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| —e— Heavy damage 
| —q$— Slight damage | 
| —&— Cedar | 
| —-X— -Pine 
| —»— Deciduous trees 
  
  
Band5(BD) 
Band7(BD) 
Band5(AD) 
Band7 (AD) 
VI(AD) 
  
Fig. The characteristics of bands 5,7 and VI before (BD and after (AD) the damage for the categories 
of the heavy and slight damage,cedar,pine and deciduous trees. 
extracted by a maximum likelihood classification method 
using the registered image of band 5,7 and VI. The dam- 
aged areas extracted by Landsat TM data were evaluated 
using the aerial photographs and data on the damage sur- 
veyed by the Local Development Office. 
4.EXAMINATION OF CHANGE CHARACTERISTICS 
OF BANDS 175,7 AND VI DUE TO THE DAMAGE 
Typical points representing each group of heavy,slight and 
no damage were selected reffering the aerial photographs 
in the registered image of bands 15,7 and VI of two tem- 
poral data. The extent of the damage was classified into 
two stages of heavy and slight and the state of each damage 
is as follows : 
Heavy damage : Trees are entirely fallen in the selected 
points. 
Slight damage : Trees are partly fallen in the selected points. 
Âs most of the damage occurred in coniferous trees where 
cedar or cypress were mainly planted, no damaged areas in 
plantations of cedar were selected as the typical points of 
ho damage. About 10 points were selected for each group 
of heavy,slight and no damage. Table 2 shows the values 
of bands 1~5,7 and VI before (BD) and after (AD) the 
damage for heavy, slight and no damage, which were ob- 
tained by the average data of the selected points for each 
8roup and Fig. 4 shows their graph. It can be seen from 
513 
Fig. 4 that there is no change among each damage group 
for bands 1~5,7 and VI before the damage but bands 1~ 
5,7 increase and VI decreases after the damage. It seems 
that the change among each damage group are larger in 
bands 5, 7 and VI than bands 1~4. It is conspicuous that 
band 5 and 7 of middle infrared increase much due to the 
damage. It is considered that the fallen trees show a high 
reflectance for middle infrared because they are dried at 
the time of satellite observation after the damage. A regis- 
tered image of band 5,7 and VI of two temporal data was 
generated and used for the extraction of the damaged areas. 
5. EXTRACTION OF DAMAGED AREAS 
The damaged areas were extracted by a supervised maxi- 
mum likelihood classification using the registered image 
of bands 5,7 and VI of two temporal data. Several catego- 
ries such as cedar or pine etc. were selected in addition to 
the heavy and slight damage in the classification. Training 
areas for each category were selected referring the aerial 
photographs,geographical and vegetaion maps. Fig. 5 shows 
the characteristics of the bands 5,7 and VI before (BD) and 
after (AD) the damage for the categories of the heavy and 
slight damage, cedar,pine and deciduous trees. The pine 
and deciduous trees are larger than the heavy and slight 
damage before the damage,but are a little near to them after 
the damage. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996