Table 2 Values of bands 1~5,7 and VI before (BD) and after (AD)
and no damage
the damage for heavy,slight
Before Damage (1990.9.21) SEE
Band1(BD) |Band2(BD) |Band3(BD) |Band4(BD) |Band5(BD)|Band7(BD)|VI(BD) |
Heavy damage 54.5 20.6 15.3 51.6 29.7 8 153.3
Slight damage 53.5 20.4 15.2 54.1 31,5 6.7 155.2
No damage 83.1 20.6 15.4 54 28.6 7.8 154.6
After Damage (1992.5.21)
Band1 (AD)|Band2(AD)|Band3(AD)|Band4(AD)|Band5(AD)|Band7(AD)|VI(AD)
Heavy damage 93.1 39.5 43.5 67.8 94.9 43.4 121.3
Slight damage 84.8 34.9 34.1 61.1 59.2 23.2 127.9]
No damage 83.4 34.4 31.4 64.7 44.9 145 1533
160
140
120
“ 100 '—e—Heavy damage |
S | 80 e Slight damage |
hil —&—No damage |
[4/80 | Tack
C
© 40
20
0 l | |
OHR N AED 2-9
ED ZT TE ZN
— al €) sr LN N SL N q ier LN Ne =
Ob Du hau. LOL LO rule 9. D. SD
S 8 S S S Gg S S G S SG &
ea eo om co om co ea ea ea eo on on
Fig. 4 Characteristics of bands 1~5,7 and VI before (BD) andafter (AD) the damage for heavy slight
and no damage
3. METHOD OF THE STUDY
Fig. 3 shows procedures of the study. A geometric cor-
rected image of the test site was generated through the geo-
metric correction process using Ground Control Points from
each Landsat TM data acquired before and after the dam-
age. The accuracy of the geometric correction was less than
1 pixel and its pixel size was 25m square. Vegetation Index
(VI) was generated by the following equation.
A registered image of bands 1~5,7 and VI of two tempo-
ral data were generated. Typical points for heavy slight
and no damage were selected in the registered image refer-
ring the aerial photographs, and the change characteristics
of bands 1~5,7 and VI due to the damage were examined
using the typical points selected above.
It was found that band 5,7 and VI were effective to identify
the damage. A registered image of band 5,7and VI of two
temporal data was generated and the damaged areas were
VI=100 X (Band4 — Band3) / (Band4 + Band3) + 100
(1)
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996
512
