An efficient method for transformation between QTM codes and geographic coordinates

Xuesheng Zhao; Jun Chen; Zhilin Li

doi:10.1117/12.712907

28 October 2006 An efficient method for transformation between QTM codes and geographic coordinates

Xuesheng Zhao, Jun Chen, Zhilin Li

Proceedings Volume 6418, Geoinformatics 2006: GNSS and Integrated Geospatial Applications; 641816 (2006) https://doi.org/10.1117/12.712907
Event: Geoinformatics 2006: GNSS and Integrated Geospatial Applications, 2006, Wuhan, China

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.

Citation Download Citation

Xuesheng Zhao, Jun Chen, and Zhilin Li "An efficient method for transformation between QTM codes and geographic coordinates", Proc. SPIE 6418, Geoinformatics 2006: GNSS and Integrated Geospatial Applications, 641816 (28 October 2006); https://doi.org/10.1117/12.712907

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