基于四叉树的海量空间数据无缝组织研究

摘要

Great capacity data has become one of the important characteristics to the study of Digital Earth(DE) with the development of the corresponding techniques. It has all kinds of data,great capacity ,slow access speed. Because of the expression and organization of the data, seam accrues. The paper introduced the great capacity characteristics in DE, the birth of seam. And in this way, discussed the structure of global quadtree, studied the methods of seamless joining, organized and handled the spatial data of line and polygon. Thus,the study makes the spatial database become seamless and unitary in logical.%随着数字地球相关技术的发展,海量数据逐渐成为在数字地球研究中的一个最根本的特征,主要体现在数据种类多、数据量大,访问速度不容易提高.由于原始数据的表达与组织不同,也导致了数据出现不同的缝隙.介绍了数字地球中海量数据的特点,空间数据缝隙的产生,在此基础上,探讨了基于全球四叉树的组织方式,阐述了无缝拼接的方法,并对线和多边形数据进行无缝组织和处理,以使地理数据库中的空间数据在逻辑上达到无缝状态,成为一个整体.