索引

According to the data's division and organization, multidimensional data indexes can be divided to two classes: indexes based on space, indexes base on data .

根据数据的划分组织方式，多维索引结构分为两大类：基于空间划分的索引结构和基于数据划分的索引结构。

To fulfill a TV guidance system task of fast recognizing and tracking missile target from sequential images including multiple interferences,a fast segmentation and target characteristic extraction algorithm of sequential images based on binary image index map was proposed.After the sequential images were processed to binary images,a Field Programmable Gate Array was used to scan the binary image once and an index map was built,and then Digital Signal Processing was used to scan the index map once.

针对电视制导系统需从包含多个干扰目标的序列图像中快速识别和跟踪导弹目标的要求，提出了一种基于二值图像索引图的序列图像快速分割及目标特征提取算法，在序列图像二值化后，只需由FPGA对其遍历一次就可得到一张含有目标信息的索引图表，再由DSP对该索引图表边遍历边计算就可得到图像所含目标的数量、面积、质心坐标、二阶矩不变量等特征。

Google Web search team infrastructure software engineers Ye Xie Er Bote and尼森哈扎伊 said:"Of course, we do not index these pages 1 trillion in each of a page Because a lot of similar content pages, or automatically generated content, users do not have much value, but we have such a huge volume of the index are proud that our goal is to index the world's data."

谷歌Web搜索基础设施小组软件工程师耶西。阿尔波特和尼森。哈扎伊称："当然，我们不会索引这1万亿幅页面中的每一幅页面，因为很多页面内容相近，或是自动生成内容，对于用户没有太大价值。但是，我们为拥有如此巨大的索引量而感到自豪，我们的目标就是要索引全世界的数据。"

Besides, we propose a Linkvalue algorithm which link index combined with value index.

此外，我们提出了一个实现链接索引与值索引相结合的索引优化算法Linkvalue。

The journal is abstracted and indexed in Current Contents/Clinical Medicine, Excerpta Medica/EMBASE, Index Medicus/MEDLINE, and Science Citation Index Expanded.

该杂志是抽象和索引当前目录/临床医学，医学文摘/文摘，医学索引/检索和科学引文索引扩大。

First, we discuss the classification of existing spatial indexing methods and point out the problems of them. Second, the approximate representation of spatial objects is given. Third, the structure and the algorithm of CP tree, which based...

本文首先介绍了目前常用的几类空间索引技术及其特点，接着讨论了面向地理信息的空间索引技术面临的基本问题，提出了基于凸多边形的空间索引结构—— CP-树，并侧重分析了其空间运算算法及时空效率，最后指出了空间索引技术所存在的问题及下一步的研究方向。

The paper analyses subject scope of four index,feature,similarities and differences.

世界著名的科学引文索引、工程索引、科技会议录索引和科学评论索引，是世界四大科技文献检索系统，是国际公认的进行科学统计与科学评价的重要检索工具。

Coordinate sequence method is made up of the instruct information of polygon boundary x, y coordinate. It is the easiest polygon vector encoding method. The file structure of this method is easy, but because of the polygon boundary has stored two times, it will produce data redundancy, moreover, short of neighbor threshold information; Tree index encoding method make all the boundary points digitizing, store the coordinate sequence, connect the point index to boundary line, and then connect the line index to other polygons, so as to the tree index structure has came into being. It eliminates neighbor polygons boundary data redundancy problems; Topology structure encoding method is a method which by setting up a complete topology relationship structure, resolve the neighbor threshold and island information process problem. However, it makes arithmetic more complicated and makes database bigger.

坐标序列法是由多边形边界的x，y坐标对集合及说明信息组成，是最简单的一种多边形矢量编码法，文件结构简单，但多边形边界被存储两次产生数据冗余，而且缺少邻域信息；树状索引编码法是将所有边界点进行数字化，顺序存储坐标对，由点索引与边界线号相联系，以线索引与各多边形相联系，形成树状索引结构，消除了相邻多边形边界数据冗余问题；拓扑结构编码法是通过建立一个完整的拓扑关系结构，彻底解决邻域和岛状信息处理问题的方法，但增加了算法的复杂性和数据库的大小。

When should searching engine spider to get when requesting a certain URL 404 condition are responded to, know this URL namely already invalidation, index no longer this webpage, feedback to delete this URL denotive webpage from inside index database to data center, of course, delete a process to need for a long time likely, and when should searching engine to get 200 condition are responded to, can think this Url is effective, can index, can collect its index database, such result is these two different Url have identical content: Define the content of 404 wrong pages oneself, this meeting is brought about appear duplicate webpage problem.

当搜索引擎蜘蛛在请求某个URL时得到404状态回应时，即知道该URL已经失效，便不再索引该网页，并向数据中心反馈将该URL表示的网页从索引数据库中删除，当然，删除过程有可能需要很长时间，而当搜索引擎得到200状态回应时，则会认为该url是有效的，便会去索引，并会将其收录到索引数据库，这样的结果便是这两个不同的url具有完全相同的内容：自定义404错误页面的内容，这会导致出现复制网页问题。

The ProductID column in the Products table is the primary key, and an index has also been created on the CategoryId column (to create an index in the designer, just right click on a column and select "Indexes/Keys" to bring up the Index manager dialog).

Products 表中的的 ProductID 字段是它的主键（也是一个自动标识的索引键值），而 CategoryId 字段同样是一个索引字段（要创建一个索引字段，只需要右击字段，选择&Indexes/Keys&就会弹出索引管理对话框）。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。