How the Central Coast Is Tackling Duplicate Digital Infrastructure — and Where It Lags Behind Global Peers

Central Coast Council is working through a backlog of duplicate spatial imagery embedded across its asset management and development assessment platforms — a problem that has quietly inflated storage costs, slowed planning approvals in the Gosford CBD renewal precinct, and complicated flood-mapping updates along the Wyong River corridor. The issue is not unique to the Coast, but the way local government here is handling it offers a telling comparison with similar-sized councils in the UK, Canada and New Zealand that have moved faster.

The timing matters. Sydney recorded its hottest June since records began in 1859, which has pushed councils across New South Wales to update climate and flood resilience mapping more urgently. When spatial databases carry duplicate or conflicting imagery layers, those updates take longer and cost more. For a council that only exited formal administration in 2022 after years of financial dysfunction, every delay in digital housekeeping carries real consequences for both budgets and public trust.

What the Problem Actually Looks Like on the Ground

In practical terms, duplicate image replacement is the process of auditing geographic information system (GIS) libraries, identifying redundant aerial photograph layers — sometimes three or four versions of the same Gosford CBD block or the Entrance Road flood plain — and replacing them with a single, authoritative current image. It sounds administrative. The downstream effects are not.

Central Coast Council's GIS environment, managed through its Wyong and Gosford offices, runs on a shared spatial platform that absorbed legacy datasets from the former Gosford City Council and Wyong Shire Council when the two merged in 2016. That merger left a known duplication problem across planning layers. Council has been working since at least 2023 to rationalise those datasets under its broader digital transformation program, but as of mid-2026 the project has not been publicly declared complete. The Gosford Waterfront Urban Design Framework — a key document underpinning CBD renewal — relies on accurate current aerial basemaps, and planning staff have flagged internally that inconsistent imagery creates version-control headaches during development assessment.

Two specific local programs intersect with this work. The NSW Government's Spatial Digital Twin, which provides statewide aerial and LiDAR coverage updated on a rolling basis, is intended to give councils like Central Coast a single authoritative image source rather than maintaining their own duplicated archives. Separately, the council's asset management modernisation program, tied to conditions set during its administration period, includes GIS rationalisation as a deliverable.

How Other Cities Are Doing It

The comparison with peer cities is instructive. Christchurch City Council in New Zealand, which rebuilt its spatial infrastructure after the 2010–11 earthquakes, completed a full duplicate-layer audit of its GIS environment by 2021 and now operates a single-source aerial imagery library refreshed every 18 months. Tauranga City Council — also a council that went into commissioner management, in 2021 — made GIS rationalisation an explicit condition of its recovery plan, completing the work within 18 months of commissioners taking control.

In the UK, Cornwall Council, which covers a population and geographic footprint roughly comparable to the Central Coast, moved to the Ordnance Survey's National Geographic Database as its sole basemap in 2022, eliminating an estimated 40 percent of its duplicated spatial layers within 12 months, according to a Local Government Chronicle report published that year. That figure — 40 percent redundancy — aligns with estimates from spatial data consultants working in the NSW local government sector, who have described similar duplication rates in post-merger councils without citing Central Coast specifically.

The Central Coast's reliance on the NSW Spatial Digital Twin is conceptually similar to Cornwall's OS approach, but the local implementation timeline has been slower. The Digital Twin program itself only reached full statewide aerial coverage in late 2024, giving councils less runway to migrate than their New Zealand or UK equivalents had.

For residents and businesses navigating the Gosford CBD development pipeline, or watching flood-risk overlays being applied to properties near Tuggerah Lake, the practical upshot is this: planning decisions that depend on spatial accuracy will improve as duplicate imagery is retired, but the council has not published a completion date for that rationalisation work. Applicants lodging development applications through the NSW Planning Portal for Central Coast properties should confirm with council staff which imagery vintage is being used as the current basemap for any site-specific assessment — a basic due-diligence step that, for now, still needs to be asked.