International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 Internat 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
method. 
To com 
JERS-1/SAR Observed on Sept.26,1995 Path/Row 126-276 : 
flood-in 
Additior 
rice gro 
Filtering to remove speckle noise 7 
= area. Thy 
x. 
b ; : 3.4 Gro: 
Judging from the histogram of the data 
TI 
Y Ÿ 
the satel 
Under threshold=1800 Over threshold=2300 
Ÿ Y 
4. 
Determination of 3 by 3 square window dilation 4.1 NAS 
clearly water surface operation for filling the NA 
| interval areas of levees in . 
several u 
improved paddy fields as , 
p paddy s as non of poter 
damaged fields 
program 
Y s 
“Infomaı 
Final calculated image combined both images M 
= recent w 
Fig.4 Flow chart of the computational method of flood detection field. 
4.2 Web 
Fig.5 indicates the location of this analysis, around Ayuthaya was started in the end of August, 1995 and reached the peak T 
to Lop Buri, Ang Thong in the Central Plain of Thailand along depth of water at the end of September in this region. The windows 
the Chao Phraya river. This area is over the JERS-1/SAR scene flood-inundated period was very long. It provid 
"Macrom 
engine (a 
     
  
the Web 
server. (C 
t 192 1600 19/meps 
IHD MRC # 
PoE 3 
o. xe 
D: 
E 
Io SANE 
a) "ganan 
Fig.5 micro-geomorphological Fig.6 Fig. 7 Fig.8 Fig.9 
survey map (around Ayuthaya to Lop Buri) 
Fig.6 is a part of the reported inundation map (gray color) intensity change to the correspondent pixels in plural images. 
around Lop Buri. Fig.7 is the result of morphological image But it is rather difficult to distinguish flood-inundated areas 
processing. (white color)  Fig.8 shows a part of the from paddy fields (Fig.9), because ordinary paddy fields have e 
micro-geo-morphological survey map. Fig.9 indicates the water surface. The image by mathematical morphology (Fig.7) Fig. 15. a 
flood-damaged areas in paddy fields using the conventional is similar to the flood report (Fig.6). The analytical method 
analytical method. requires only snapshot SAR image, quick calculation and little 
The conventional method employs the SAR signal hardware resources. This is advantage over the conventional 
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