Sample photographs and descriptions of the habitat classes defined a priori that were used for the supervised classifications. Habitat codes are defined in Table 1, and botanical codes are provided in Appendix 2.

	SprFor (H1): Habitat dominated by spruce trees (Pic mar). This was the most forested habitat and represents a forested peatland with scattered openings. Nem muc and Kal ang were dominant in the lower vegetation layers. ANG and MAG were the main Sphagna. Ple sch was abundant.
	Eric (H2): Habitat dominated by ericaceous shrubs, particularly Kal ang, Cam cal, and Led gro. Eri spi was present between hummocks.
	Herb (H3): Habitat dominated by herbs that were not too dense and included forbs (i.e., herbs not shaped like grasses) and sedges (Cyperaceae). Car oli, Smi tri, and Eri spi were the main herbs; RUB, CAP, and FAL, the main Sphagna.
	TSedge (H4): Habitat dominated by dense sedges. Car oli, Rhy alb, Car exi, and Car lim were the main sedge species. Cla flu was an abundant liverwort that sometimes formed dark patches.
	Spr (H5): Habitat dominated by spruce thickets (Pic mar). Kal ang, Led gro, and Car tri were dominant between spruce thickets. ANG, MAG, RUB, and CAP were the main Sphagna.
	EriSpri(H6): Habitat dominated by ericaceous shrubs with sparse spruce thickets (Pic mar). The ericaceous shrubs were represented mainly by Kal ang and Cha cal. The main Sphagna were CAP, FUS, and ANG.
	HerSpr (H7): Habitat dominated by herbs with sparse spruce thickets (Pic mar). Eri spi, Eri ang, Eri vir, Car tri, Rhy alb, and Smi tri were the main herbs, and RUB, CAP, and FUS were the main Sphagna.
	LarEri (H8): Habitat dominated by larch (Lar lar) and ericaceous shrubs. Nem muc, Rho can, and Cam cal were the main shrubs; ANG and FAL, the main Sphagna.
	EriLar (H9): Habitat dominated by ericaceous shrubs and sparse larch (Lar lar). Kal ang, Cha cal, and Led gro were the main ericaceous shrubs; ANG, CAP, FUS, and FAL, the main Sphagna.
	LarHer (H10): Habitat dominated by larch (Lar lar) and herbs. Smi tri, Car lin, Car oli, Men tri, Car exi, Car str, and Rhy alb were the main herbs; FAL, ANG, and MAG, the main Sphagna.
	HerLar (H11): Habitat dominated by herbs and sparse larch (Lar lar). Car oli, Car str, Smi tri, and Eri spi were the main herbs. RUB, FAL, ANG, MAG, and CAP were the main Sphagna.
	SprPool (H12): Habitat dominated by spruce thickets and pools. Kal ang, Gay bac, and Cam cal were the main ericaceous shrubs; Rhy alb, the main herb; and CAP, MAG, and CUS, the main Sphagna. Cla flu was an abundant liverwort.
	LawnPool (H13): Habitat characterized by lawns and pools. Utr cor, Mai can, Car pauc, and Sch pal were the main herbs. Aro mel and Vib cas were abundant. PAP, ANG, and CAP were the main Sphagna.