Monitoring montane-subalpine forest ecotone in the Pyrenees through sequential forest inventories and Landsat imagery

Table 1 Forest inventory data employed in this study. NFI refers to the National Forest Inventories. NPFI refers to the Inventories carried out by the National Parks Autonomous Agency

Reference year	Year of accomplishment	Inventory	Total number of plots	Number of permanent plots
1991	1989	NFI2	78	31
1991	1993	NPFI1	95	95
2002	2001	NFI3	81	31
2002	2004	NPFI2	108	95
2015	2015	NFI4	47	31
2015	2015	NPFI3	108	95

ISSN: 1297-966X