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Proceedings Paper

An efficient method for transformation between QTM codes and geographic coordinates
Author(s): Xuesheng Zhao; Jun Chen; Zhilin Li
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Paper Abstract

QTM (Quaternary Triangular Mesh) on spherical surface is an efficient structure for managing the large volume of global spatial data. But the existing methods for the transformation between QTM Codes and Longitude/Latitude Coordinates are either not very efficient or lacking of orientation information in encoding scheme which is very useful in the adjacent query. To overcome these serious deficiencies, a new method is developed for transformation between long\latitude and QTM address codes. This method is simply called Row & Column Approach, or simply RCA. This method is a simple method without any map projection and it recursively approaches the address codes according to orientation information. Experimental evaluation shows that this method is much more efficient than the ETP (Equilateral Triangular Projection), i.e. only about 18% (conversion from longitude/latitude to address code) and 33% (conversion from address code to longitude/latitude) of time required by ETP.

Paper Details

Date Published: 28 October 2006
PDF: 11 pages
Proc. SPIE 6418, Geoinformatics 2006: GNSS and Integrated Geospatial Applications, 641816 (28 October 2006); doi: 10.1117/12.712907
Show Author Affiliations
Xuesheng Zhao, China Univ. of Mining and Technology (China)
National Geometrics Ctr. of China (China)
Jun Chen, National Geometrics Ctr. of China (China)
Zhilin Li, The Hong Kong Polytechnic Univ. (Hong Kong China)

Published in SPIE Proceedings Vol. 6418:
Geoinformatics 2006: GNSS and Integrated Geospatial Applications
Deren Li; Linyuan Xia, Editor(s)

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