OSGB Spatial References Module

This module is one of a suite of modules which provide handling of different spatial reference notation systems, in this case the Ordnance Survey British National Grid system. It is only required on warehouses which support British National Grid references for data entry or reporting.

It performs the following tasks:

• Declares the underlying projection’s SRID to be 27700, which is the numeric code given to the OSGB 1936 projection.
• Provides a method for checking the format of a provided spatial reference.
• Provides conversions for British National Grid references to and from a polygon in the underlying projection.