SSD '90 Proceedings of the first symposium on Design and implementation of large spatial databases
Efficient query processing in geographic information systems
Efficient query processing in geographic information systems
Spatial SQL: A Query and Presentation Language
IEEE Transactions on Knowledge and Data Engineering
An Efficient Pictorial Database System for PSQL
IEEE Transactions on Software Engineering
Geo-Relational Algebra: A Model and Query Language for Geometric Database Systems
EDBT '88 Proceedings of the International Conference on Extending Database Technology: Advances in Database Technology
Geo-SAL: A Query Language for Spatial Data Analysis
SSD '91 Proceedings of the Second International Symposium on Advances in Spatial Databases
Extending a DBMS with Spatial Operations
SSD '91 Proceedings of the Second International Symposium on Advances in Spatial Databases
A Small Set of Formal Topological Relationships Suitable for End-User Interaction
SSD '93 Proceedings of the Third International Symposium on Advances in Spatial Databases
SIGGRAPH '82 Proceedings of the 9th annual conference on Computer graphics and interactive techniques
Personalized local internet in the location-based mobile web search
Decision Support Systems
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A spatial query language called SQL/Spatial has been designed to support the expression of user requests dealing with a variety of GIS analysis functions (e.g., map overlay and buffer) in the Web environment. Using the familiar SELECT - FROM - WHERE statement instead of procedural commands like macro language in some GIS packages, users can formulate their queries more easily, while conducting powerful spatial data retrieval and analysis. The language investigates an appropriate structure to express spatial queries within the framework of the on-going SQL standards for spatial extensions (i.e., Open GIS Simple Features Specification for SQL and SQL3 MultiMedia Specification Part 3: Spatial). By restructuring the FROM clause via a subquery, SQL/Spatial is well adapted to the general spatial analysis procedure by using current GIS packages, while conforming well to the SQL design concepts. The interface (client) of the language resides with a Web browser, while the query is processed by a query server. The query server, linked to the Web server via Common Gateway Interface (CGI) scripts, is composed of a query processor, Spatial Database Engine (SDE) and MapObjects Internet Map Server. It was demonstrated that the design of SQL/Spatial facilitates the access to spatial analysis functionalities on the Web.