查询词典 spatial model

Then the spatial index is constructed which includes not only the external approximate expression but also interior approximate expression of spatial object and is extended from tranditional index only with external approximate expression. The index structures of MR-tree and MRD-tree based on multi-approximate expression are set up with the prototype index of R-tree, and the relevant algorithms about the index of insertion, deletion and search are provided. Then, the efficiencies of constructing index based on the multi-approximate expression and window range query are analysised and compared. In addition, the several algorithms and efficiency of soving the maximum enclosed circle and maximum enclosed rectangle are discussed and analyzed during constructing index based on multi-approximate expression.

首先，论文讨论了空间数据的特点、空间数据库的关键技术以及空间对象间的拓扑、距离以及方向关系，分析了空间对象的外部和内部近似表达，然后将传统索引中只利用空间对象的外部近似扩展为既有空间对象的外部近似又有空间对象的内部近似，即以空间对象的多重近似来构建索引，并以R-tree为索引原型构建基于多重近似的MR-tree和MRD-tree索引结构，然后给出了相关索引的插入、删除及查找算法，并通过实验比较分析了基于多重近似索引与基于外部近似索引的构建效率及窗口范围查询效率。

In order to study the regularity of soil salt accumulation in plough layer caused by groundwater in the Yellow River Delta, GIS and the fundamentals and methods of geostatistics were applied to regionalize the study area based on the spatial distribution pattern of groundwater table and the criteria of critical water table. And for each sub-region, quantitative analysis was performed between groundwater mineralization and soil salt accumulation in plough layer at the spatial scale.

为研究黄河三角洲地区地下水作用条件下耕层土壤的积盐规律，运用GIS和地统计学的原理与方法，结合地下水埋深的空间分布以及临界埋深的划分标准对研究区域进行分区，并从空间尺度对各分区地下水矿化度与耕层土壤积盐规律进行了定量分析。

Therefore, when the grid technique or the district was applied to regionalize spatial scale, individual soil profile are needed more to reduce uncertainties of the estimate of soil organic matter in the grid or the district with spatial scale up, but the uncertainties are smaller when using soil organic matter content in wellestimate gird or district to estimate the grid or district without available data by extrapolation.

因此，采用网格法或行政区划分空间区域，获得空间区域单元内土壤有机质含量或贮量的精确估算需要较多的剖面，但外推至数据不足的空间区域时，估算的不确定较小；采用土壤分类单元为空间区域单元，结果则相反。

The stable structure of mass base__ the particle of photon most afterwards reach the verge of relative macrocosm, combine the relative space-energy of self, again come to do the quantum of stable spatial measurement radiate reach the relative vacuum of spatial curvature is 1/3 index of change level, return in the dark energy of cosmic energy, by the stable speed of (9/4)×107 m /s come to do random shift, later on again at random relatively gather.

基础质量的稳定结构--光微粒子最终到达相对的宏观世界的边沿，携带自己的相对空间能，再次成为稳定宇称量子辐射到更平直的空间的曲率指数为1/3的相对真空中去，回到宇宙能量的暗能量行列，以(9/4)×107m/s 的稳定速度成随机地移动，以后再随机地相对聚结。

The rate of spatial variability of available N, available K, total N, total P, total K content and pH value in 2007 were all less than 20%, and their area rate of relative uniformity were 100%. The rate of spatial variability of available P and organic matter were large than 20%, and their area rate of relative uniformity were individually 91.34% and 95.70%, which large than 80%.

结果表明，2006年试验地中碱解氮、全氮、全磷、全钾、有机质含量和pH值的空间变异程度都小于20%，相对均匀面积比都为100%，速效磷和速效钾的空间变异程度大于20%，但相对均匀面积比分别为82.18%和94.99%，都大于80%。2007年试验地中碱解氮、速效钾、全氮、全磷、全钾含量和pH值的空间变异程度都小于20%，相对均匀面积比都为100%，速效磷和有机质的空间变异程度大于20%，但相对均匀面积比分别为91.34%和95.70%，都大于80%。

Through the analysis of many representative spatial domain watermarking algorithm, a novel image spatial domain blind watermarking algorithm was presented.

通过对多种空域水印算法优缺点的分析，提出了一种新的图像空域盲水印算法。

Changsha 410083, China）Abstract: Through the analysis of many representative spatial domain watermarking algorithm, a novel image spatial domain blind watermarking algorithm was presented.

摘 要：通过对多种空域水印算法优缺点的分析，提出了一种新的图像空域盲水印算法。

The existing resolvent of software for spatial data sharing and the characters of Spatial Data Grid were also discussed.

空间数据网格本身并没有产生新的协议，完全基于现有的W3C、OGSA以及0伴nGIS协议和规范。

To revivify the study on the spatial structure of urban commercial activity, which arose and thrived in 1980s, but is being stagnant in 1990s, the authors elaborate some concerns of the study on the spatial structure of urban commerce in direction and framework.

针对当前我国商业活动空间结构研究相对低靡的现状，本文对城市商业活动空间结构的概念和研究框架、评价和研究方法体系、亟待研究的重点以及中心性和城市区域关系等几个问题进行了概述，以期开创相关研究的新领域。

Study on the selection of spatial truss roof. After analyzing the types of space truss in common use in gymnasium, make sure the factors in selection of spatial truss and do further research of applicability and economy in this paper.

本文对体育馆建筑中常用的空间网架结构形式进行了分析，确定了网架结构在选型时所考虑的多种因素，并对不同类型的网架结构的适用范围和经济性进行了研究。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。