Geoscience Reference
In-Depth Information
Damaged areas obtained from remote sensing methods were compared with the
1/5,000 scale damage map to quantify the accuracy of the proposed method. Figure 6
shows the damage map and blocks where the detailed accuracy assessment was con-
ducted and error matrixes created.
Comparisons were conducted for each block in parcel base. Number of damaged or
non-damaged parcels within a block were calculated from difference image (Figure 5)
and damage map (Figure 6). Table 2 includes each block with box number (BOX NO),
box number are called based on their row and column location. For example, BOX NO
1-2 is corresponded to the box at row 1 and column 2 in Figure 5 and 6. Each block
has four values corresponding to status of parcels. The N/A is corresponded to not
available meaning that there is either no parcel or damage data in those regions. Based
on Table 2, the corresponding values of each cell for BOX 1-2 will be as following:
• Cell 1: parcels identified as damaged both in damage map and with the proposed
method, this value is 3 for block 1-2.
• Cell 2: parcels identified as non-damaged in damage map but damaged with the
proposed method, 4 for block 1-2.
• Cell 3: parcels identified as damaged in damage map but non-damaged with the
proposed method, 1 for block 1-2.
• Cell 4: parcels identified as non-damaged both in damage map and with the
proposed method, 6 for block 1-2.
Table 2.
Accuracy assessment of the proposed method using error matrixes.
BOX
NO
PARCELS
BOX
NO
PARCELS
BOX
NO
PARCELS
BOX
NO
PARCELS
BOX
NO
PARCELS
1-1
2
0
3-1
2
2
5-1
5
0
7-1
6
0
9-1
N/A
N/A
0
1
0
3
0
1
1
5
N/A
N/A
1-2
3
4
3-2
8
1
5-2
N/A
N/A
7-2
N/A
N/A
9-2
N/A
N/A
1
6
1
3
N/A
N/A
N/A
N/A
N/A
N/A
1-3
4
2
3-3
10
1
5-3
4
1
7-3
8
1
9-3
3
0
1
5
1
1
1
1
2
1
2
5
1-4
7
1
3-4
6
1
5-4
8
1
7-4
13
1
9-4
6
0
0
3
4
6
3
3
1
2
1
3
1-5
4
1
3-5
10
1
5-5
6
2
7-5
8
1
9-5
9
0
1
2
0
2
2
4
1
3
1
2
1-6
5
3
3-6
5
1
5-6
3
0
7-6
7
0
9-6
4
1
0
1
1
2
1
8
1
6
2
4
1-7
3
1
3-7
7
0
5-7
5
2
7-7
12
1
9-7
7
0
2
2
1
1
1
4
1
3
2
3
1-8
2
1
3-8
5
1
5-8
9
4
7-8
8
0
9-8
4
0
2
2
1
3
1
5
1
7
2
3
1-9
2
0
3-9
6
1
5-9
1
7-9
6
9-9
5
0
3
2
1
2
0
2
1
4
