored in TIFF (Tagged Image File) format with no compression and resolution of 1280 × 1040 pixels. Figure 1 shows some samples of the database.
How to obtain access to the images
The Charcoal Database may be used for non-commercial research provided you acknowledge the source of the image by citing the following paper in publications about your research:
- Maruyama, T., Oliveira, L. S., Britto Jr, Nisgoski, S., Automatic Classification of Native Wood Charcoal, Ecological Informatics, 48:1-7, 2018.