tideland 
on is to 
ind tidal 
the one 
oetween 
eck may 
relative 
ing, has 
des the 
'S some 
major 
DTM for 
images 
second 
jen tide 
change 
led with 
rt of the 
ie DTM 
ference 
ent tide 
, when 
‘interest 
ong the 
ference 
xtracted 
orelines 
ugh an 
| 
| 
2.2 Detection of Shoreline Changes 
The procedure for detecting changes of shorelines 
includes: 
(1)preparing a historical target image and acquiring 
the associated tidal measurements, 
(2)performing geometrical registration for the target 
image with respect to the reference image set, 
  
Preparing a Set of Reference 
SPOT Images 
  
  
  
i 
Geometrical Registration 4 
  
| 
  
Extraction of Shorelines for 
each of the Reference Images 
  
  
  
(3)extracting shorelines from the target image, 
(4)tracing the corresponded shorelines from the 
reference DTM according to the tide elevation of 
the target image,[Lee & Chen,1990] 
(5)overlaying the shorelines acquired from (3) and (4) 
(6)the changes of shorelines between the historical 
target image and the reference image set are 
analyzed. 
  
Acquiring Timely Tidal 
Measurements for Each of 
the Reference Images 
  
  
  
  
  
la 
v 
Reference DTM Interpolation 
J 
> 
  
Preparing a Historical Target 
Image for Change Detection 
  
: 
  
Geometrical Registration of 
Target Image with Respect to 
the Reference Image set 
  
  
i 
  
Extraction of Shorelines from 
the Target Image 
  
  
  
  
Acquiring the Timely Tidal 
Measurements for the Target 
Image 
  
  
  
  
  
  
Y 
V 
  
  
Tracing the Corresponded Shorelines from the 
Reference DTM According to the Tide 
Elevation Associated with the Target Image 
  
  
  
  
Y 
  
Change Detection Analysis 
| 
Figure 1. The Flow Chart of the Proposed Scheme 
119 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996