PD-17 - SQL Languages for GIS
SQL (Structured Query Language) is a declarative programming language that is closely linked to the relational database model. It is an accessible and widely adopted language used for query, data modification, and data definition—that is, defining data structures (tables) and other database objects. Important additions to the SQL standard include SQL/PSM, which adds control flow, local variables, and other procedural language features; and SQL/MM Part 3, which adds spatial support. Many complex geoprocessing workflows typically implemented in desktop GIS or scripting languages can easily be implemented in spatial SQL.
PD-18 - SpatialMPI: Message Passing Interface for GIS Applications
MPI (Message Passing Interface) is a widely used message passing library for writing parallel programs. The goal of MPI is to establish a portable, efficient, and flexible standard for message passing that will be widely used for writing message passing programs. This chapter motivates the need for using MPI for implementing GIS applications and introduces MPI data types and communication functions. Then, it presents new spatial data types and operations on them using MPI. Finally, it presents pseudocode for parallelizing a range query problem and spatial domain decomposition in GIS.