Fig. 6
From: Take five: about the beat and the bar of annual and 5-year periodic national forest inventories
Spatial design of the Romanian annual forest inventory survey as initiated in 2008. The sampling design relies on a rhomboid grid pattern resulting from the shifting of every two lines of grid nodes from half the side size of a square grid (in black). A rhomboid associating sampling units of the four annual panels (numbered from 1 to 4) is highlighted (bold black). Clusters of 4 permanent plots are positioned at each grid node. The rhomboid grid is fractionated in 4 systematic panels constituted of parallelogram-shaped cells (panels of years 1/4 figured out in blue / light gray, respectively). Panels 1/2 and 3/4 share common sampling directions, which is not the case of any combination of two other panel. (Elaborated and drawn from Bouriaud et al. 2020)