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Surveying & Built Environment Vol. 22 Issue 1 (December 2012)

Surveying & Built Environment Vol. 22 Issue 1 (December 2012)

Surveying & Built Environment Vol. 22 Issue 1 (December 2012)

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SBE<br />

74<br />

direct Geo-referencing and<br />

orthophoto Correlation with<br />

demarcation district Sheets<br />

Conrad H. W. Tang* and H. D. Zhang**<br />

ABSTRACT<br />

This paper introduces two methods of deriving horizontal coordinates from a<br />

Demarcation District Sheet. The first method performs geo-referencing using longlasting<br />

prominent features on a Demarcation District Sheet directly. The second<br />

method performs geo-referencing against the 1963 orthophoto images, and this<br />

method is recommended and expected to have a wide application in the land<br />

boundary industry.<br />

KEY WoRdS<br />

Demarcation District Sheets, geo-referencing, orthophoto, land Boundary Record<br />

*Associate Professor, Department of Land <strong>Surveying</strong> and Geo-Informatics, The Hong Kong Polytechnic<br />

University. Email: lstang@polyu.edu.hk<br />

**Department of Land <strong>Surveying</strong> and Geo-Informatics, The Hong Kong Polytechnic University. Email:<br />

zhdong66@gmail.com

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