The National Environmental Information Infrastructure (NEII) consists of five ICT components detailed in the Engineering Viewpoint of the NEII Reference Architecture.

These include core components such as the metadata catalogue, national environmental monitoring sites register, data viewer and vocabulary service, in addition to web data services for specific data that will be delivered by partner organisations. The NEII Programme is working with its partners to expand the data content within the NEII.

Current operational NEII components include the following: