排序方式： 共有33条查询结果，搜索用时 46 毫秒
31.
DU Shihong WANG Qiao QIN Qiming 《地球空间信息科学学报》2006,9(1):55-64
Introduction Inmanyapplications(CADandgeographical informationsystem,GIS),dataaremanagedby spatialdatabases,whichstorepoint,line,region objectsandspatialrelationsbetweenthem.Spa tialrelations(topologicalrelations,directionre lationsandapproximatedistancer… 相似文献
32.
The Quaternary： its character and definition 总被引：5，自引：0，他引：5
Martin J. Head Philip Gibbard Amos Salvador 《《幕》》2008,31(2):234-238
The Quaternary, is characterised by the development of widespread glaciations in mid-northern latitudes. As a chronostratigraphic term it has attracted vigorous debate. The Quaternao; as accepted by the International Union for Quaternary Research and proposed by the International Commission on Stratigraphy, begins at 2.6 Ma within a 2.8-2.4 Ma interval of profound change in Earth＇s climate system. 相似文献
33.
在文献[1]的基础上详细讨论了各台站直达波初动震相清晰度存在差异时如何利用井下和地面观测资料联合确定震源位置、发震时刻及区域平均波速的最优化方法。理论和实际检验表明,对于一个台网而言,考虑各台站震相清晰度间的差异,会使定位主要依赖于震相清晰的台站的资料,而震相不太清晰的台站的资料只对定位起参考作用。从而提高了整个台网定位的可信度。 相似文献