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- Infinitely variable map scale spatial database 面向无级比例尺的空间数据仓库索引技术研究
- Selectivity Estimation is the base of spatial database query optimizer. 选择性估计是设计空间数据库查询优化器的基础。
- By applying wavelet analysis method to image edge detection,multi scale operator of wavelet analysis functions well for noise resisting ability and picture edge reserving. 将小波分析方法应用于图像边缘检测领域,小波分析的多尺度算子在抗噪声和保留图像边缘的能力上有比较好的效果。
- Jing Ning, born in 1963.Professor and Ph.D. Supervisor.His main research interests include GIS and spatial database. 景宁,1963年生,教授,博士生导师,主要研究方向为地理信息系统、空间数据库。
- Spatial database for railway is the foundation of Railway Geographic Information System (RGIS). 摘要铁路空间数据库是铁路地理信息系统(RGIS)的基础。
- It can handle spatial data and spot any-shape clusters in a noised spatial database by dividing them into clusters with high enough density. 该算法将具有足够高密度的区域划分为簇,并可以在带有“噪声”的空间数据库中发现任意形状的聚类。
- Using multi scale DEM datum, multi scale topographic index are extracted and mapped in the whole country and sample area in bess plateau, which prepare topographic datum basis for developing regional soil and water loss assessment model. （2）利用多尺度的DEM数据，提取了多尺度的水土流失地形指标，编制了全国及黄土高原典型样区的水土流失地形指标专题图件，为多尺度区域水土流失评价模型的建立准备了地形数据基础。
- SDM is different from the classical data mining in that spatial database have its own characters compared with relational database (RDB). 空间数据有许多不同于非空间数据的特性，使得空间数据挖掘与一般数据挖掘相比亦有其鲜明的特征。
- The conception of multi-scale Hilbert spectrum entropy(MSHSE)was proposed based on the multi scale analysis character of the local wave method(LWM)and its calculation method was developed. 基于局域波分析的时频多分辨特性,提出了多尺度Hilbert谱熵的概念,并给出了多尺度Hilbert谱熵的计算方法。
- This paper classify a series of methods on spatial database index, and introduce the QR-tree index structure with very large spatial database. 在综述现有空间数据库索引技术的基础上，提出了一种面向大型空间数据库的QR-树索引方法。
- This paper describes a method to extract multi scale textural information from satellite SAR image using wavelet transformation. Then data fusion between satellite SAR image and TM image is implemented based on the wavelet texture information. 论述利用小波变换提取合成孔径雷达 (SAR)图像的多尺度纹理信息 ,基于小波纹理信息将SAR图像与TM图像进行融合。
- The data storage is based on RDS, design spatial database under the direction of object oriented concept and realize object storage. 数据的存储是以现有的关系数据库为基础,以面向对象的思想为指导来设计空间数据库,实现对象的存储。
- The City Air Pollution Numerical Prediction System (CAPPS) consists of MM5 (or MM4) and the multi scale grid box model based on the integral of the atmospheric advective dispersion equation. 城市空气污染数值预报系统CAPPS ,是在ADPIC的概念的基础上经过积分求得的大气平流扩散的多尺度箱格预报模型。
- However there are some problem in the content and system of spatial database course and the standard teaching mode has not been formed. 但由于种种原因，空间数据库课程在课程体系、课程内容、教学模式等方面仍然存在许多问题和不足。
- Lossless compression bounds of images naturally acquired by various imaging sensors are estimated using a practical method based on multi scale conditional entropy and memory measurement. 为估计利用各类成像传感器自然获取图像的无损压缩极限,提出一个利用多尺度条件熵和记忆性度量的实用方法。
- ArcGIS extends ArcView by providing multi-userediting, advanced analysis, Internet services, and highperformance spatial database services. 在 ArcView 中，无论用view，table，chart，layout或script哪一种方式来对数据进行检索、查询、统计分析或生成图，都是通过对专题(theme)，特征(feature，又作要素)，属性(attribute)，字段(field)进行操作来实现。
- With the penetration of geographical information system in people's lives,NL-oriented spatial database query has been noticed. 随着地理信息系统深入应用于人们的日常生活,面向自然语言的空间数据库查询的研究越来越被人们重视。
- To query the spatial database effectively, this paper constructs a new spatial index structure (MC tree) and also presents the properties and updating-arithmetics of the MC tree . 根据空间数据库的查询要求,本文构建了一种新的空间索引结构(MC树),并给出了MC树的性质和相关更新算法。
- Mining spatial association rules can be used to discover the specific spatial relationship between spatial predicate and non-spatial predicate in the spatial database. 空间关联规则挖掘可应用于发现空间数据库中大量空间谓词与非空间谓词之间的特定空间关系。
- The evaluation section of the spatial database consisted of the overlayed patches the current land use map and the basic farmland protection map and the soil map. 耕地地力评价单元通过叠加土地利用现状图、基本农田保护区规划图和土壤图所形成的图斑组成。
