支持栅格数据的GSQL扩展研究

刘瑜; 林星; 秦适; 张毅; 邬伦

doi:10.11834/jig.20050121

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专辑

支持栅格数据的GSQL扩展研究
Research on GSQL Extension Supporting Raster Data
2005年10卷第1期页码：113
纸质出版：2005
DOI： 10.11834/jig.20050121
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刘瑜, 林星, 秦适, 张毅, 邬伦. 支持栅格数据的GSQL扩展研究[J]. 中国图象图形学报, 2005,10(1):113. DOI： 10.11834/jig.20050121.

Research on GSQL Extension Supporting Raster Data[J]. Journal of Image and Graphics, 2005, 10(1): 113. DOI： 10.11834/jig.20050121.

摘要

空间数据库已经成为实现海量空间数据管理的高效手段，在空间数据库设计和实现中，定义GSQL是其关键。目前，针对于矢量数据访问已经有许多学者进行了研究，但对于地理栅格数据，其访问和操作接口却尚无相关规范，为此参考OpenGIS，对该方面进行了研究，即首先定义了与栅格相关的抽象数据类型，其分别为Pixel(栅格点)、RasterRegion(栅格区域)、RasterCoverage(栅格覆盖)，它们之间存在聚合关系；然后对每种数据类型进行了定义，包括其数据对象以及相关操作；进而，基于上述抽象数据类型，给出了支持栅格数据访问的GSQL—R描述以及相关实例。通过实例表明，GSQL—R能较好支持矢量／栅格一体化的数据访问和操作。

Abstract

Spatial database has become one of the dominating techniques tomanage spatialdata in geographical information systems

and geographic structured query language (GSQL) is the key issue ofspatialdatabase design and implementation. Atpresent

GSQL for vector data has been widely studied. However

when considering the raster data

little researchwas made for their specifications on visiting and operationa.l Based on OpenGIS○R

a GSQL extension named GSQL2R supporting raster data is discussed in this paper. At first

some abstractdata types (ADTs)

includingPixe

l RasterRegion and RasterCoverage

are defined. The relationships between Pixel/RasterRegion and RasterRegion/RasterCoverage are part/whole. In these definitions

data objects and operations for each ADT are described in a formalized way. Then

GSQL2R syntax and some instances are presented. The GSQL2R description includes three parts

.i e. data definition language (DDL)

data table schema and data manipulation language (DML). The example indicates that GSQL2R provides an efficient and integrated way for raster data access and operation.