The postcode system is used to ensure the efficient organisation of items of mail within the UK. In recent years the postcode system and its implicit geography has become important also for georeferencing.
Postcode geographies are important as many non-census datasets use the postcode as the geographic referencing mechanism.
So far we`ve seen that there are a number of different types of geographical regions in use in the UK and we have explored in detail, the important aspects of these. These geographical regions are held digitally as digitised boundary datasets. They can also be referenced in a dataset known as a geographical lookup table. In the rest of this module we will explore these digital representations of geography.