地理信息 简单要素查询-1
|
| 作者：不详 来源：不详 更新时间：2008-3-27 10:16:02 |
 减小字体
 增大字体
|
| 编 号 | 19125-1 | | 名 称 | 地理信息 简单要素查询-1：
Common architecture Geographic information - Simple feature
access - Part 1: Common architecture | | 负责人 | Mr. John R. Rowley （文字编辑：Mr. Keith Ryden） | | 工作组 | 第4工作组 | | 进 展 | 工作阶段 计划完成时间
各阶段相关最新文件
国际标准（IS）: 2003年5月 无
最终国际标准草案（FDIS）: 2003年2月 无
√ 国际标准草案（DIS）: 2000年11月 DIS
19125-1
√ 委员会草案（CD）2: 2000年8月 N 932
√ 委员会草案（CD）: 1999年11月 N 821
√ 工作草案（WD）: 1999年9月 无
前面打“√”的为已完成阶段 | | 范 围 | This International Standard will:
- provide an implementation specification
for the SQL environment conformant with the Simple feature access - abstract
specification (Currently a New Work Item Proposal);
- specify an SQL schema that supports
storage, retrieval, query and update of simple geospatial feature
collections;
- establish an architecture for the
implementation of feature tables;
- define terms to use within the
architecture;
- apply to both SQL Components and SQL
with Geometry Types Components;
- describe a set of SQL Geometry Types
together with the SQL functions on those types;
- not attempt to standardize any part of
the mechanism by which the Geometry Types are added to and maintained in the
SQL environment. | | 目 的 | The purpose of this New Work Item Proposal (NWIP) is to provide an implementation specification for the SQL environment that industry can use. This NWIP is based on the attached tested document: The OpenGIS( Simple Features Specification For SQL Revision 1.1.
This work includes the definition of a standard SQL schema that supports storage, retrieval, query and update of simple geospatial feature collections. A simple feature has both spatial and non-spatial attributes. Spatial attributes are geometry valued, and simple features are based on 2D geometry with linear interpolation between vertices.
Simple geospatial feature collections will conceptually be stored as tables with geometry valued columns in a Relational Database Management System (RDBMS); each feature will be stored as a row in a table. The non-spatial attributes of features will be mapped onto columns whose types are drawn from the set of standard SQL ISO/IEC 9075 data types. The spatial attributes of features will be mapped onto columns whose SQL data types are based on the underlying concept of additional geometric data types for SQL. A table whose rows represent these features will be referred to as a feature table. Such a table will contain one or more geometry valued columns. Feature table implementations are described for two target SQL environments: SQL and SQL with Geometry Types.
In the SQL environment, a geometry-valued column is implemented as a Foreign key reference into a geometry table. A geometry value is stored using one or more rows in the geometry table. The geometry table may be implemented using either standard SQL numeric types or SQL binary types; schemas for both are described.
The term SQL with Geometry Types is used to refer to an SQL environment that has been extended with a set of Geometry Types. In this environment a geometry-valued column is implemented as a column whose SQL type is drawn from the set of Geometry Types. The standard SQL mechanism for extending the type system of an SQL database is through the definition of user defined Abstract Data Types. Commercial implementations of SQL environments with user defined type support have been made available from 1997.
The GIS developers will benefit from this standard. This standard will ensure a good fit with the developing ISO 15046 standard.
The support document attached has been implemented by two major companies and tested by a third party organization demonstrating both the need by industry and the stability of the technology.
As this work is beginning to be used by major organizations there is a need for this standard as soon as practical.The target date for completion is April 2000. | | 其 它 | 立项时间：1999年8月 立项文件：N 732 N 760 |
|
|
[]
[返回上一页]
[打 印]
|
|
|
您当前的位置：