Canopy Extraction and Height Estimation of Trees in a Shelter Forest Based on Fusion of an Airborne Multispectral Image and Photogrammetric Point Cloud
Table 5
Evaluation of the accuracy of different extraction methods in the study areas.
Study area number
Crown extraction method
Shelter forest health situation
Crown matched
Crown nearly matched
Crown missed
Crown merged
Crown split
Recall
Precision
-score
1
a
Healthy
158
31
20
45
40
0.74
0.83
0.78
Dead
60
41
22
21
19
0.70
0.84
0.77
b
Healthy
194
39
8
29
24
0.86
0.91
0.88
Dead
83
51
13
9
7
0.86
0.95
0.90
2
a
Healthy
323
25
60
46
27
0.77
0.93
0.84
Dead
97
28
36
29
23
0.66
0.84
0.74
b
Healthy
389
31
27
19
15
0.90
0.97
0.93
Dead
144
32
17
11
9
0.86
0.95
0.90
3
a
Healthy
19
4
7
5
4
0.66
0.85
0.74
Dead
139
25
54
31
27
0.66
0.86
0.75
b
Healthy
27
6
1
2
3
0.92
0.92
0.92
Dead
189
38
15
18
16
0.87
0.93
0.90
a: the method of combination of LMF and MCWS; b: the method of FMSD-OBIA.
