symmetries in geometry

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ST - Geometry教程

标签:文库时间:2025-02-15
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ArcGIS GeoDatabase ST_Geometry简介

1使用ST_Geometry存储空间数据(oracle)

1.1 简介

ArcSDE for Oracle提供了ST_Geometry类型来存储几何数据。ST_Geometry是一种遵循ISO和OGC规范的,可以通过SQL直接读取的空间信息存储类型。采用这种存储方式能够更好的利用oracle的资源,更好的兼容oracle的特征,比如复制和分区,并且能够更快的读取空间数据。使用ST_Geometry存储空间数据,可以把业务数据和空间数据存储到一张表中(使用SDENBLOB方式业务数据和空间数据是分开存储在B表和F表中的),因此可以很方便的在业务数据中增加空间数据(只需要在业务表中增加ST_Geometry列)。使用这种存储方式还能够简化多用户的读取,管理(只需要管理一张表)。

从 ArcGIS 9.3开始,新的 ArcSDE geodatabases for Oracle 会默认使用ST_Geometry 方式来存储空间数据。它实现了SQL3规范中的用户自定义类型(user-defined data types),允许用户使用ST_Geometry类型创建列来存储诸如界

ArcEngine 中Geometry对象浅析

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ArcEngine 中Geometry对象浅析

本帖最后由 shisanshao 于 2011-4-13 00:12 编辑

ArcEngine Geometry库定义了基本几何图形的矢量表达形式,顶级的几何图形有Points、Multipoints、Polylines、Polygons、 Multipatches,Geodatabase和绘图系统使用这些几何图形来定义其他各种形状的特征和图形,提供了编辑图形的操作方法和地图符号系统

符号化特征数据的途径。

Geometry库中几个核心类和接口构成了Geometry对象的基本框架。

GeometryEnvironment提供了从不同的输入、设置或获取全局变量来创建几何图形的方

法,以便控制geometry方法的行为。GeometryEnvironment对象是一个单例对象。

以下为引用的内容:

1. public IPolyline TestGeometryEnvironment()

2.

{

3. ISpatialReferenceFactory spatialReferenceFactory = new

SpatialReferenceEnvironmentClass();

Idealizer Rings and Noncommutative Projective Geometry

标签:文库时间:2025-02-15
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We study some properties of graded idealizer rings with an emphasis on applications to the theory of noncommutative projective geometry. In particular we give examples of rings for which the $\chi$-conditions of Artin and Zhang and the strong noetherian pr

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aIDEALIZERRINGSANDNONCOMMUTATIVEPROJECTIVEGEOMETRYDANIELROGALSKIAbstract.Westudynoetheriangradedidealizerringswhichhaveverydi er-entbehaviorontherightandleftsides.Inparticular,weconstructnoetheriangradedalgebrasToveranalgebraicallyclosed eldk

Idealizer Rings and Noncommutative Projective Geometry

标签:文库时间:2025-02-15
【bwwdw.com - 博文网】

We study some properties of graded idealizer rings with an emphasis on applications to the theory of noncommutative projective geometry. In particular we give examples of rings for which the $\chi$-conditions of Artin and Zhang and the strong noetherian pr

4

2

n

a

J

7

2

]

A

R

.

th

a

m

[

2

v

2

5

3

/

tha

m

:v

i

Xr

aIDEALIZERRINGSANDNONCOMMUTATIVEPROJECTIVEGEOMETRYDANIELROGALSKIAbstract.Westudynoetheriangradedidealizerringswhichhaveverydi er-entbehaviorontherightandleftsides.Inparticular,weconstructnoetheriangradedalgebrasToveranalgebraicallyclosed eldk

A Geometry Model for Tortuosity of Flow Path in Porous Media

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A simple geometry model for tortuosity of flow path in porous media is proposed based on the assumption that some particles in a porous medium are unrestrictedly overlapped and the others are not. The proposed model is expressed as a function of porosity a

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Symmetries, Conserved Charges and (Black) Holes in Two Dimen

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Two dimensional string theory is known to have an infinite dimensional symmetry, both in the continuum formalism as well as in the matrix model formalism. We develop a systematic procedure for computing the conserved charges associated with these symmetrie

hep-th/0408064

Symmetries,ConservedChargesand(Black)Holes

inTwoDimensionalStringTheory

arXiv:hep-th/0408064v1 9 Aug 2004AshokeSenHarish-ChandraResearchInstituteChhatnagRoad,Jhusi,Allahabad211019,INDIAE-mail:ashoke.sen@cern.ch,sen@mri.ernet.inAbstractTwodimensionalstringtheor

Symmetries, Conserved Charges and (Black) Holes in Two Dimensional String Theory

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Two dimensional string theory is known to have an infinite dimensional symmetry, both in the continuum formalism as well as in the matrix model formalism. We develop a systematic procedure for computing the conserved charges associated with these symmetrie

hep-th/0408064

Symmetries,ConservedChargesand(Black)Holes

inTwoDimensionalStringTheory

arXiv:hep-th/0408064v1 9 Aug 2004AshokeSenHarish-ChandraResearchInstituteChhatnagRoad,Jhusi,Allahabad211019,INDIAE-mail:ashoke.sen@cern.ch,sen@mri.ernet.inAbstractTwodimensionalstringtheor