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Accuracy of the Copernicus High-Resolution Layer Forest Type (HRL FTY) assessed with domestic NFI sampling plots in Poland

Marcin Żaczek
Marcin Żaczek
, 
Mariusz Walęzak
Mariusz Walęzak
, 
Anna Olecka
Anna Olecka
, 
Sylwia Waśniewska
Sylwia Waśniewska
 oraz 
Anna Paczosa
Anna Paczosa
   | 31 gru 2023
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Data publikacji: 31 gru 2023
Zakres stron: 44 - 61
DOI: https://doi.org/10.2478/oszn-2023-0016
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© 2023 Marcin Żaczek et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1.

Species structure of dominant tree species (as of 1 January 2018)Source: based on Forestry in Poland 2019
Species structure of dominant tree species (as of 1 January 2018)Source: based on Forestry in Poland 2019

Figure 2.

Structural changes of tree species by aggregated groups of dominant tree species for selected years between 2010 and 2021 (as of 1 January)
Structural changes of tree species by aggregated groups of dominant tree species for selected years between 2010 and 2021 (as of 1 January)

Figure 3.

HRL Forest Type layer at the national scale.
HRL Forest Type layer at the national scale.

Figure 4.

Random overview of intersecting NFI plots and HRL FTY imaginary
Random overview of intersecting NFI plots and HRL FTY imaginary

Figure 5.

Overview of intersecting NFI plots and HRL FTY imaginary (example 1)
Overview of intersecting NFI plots and HRL FTY imaginary (example 1)

Figure 6.

Overview of intersecting NFI plots and HRL FTY imaginary (example 2)
Overview of intersecting NFI plots and HRL FTY imaginary (example 2)

Figure 7.

Overview of intersecting NFI plots and HRL FTY imaginary (example 3)
Overview of intersecting NFI plots and HRL FTY imaginary (example 3)

Figure 8.

Overview of intersecting NFI plots and HRL FTY imaginary (example 4)
Overview of intersecting NFI plots and HRL FTY imaginary (example 4)

Figure 9.

Overview of intersecting NFI plots and HRL FTY imaginary (example 5)
Overview of intersecting NFI plots and HRL FTY imaginary (example 5)

Figure 10.

Overview of intersecting NFI plots and HRL FTY imaginary (example 6)
Overview of intersecting NFI plots and HRL FTY imaginary (example 6)

Figure 11.

The Pearson’s correlation between number of NFI samples ((n) NFI plots) validated and OA of HRL FTY
The Pearson’s correlation between number of NFI samples ((n) NFI plots) validated and OA of HRL FTY

General characteristics of forest area by forms of forest ownership in 2019

Specification Grand total Of which wooded area in % of grand total area
Total Tree stands by age classes Restocking class and of a selection structure
I (1—20 years) II (21—40 years) III (41—60 years) IV (61—80 years) V (81years<)
[ha] [%]
Total (of which): 9242.4 96.9 11.9 14.8 23.8 20.0 23.1 3.3
1. Public forests (of which) 7460.1 97.3 12.2 14.0 22.2 19.4 25.9 3.6
i) owned by the State Treasury 7375.9 97.3 12.2 14.0 22.2 19.4 25.9 3.6
ii) managed by the State Forests 7110.0 97.4 12.5 14.2 22.2 19.4 25.5 3.6
iii) national parks 185.6 94.9 3.0 8.2 19.6 17.7 40.2 6.2
iv) stock of Treasury Agricultural Property 27.6 89.1 3.7 14.5 24.5 28.7 17.7 -
v) municipally owned 84.2 96.5 6.5 10.7 21.2 20.9 31.9 5.3
2. private forests 1782.3 95.1 10.7 18.2 31.3 22.3 10.9 1.7

UA of HRL FTY based on the Polish NFI sample plots (UA = user’s accuracy, 0 = non-forest, 1 = broadleaf dominated forest and 2 = coniferous dominated forest)

UA HRL FTY code Country level Natura 2000 Nature reserves National parks
(%)
non-tree covered areas (0) 31.85 37.38 28.57 30.43
broad-leaved (1) 70.14 71.32 77.01 67.63
coniferous (2) 73.73 73.28 65.35 71.15

HRL FTY EO based on the Polish NFI sample plots (EC = error of commission, 0 = non-forest, 1 = broadleaf dominated forest and 2 = coniferous dominated forest)

EC HRL FTY code Total Natura 2000 Nature reserves National parks
(%)
non-tree covered areas (0) 68.15 62.62 71.43 69.57
broad-leaved (1) 29.86 28.68 22.99 32.37
coniferous (2) 26.27 26.72 34.65 28.85

General confusion matrix of HRL FTY with the NFI plots (0 = non-tree covered areas, 1 = broadleaf dominated forest, 2 = coniferous dominated forest)

Confusion matrix between HRL FTY and NFI Overall forests area HRL FTY
non-tree covered areas (0) broad-leaved (1) coniferous (2) Total
NFI non-tree covered areas (0) 1144 2006 3287 6437
broad-leaved (1) 1178 11054 3707 15939
coniferous (2) 1270 2701 19626 23597
Total 3592 15761 26620 45973

Confusion matrix of HRL FTY with the NFI plots—national parks only (0 = non-tree covered areas, 1 = broadleaf dominated forest and 2 = coniferous dominated forest)

Confusion matrix between HRL FTY and NFI National parks HRL FTY
non-tree covered areas (0) broad-leaved (1) coniferous (2) Total
NFI non-tree covered areas (0) 21 43 60 124
broad-leaved (1) 26 234 75 335
coniferous (2) 22 69 333 424
Total 69 346 468 883

Producer’s accuracy (PA) of HRL FTY based on the Polish NFI sample plots (PA = producer’s accuracy, 0 = non-forest, 1 = broadleaf dominated forest and 2 = coniferous dominated forest)

PA HRL FTY code Country level Natura 2000 Nature reserves National parks
(%)
non-tree covered areas (0) 17.77 16.25 7.27 16.94
broad-leaved (1) 69.35 71.76 76.72 69.85
coniferous (2) 83.17 84.12 80.11 78.54

General characteristic of forest area by forms of forest ownership in 2022

Specification Grand total Of which wooded area in % of grand total area
Total Tree stands by age classes Restocking class and of a selection structure
I (1—20 years) II (21—40 years) III (41—60 years) IV (61—80 years) V (81years<)
[ha] [%]
Total (of which): 9260.3 97.2 11.5 14.2 21.5 21.6 24.4 4.0
1. Public forests (of which) 7474.6 97.5 12.0 13.6 19.9 20.5 26.9 4.6
i) owned by the State Treasury 7390.6 97.5 12.1 13.6 20.0 20.3 26.9 4.6
ii) managed by the State Forests 7121.4 97.6 12.4 13.8 20.1 20.5 26.3 4.5
iii) national parks 183.5 95.0 1.9 7.3 15.2 16.0 45.9 8.7
iv) stock of Treasury Agricultural Property 27.6 91.5 4.1 11.6 23.7 29.5 22.6 -
v) municipally owned 84.0 97.6 4.1 9.7 18.0 25.1 34.5 6.2
2. private forests 1785.7 95.8 9.4 16.5 28.1 26.4 13.6 1.8

Confusion matrix of HRL FTY with the NFI plots – Natura 2000 areas only (0 = non-tree covered areas, 1 = broadleaf dominated forest, 2 = coniferous dominated forest)

Confusion matrix between HRL FTY and NFI Natura 2000 HRL FTY
non-tree covered areas (0) broad-leaved (1) coniferous (2) Total
NFI non-tree covered areas (0) 117 245 358 720
broad-leaved (1) 88 1395 461 1944
coniferous (2) 108 316 2246 2670
Total 313 1956 3065 5334

Confusion matrix of HRL FTY with the NFI plots—nature reserves only (0 = non-tree covered areas, 1 = broadleaf dominated forest and 2 = coniferous dominated forest)

Confusion matrix between HRL FTY and NFI Nature reserves HRL FTY
non-tree covered areas (0) broad-leaved (1) coniferous (2) Total
NFI non-tree covered areas (0) 4 27 24 55
broad-leaved (1) 6 201 55 262
coniferous (2) 4 33 149 186
Total 14 261 228 503

OA of HRL FTY based on assessment of NFI plots and by age classes (n = number of sample plots, OA = overall accuracy, 0 = non-forest, 1 = broadleaf dominated forest and 2 = coniferous dominated forest)

OA Age class Country level Natura 2000 Nature reserves National parks
(n) number of plots
Regeneration phase 6263 809 62 137
1–10 2883 279 6 44
11–20 3970 308 19 68
21–30 3615 323 25 62
31–40 3359 364 25 55
41–50 3647 408 34 72
51–60 5160 576 47 99
61–70 4561 457 30 92
71–80 2954 337 34 54
81–90 3075 381 33 66
91–100 2148 302 41 30
101–110 1477 248 36 43
111–120 980 193 32 18
121–130 1315 349 79 43
>130 565 NA NA NA
Total 45973 5334 503 883
[%]
Regeneration phase 17.69 16.31 7.27 15.57
1–10 48.70 45.16 50.00 43.18
11–20 69.60 74.68 89.47 58.82
21–30 75.30 77.40 72.00 75.81
31–40 79.19 83.24 84.00 74.55
41–50 81.71 80.64 85.29 83.33
51–60 81.47 79.86 61.70 77.78
61–70 82.92 80.74 70.00 80.43
71–80 84.09 85.16 79.41 85.19
81–90 84.98 88.71 75.76 84.85
91–100 82.27 81.79 41.67 73.33
101–110 78.74 79.03 75.00 72.09
111–120 79.49 82.90 84.38 77.78
121–130 59.47 56.73 28.57 60.00
>130 59.47 56.73 28.57 60.00
Overall accuracy 69.22 70.45 70.38 66.59

HRL FTY EO based on the Polish NFI sample plots (EO = error of omission, 0 = non-forest, 1 = broadleaf dominated forest and 2 = coniferous dominated forest)

EO HRL FTY code Country level Natura 2000 Nature reserves National parks
(%)
non-tree covered areas (0) 82.23 83.75 92.73 83.06
broad-leaved (1) 30.65 28.24 23.28 30.15
coniferous (2) 16.83 15.88 19.89 21.46
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