bul 2004 
  
0 pixels 
  
~ 
Y 
ima 
e 
a 
d Error 
nal To 
:valuate 
neasure 
(9) 
es. The 
(10) 
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
  
Where M and N denote the total number of the pixels in the 
horizontal and the vertical dimensions of the image. 5; ; 
represents the pixels in the original image and Y, j represents 
1997). 
the pixels of the stego-image (Chang Pearson 
Correlation Coefficient (Corr) is given by; 
SG [y -Y) 
Corr = (11) 
  
ERSC-UYSO- Wy 
eu 
MN 
where S = 
  
Figure 5: Stego-Image. 
Table 1: Objective measure values between Message image and 
Stego-Image. 
  
MSE Corr PSNR 
  
0.999 27.380 
  
  
  
  
118.866 
  
5. RESULTS 
Providing data security in spatial information systems has 
became an important subject due to the widespread use of the 
communication networks. The use of stenography in spatial 
information systems provides the following uses: 
- Protecting Copyright Infringement of IDs. 
-Storing additional data without changing file structures 
and sizes of the IDs. 
-Providing opportunity to develop defense information 
system applications with high security. 
-Storing additional thematic data to the ID without 
additional space. 
329 
-Providing high security in digital geoinformation 
exchange. ; 
- Providing the security of the multi-level ID by encrypting 
the data for unauthorized user accessibility. 
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