there is no interference from operator during correlation procedure 
even when some difficulties with correlation have been encountered. 
In this case system can automaticlly transit for further correlation. 
It means that this system can be treated as batch process to a com- 
puter ° 
Furtner investigation are still needed, such as how to consider the 
morpnological feature lines followed by operator prior to correla- 
tion onananalytical plotter or a stereo-comparator, to increase 
tne reiiablity and accuracy of correlation. 
REFERENCES 
/1/ M.M. allam: The Status of The ISPRS Image Correla- 
g 
tion Test. 
Invited Paper, Commission [/2, XV ISPRS 
Congress, 1984, 
/2/ Lin Zongjian: Vector Analysis for Correlation Algo- 
rithms. 
Acta Geodetica et Cartographica Sinca, 
Vol. 14 No9.2,. 1985. 
/3/ Zhang Jianjing: The Estimation and the Analysis of the 
Image power Spectrum of Aerial Photo- 
graphs. 
Journal of The Wuhan Technical Univer- 
sity of Surveying and Mapping, No.2, 
1982. 
/4/ 4nang Zuxun: On Orietation of Digital Image and Re- 
sampling along Epipolar lines. 
Journal of WTUSM, No.1,:1083., 
/5/ 4hang Zuxun: On The Gray Value Interpolation of Image 
Elements. 
Acta Geodetica et Cartographica Sinca 
Vol. 124, h0.5,. 1995 
/6/ Zhang Zuxun: On The Digital Correlation and It's 
Accuracy Evaluation. 
Acta Geodetica et Cartographica Sinca 
/1/ Zhang Zuxun: On The Generation of Parallax grid by 
Using off-line Digital Correlation. 
Presented Paper, Commision.[[,XV ISPRS 
Congress, 1984. 
- 681 =