Tuvalu is growing into a digital nation built one pixel at a time

When the entire nation fits into just 26km² of low-lying coral atolls threatened by climate change, mapping the country takes on a new meaning. For Tuvalu, which hit the headlines in 2021 when a video of the sinking island nation went viral, a georeferenced digital twin of the entire country will serve as evidence and a collective memory of land that may be underwater within decades.

Tuvalu, a Pacific island nation of around 11,000 people, is already experiencing severe climate change impacts. Saltwater intrusion, chronic flooding and coastal erosion are reshaping the islands in real time. King tides force bulldozers onto the runway to push the tarmac back onto its coral foundation. In response, alongside constitutional reform and a landmark climate-refuge treaty with Australia, Tuvalu is doing something unprecedented: building a digital nation. Underpinned by full 3D Lidar scans and 360° street-level imagery, the government is creating a high-resolution digital twin of its territory and culture in the ‘Future Now’ Digital Nation initiative. This includes creating a digital twin of all its islands, paired with digital governance tools such as online elections and digital passports. It has even amended its constitution to declare that its statehood and maritime zones remain permanent, even if parts of its land – or the entire physical country – should sink below the waves.

PLACE: a mapping data trust

PLACE has been tasked with capturing the reality. Rather than being a traditional commercial mapping provider, PLACE is a global non-profit technology organization with a clear mission: to build a mapping data trust ‘for people and planet’. Its model contains several aspects that are particularly important for small island states like Tuvalu:

·         Government ownership: PLACE collects high-resolution aerial and street imagery at no cost to governments, who retain ownership of the data. A copy is placed into a UK-based data trust that holds it in perpetuity for public-interest uses.

·         Ethical sharing: The trust licenses data to a global community of users who work on climate resilience, urban development and other public-good projects, under conditions that respect privacy and national sovereignty.

·         Capacity building: PLACE insists on working with local survey and land-office teams, turning each capture campaign into on-the-job training for national staff who will maintain and use the data long after the field team leaves.

Mapping Tuvalu for cultural preservation

In 2019, the United Nations Development Programme implemented the Tuvalu Coastal Adaptation Project (TCAP). This was the first step towards mapping Tuvalu’s topography and surrounding seafloor using small aircraft with Lidar scanners. Combined with tide gauges and sea-level observations, this finally gave Tuvalu a complete picture of how water levels relate to ground height across all its islands.

To build on this foundation, in 2023 Tuvalu signed an agreement for the PLACE team, supported by the Pacific Community’s Digital Earth Pacific programme, to collect detailed mapping data for all 26km² of land. In early 2024, PLACE flew an eVTOL uncrewed aerial vehicle (UAV) that captured more than 1,000 geotagged images of reef shapes, shorelines and built-up areas. 

Next, a Mosaic 51 360° camera was mounted on a truck to capture panoramic imagery at survey-grade positional accuracy along every road in Funafuti. The same camera was mounted on a backpack for areas accessible only on foot, such as narrow paths or causeways with unstable ground.

Lastly, photogrammetry and ArcGIS Reality workflows then transformed these images into true orthophotos, 3D meshes, a detailed digital surface model (DSM) of the atoll and dense point clouds that form the backbone of a national digital twin. Existing Lidar data and tide information were integrated to model flooding and shoreline change. 

Using mobile mapping for decision-making

Now the data capture is complete, ArcGIS Reality is being used to turn raw images into a multi-scale digital twin. It contains 2D products (true orthophotos and change detection outputs comparing 2019 and 2024 imagery), 3D products (detailed 3D meshes and point clouds with Lidar) and derived analytics (machine learning models for feature extraction, flood exposure maps and analysis of solar-panel potential).

The Tuvalu government is working towards digitizing the archives, preserving songs and language, conducting elections, and hosting an immersive virtual version of Tuvalu – all on the backbone of 360° imagery, Lidar and point cloud technology. At the same time, treaties such as the Falepili Union with Australia are creating new forms of climate mobility. From a legal perspective, scholars have pointed out that there are no settled rules yet for ‘digital states’. Traditional international law assumes a permanent, physical territory, but Tuvalu and other Pacific states are pushing for recognition that maritime boundaries and statehood can remain fixed even as coastlines shift.

Takeaways for the geospatial world

The technical achievements for Tuvalu’s Digital Nation initiative are impressive. But there are also lessons to be learned about citizenship and sovereignty as landscapes shift under climate change:

1. High-quality data is a human rights issue, not just a technical one

Tuvalu’s leaders have been very clear that their mobile mapping project is about preserving their culture and legal rights, not just high-tech 3D models. If the geospatial industry accepts that premise, then designing systems that make high-quality mapping affordable and sustainable for vulnerable nations becomes a moral obligation, not an optional corporate sustainable responsibility (CSR) project.

2. Durability and simplicity matter as much as specs

It is tempting to chase higher point densities and bigger sensors, but not when those increased specs come at the expense of the hardware’s ruggedness. When operating thousands of kilometres from a service centre, on roads that flood, and in intense humidity, ‘it works’ is a feature. This project is a reminder of the importance of reliability and repeatability.

3. Open ecosystems enable sovereign digital futures

PLACE’s business model, Esri’s ArcGIS Reality workflows and Mosaic’s open formats form an ecosystem that enables Tuvalu’s government to manage its data as needed. The possibilities include hosting data where it chooses, sharing carefully with international partners and researchers, and keeping post-processing options open as tools evolve or are phased out.

Conclusion

Tuvalu is the first of many countries that will have to grapple with these existential questions. Other small island countries, low-lying delta regions and even coastal megacities are already facing similar climate-related challenges. Reality capture and digital twin creation can help to manage risk and preserve heritage. The partnership between PLACE, ArcGIS, the Tuvalu government and Mosaic is one example of how the geospatial community can work together and respond to the demands of mobile mapping in the most vulnerable regions.