10th National Forest Inventory (NFI10)
Sampling design
The sampling design of NFI10 follows the design of NFI9, i.e., systematic cluster sampling is mainly applied. The parameters of cluster sampling – the distance between clusters, the shape of a cluster, the number of field plots in a cluster and the distance between plots within a cluster – varies in different parts of the country according to spatial variation of forests and density of road network.
Sampling designs areas and their parameters
| Area |
Average distance between clusters |
Shape of a cluster |
Distance between plots within a cluster |
No. of plots in a temporary (permanent) cluster |
| Åland (measured in 2007) |
3 x 3 km |
L-shaped |
250 m |
14 (10) |
| Southernmost Finland |
6 x 6 km |
L-shaped |
250 m |
12 (10) |
| Central Finland |
7 x 7 km |
Rectangular |
300 m |
14 (14) |
| Southern North Finland |
7 x 7 km |
L-shaped |
300 m |
13 (11) |
| Lapland and Kuusamo |
10 x 10 km |
L-shaped |
300 m |
13 (11) |
| Nothern Lapland |
Not measured |
- |
- |
- (9) |
Basic idea is to measure 20 % of the field plots each year. It will thus require about 5 years of field work to have the full sample measured. The permanent plots established in NFI9 (1996 - 2003) will be remeasured in NFI10. The ratio of temporary and permanent clusters is 3:1.
Map of sampling designs
You can have a look on the design of the area by clicking on the map.
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