查询词典 information retrieval

The following results are made from this research: Assessing data quality and band combination of different bands in line with geo-target features in desertification areas, and determining basic bands for desertification monitoring. And understanding and studying the spectral features and variation rules of geo-targets in the experimental area, raising that it is the basis of geo-targets information collection with imaging spectrometer data to understand spectral features and variation rules of geo-targets, realizing that in a great extent spectral-integrated-form-based classification method can remove the phenomenon of "different spectrum with same objects" resulted from reflection ratio curve translation because of the angle change among sensor, targets and observation direction, and the average and variance images can be introduced to solve the problem of two kinds of geo-target with similar spectral forms and much different values of whole reflectionratio. It is suggested that "red edge" range bands of vegetation, which has close relationship with vegetation cover and biomass, is the main characteristic bands and important basis for careful vegetation classification and quantitative retrieval, and pixel-based derivative spectral analysis is very useful for removing the effects of soil background values and quantitatively retrieving vegetation biomass and cover. The remote sense quantitative retrieval model is developed for main appraisable factors of desertification monitoring assessment with imaging spectrometer data and then the applicability of model is analyzed.

研究结果如下：首先针对荒漠化地区的地物特征，对高光谱数据不同波段的数据质量、波段组合进行了评价，提出了适用于荒漠化监测的基本波段选择集；初步了解和掌握了研究地区的地物光谱特性及变异规律，进一步明确了掌握地物光谱特征和变异规律是用成像光谱仪数据提取地物信息的基础；发现了基于光谱整体形状的分类方法在很大程度上能够消除由于传感器、地物目标观测方向之间的角度变化引起的反射率曲线整体平移的&同物异谱&现象，对于谱形相似而整体反射率的值相差较大的两类地物，通过引入均值和方差图像参与分类得到解决；研究还表明在植被&红边&范围内的波段是进行荒漠化监测的主要特征波段，这些波段与植被生物量和盖度都有密切的关系，是开展精细植被分类研究和植被定量反演的重要基础；像元的导数光谱分析可以消除土壤背景的影响，是进行植被生物量和盖度定量反演的有力工具；建立了荒漠化监测主要评价因子的定量反演模型，并分析了模型的适用性。

The content\|based retrieval system for remote sensing images （CBRSIR has become resultingly a hot research field with the potential to retrieval interesting information from image databases automatically and intelligently.

随着遥感图像数量的急剧增加，如何进行高效检索已成为遥感图像信息提取和共享的瓶颈问题，基于内容的遥感图像检索因此逐渐成为了研究热点。

In essentially, ontology is the des cription of the relationships between objective concepts, so the information retrieval technology based on ontology provides knowledge and semantic matching, also, it makes up the bug, and it will be more round and precision than the traditional retrieval technology that based on keywords and database.

本体是对客观概念和概念之间关系的规范和描述，因此基于本体的信息服务检索是基于知识的、语义上的检索，它弥补了传统的基于关键字的检索技术的缺陷，从而在查准率和查全率上有更好的保证。

Since the concept-based retrieval is one of the most important ways of intellectualized information retrieval.

概念检索是实现智能信息检索的重要方式之一。

This paper studied the effects of using of link information for Web IR in TREC experiment,including link anchor text,link structure and the combination of link-based retrieval and traditional content-based retrieval.

摘要］ 本文通过TREC实验研究基于链接信息的检索对Web信息检索的影响，包括使用链接描述文本，链接结构以及将基于链接的方法和传统基于内容检索的方法合并。

In this paper,a commodity information retrieval model is presented, which integrates semantic retrieval and multi-attribute decision method.

提出一种结合语义检索和多属性决策方法的商品信息检索模型。

The retrieval of archaeological information is developing from nonstandard classification of books to standard descriptors method.A good AMIRS will promote to set up the system from index and management to retrieval and use.

我国考古界的情报资科检索工作正从非规范的体系分类法向规范的主盟词法发展；一个好的 AMIRS 将促进建立从标引、管理到检索、利用的考古主题词法情报工作体系。

A retrieval method based on multiple sub-clustering centroids with relevance feedback The performance of relevance feedback technique in image retrieval is not stable in many settings, and more feedback information does not ensure more improving in effectiveness.

由于图像内在的复杂性，唯一的全局检索点通常难以准确覆盖用户的检索目标，使得反馈对检索效果的改进表现出不稳定性。

With library digitalizing process moving forward continuously, digital library will be not only a information retrieval and service system based on digitalization resource or resource system, but also a kind of the development mechanism to get together information resource, information service and information use campaign with user as core.

随着图书馆数字化进程的不断推进，数字图书馆将不仅是一个基于数字化资源的信息检索和服务系统或资源系统，而是一种以用户为核心来聚合信息资源、信息服务、信息利用活动的动态机制。

Geospatial information resources directory service system, used to collect, store, use and manage geospatial information resources directory contents, through the metadata description and retrieval mechanism, localizes and discoveries the geospatial information resources, realizing the system that shares geospatial information resources.

地理空间信息资源目录体系是采集、存储、使用和管理地理空间信息资源目录内容，通过元数据描述和检索机制，定位和发现地理空间信息资源，实现地理空间信息资源共享的系统。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。