Geoscience Reference
In-Depth Information
Table 2.
(Continued)
BOX
NO
PARCELS
BOX
NO
PARCELS
BOX
NO
PARCELS
BOX
NO
PARCELS
BOX
NO
PARCELS
1-10
1
2
3-10
4
0
5-10
3
7-10
4
9-10
4
0
1
2
1
1
0
1
1
6
1-11
4
0
3-11
5
1
5-11
N/A
N/A
7-11
3
1
9-11
3
1
2
3
1
2
N/A
N/A
0
3
1
6
2-1
6
1
4-1
N/A
N/A
6-1
3
1
8-1
N/A
N/A
1
0
N/A
N/A
0
3
N/A
N/A
2-2
6
0
4-2
3
2
6-2
N/A
N/A
8-2
N/A
N/A
2
3
1
4
N/A
N/A
N/A
N/A
2-3
6
0
4-3
4
2
6-3
10
8-3
5
1
3
1
1
3
1
2-4
8
0
4-4
9
0
6-4
10
8-4
8
2
2
1
3
3
1
2-5
6
0
4-5
7
2
6-5
6
8-5
5
1
2
0
2
0
7
2-6
6
1
4-6
4
1
6-6
8
8-6
6
2
3
1
8
0
2
2-7
4
0
4-7
2
1
6-7
10
8-7
5
2
2
2
4
3
2
2-8
3
0
4-8
1
1
6-8
8
8-8
7
0
4
3
5
0
1
2-9
2
0
4-9
5
0
6-9
5
8-9
4
0
0
3
7
2
3
2-10
2
1
4-10
4
0
6-10
2
1
8-10
6
0
1
4
9
0
3
2
2-11
4
0
4-11
N/A
N/A
6-11
N/A
N/A
8-11
N/A
N/A
2
1
N/A
N/A
N/A
N/A
N/A
N/A
In most cases parcels identifi ed as damaged in the damage map but non-damaged
with the proposed method (cell 3) occurred because there were only one or two col-
lapsed buildings within a parcel which could not be identifi ed using SPOT images.
Block 1-2, 1-3, 1-10, 4-5 are examples of this situation. On the other hand, most of
the parcels having more than three collapsed buildings were easily identifi ed using the
proposed method. Higher resolution satellite images should be used to identify col-
lapsed buildings individually.
The overall accuracy of each block ranges from 50 to 100% (Figure 7). Most of the
blocks have accuracy value higher than 75%. The minimum accuracy was obtained for
Block 1-10, because there are three damaged parcels and two of these parcels include
only one collapsed building which is hard to identify with current spatial resolution.
Most of the parcels which have plenty of collapsed buildings were easily identifi ed
with 75% or higher accuracy.
