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《Geomatics World》 2017-04
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Expression and Accuracy Analysis of Globe Land30 Data Based on DQG

ZHU Sikun;ZHAO Xuesheng;College of Geoscience and Surveying Engineering, China University of Mining & Technology(Beijing);  
The world's first global land cover datasets at 30-meters resolution(Globe Land30)had been produced by National Geomatics Center of China(NGCC)in 2014.This product is organized in tiles with the Universal Transverse Mercator Projection(UTM).In order to resolve the problem of data discontinuity and geometry deformation on the globe scale by map projection,a continuous and uniform expression model based on the spherical Degenerate Quadtree Grid(DQG)for the Globe Land30 data is presented in this paper.By choosing different representative sphere zones and corresponding error evaluation index,a series of contrast experiments are completed and analyzed for the error distribution and quantification of the Globe Land30 data in DQG model.The results show that the DQG model not only keep the expression of the Globe Land30 data continuous and uniform,but also keep the same accuracy as well,and will provide a foundation for the continuous visualization and depth analysis of the Globe Land30 appplications.
【Key Words】: GlobeLand30 discrete global grid systems DQG projection distortion
【Fund】: 国家自然科学基金项目(41671394)资助
【CateGory Index】: P208
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