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Title
The 3rd ISPRS Workshop on Dynamic and Multi-Dimensional GIS & the 10th Annual Conference of CPGIS on Geoinformatics
Author
Chen, Jun

ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS", Bangkok, May 23-25, 2001
378
4(b) Sobel Operator
4(c) Robert Operator
5.Acknowledgement
This work is supported by the Natural Science Foundation of
China ( Grand number: 40023004 )
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