Central Coast's duplicate image problem: how the region stacks up against cities tackling the same digital planning headache

Central Coast Council is sitting on a digital asset library estimated to contain thousands of duplicate and outdated property images, a byproduct of the 2016 merger that stitched together the former Gosford City Council and Wyong Shire Council into a single, unwieldy organisation. The problem is not cosmetic. Planners, developers, and community groups using the council's online mapping and development application portals have encountered imagery that no longer matches the built reality on the ground — a gap that, in a region undergoing rapid urban change, carries real planning and accountability risk.

The timing matters. Central Coast Council only exited formal financial administration in May 2023 after a period of oversight by state-appointed administrator Rik Hart. Rebuilding functional, trustworthy digital infrastructure is now part of the council's broader recovery work. At the same time, the Gosford CBD is mid-transformation, with construction activity along Mann Street and around the Gosford Waterfront precinct meaning that aerial and street-level imagery can become outdated within months, not years.

What the comparison with other councils shows

In Wollongong, Illawarra Shoalhaven Regional Planning Panel members raised concerns in 2024 about inconsistencies in cadastral mapping images submitted with development applications, prompting Wollongong City Council to begin a staged audit of its GIS image holdings. The Dutch city of Rotterdam — often cited in urban planning circles for its digital twin program — has been deduplicating its city imagery database since 2021 as part of a broader smart-city initiative, with the municipality publicly reporting a reduction in storage overhead and faster load times on public-facing planning portals. Newcastle City Council in the Hunter, dealing with a similar post-merger data legacy from its 2016 amalgamation with Port Stephens in administrative discussions, has invested in automated image-matching software to flag duplicates before they reach public-facing systems.

Central Coast's approach has been slower and less systematic, according to planning professionals who work regularly with the council's online DA tracker. The council's Geographic Information Services team, based at its main Gosford administration offices on Mann Street, has acknowledged the issue in internal workflow documents, though no public timeline for a full audit has been released. The lack of a dedicated remediation program puts the council behind peers of comparable size.

Why Gosford and Tuggerah feel the pinch most

Two centres carry the most exposure. The Gosford CBD renewal — supported by the NSW Government's $2.6 billion Central Coast City Deal framework discussions — is generating new building stock faster than legacy imagery systems can keep pace with. Architects and planning consultants lodging DAs through the NSW Planning Portal have reported pulling site images that show cleared lots where multi-storey buildings now stand, or vice versa. The Tuggerah Business Park precinct, the region's largest commercial employment zone, has a similarly volatile image record given the volume of industrial construction since 2020.

The practical risk is not trivial. Under the Environmental Planning and Assessment Act 1979, applicants are required to accurately represent existing site conditions. Where council-supplied imagery contradicts a submitted site analysis, it can trigger objections, delays, or requests for additional information — adding weeks and cost to applications already navigating a stretched assessment pipeline. The council processed 4,841 development applications in the 2022–23 financial year, according to its published annual report, making image integrity a systemic issue rather than an edge case.

What happens next depends largely on whether the council prioritises this inside its current digital transformation budget cycle, which runs to June 2027. Planning advocates, including the Central Coast Chapter of the Planning Institute of Australia, have previously called for greater investment in council GIS infrastructure as part of submissions to the state government's housing reform consultations. The most immediate step any applicant or community member can take is to cross-reference council imagery against the NSW Spatial Services SIX Maps platform, which is updated on a rolling basis and remains independent of council data holdings. For a region betting its economic future on fast rail, a revitalised Gosford waterfront, and a steady supply of housing for Sydney commuters, getting the digital foundations right is not a background task — it is core infrastructure.