Gaussian Splatting for Construction QA and Progress Tracking: An Australian Field Guide
Hundreds of pre-pour photos and not one of them measurable — that's the documentation problem on most Australian sites. Here's how dated 3D Gaussian Splatting captures turn construction QA and progress tracking into a measurable, shareable 4D record, worked through on a live Queensland seawall build.
Walk any pre-pour inspection in Queensland and you'll see the same ritual. The site engineer circles the formwork with a phone, shooting photo after photo — reinforcement spacing, cover, embedments, conduits, the lot. By handover the project has accumulated thousands of images. Then a question lands six months later — was that starter bar where the drawings said it should be before the pour? — and nobody can measure a single one of them. Photos prove someone was there. They don't prove what was built. That gap is exactly what 3D Gaussian Splatting closes, and after running it on live construction sites across Queensland, we think it's the most practical QA tool to reach a site engineer's hands in a long time.
What 3DGS gives a project team that photos and PDFs cannot
3D Gaussian Splatting (3DGS) came out of SIGGRAPH in 2023 as a rendering technique. Instead of stitching photos into a textured mesh the way photogrammetry does, it represents a scene as millions of small colour-and-opacity gaussians. The practical difference on a construction site is enormous: thin reinforcement steel, wet concrete, safety mesh, reflective barriers — the things that turn photogrammetry meshes into melted soup — render cleanly. It looks like standing there. And because we capture with SLAM LiDAR alongside the cameras, the scene isn't just pretty. It's dimensionally accurate.
Strip away the graphics research and it comes down to three things a project team gets that no photo folder or PDF report can give them:
- →Walk the site as it was on any capture date. Not the six photos someone happened to take — the whole site, from any angle, long after the concrete has gone in.
- →Measure anything. Captured with the Lixel K2, the scene holds under 1 cm relative accuracy and roughly 3 cm absolute via its built-in RTK, with a point cloud and the 3DGS scene produced from the same walk.
- →Share a link. Processed through LCC — with its patented compression running about 90% smaller than open-source 3DGS output — an entire site opens in a browser tab. No install, no viewer licence, no multi-gigabyte file transfer.
That last point is the one that changes behaviour. When the superintendent, the designer interstate and the client rep are all looking at the same scene from the same link, arguments about what the site looked like simply stop. The record settles it.
The Mooloolaba seawall: three dates, one 4D record
The clearest way to show this is a real asset, not a slide. As part of our infrastructure work with Sunshine Coast Council, we captured the Mooloolaba seawall three times across its construction: 5 April during early works, 13 April immediately post-pour, and 20 May with the structure near completion. All three captures are live in our model gallery — real self-hosted 3DGS scenes streamed from our own Australian infrastructure, open in any browser. Go and walk them. This article will still be here.
Three dated captures of one structure is a 4D construction record — a digital twin of the build with time as the fourth axis. Step between dates and the construction sequence is simply there: what sat behind the wall before it was buried, exactly what the 13 April surface looked like the week after the pour, how the works closed out by late May. A progress claim query becomes a five-minute walkthrough instead of a fortnight of email archaeology. A defect conversation starts from measurable geometry, not memory. The site as it was on a given date is now a permanent, measurable fact — and that changes the tone of every downstream conversation.
A photo shows what someone chose to point the camera at. A dated splat shows the whole site — and lets you measure it.
The full lifecycle loop: design to handover
One-off captures are useful. The real return shows up when capture is wired through the whole project lifecycle — the loop we lay out on our capability page:
- →Design overlay — bring the design model into the captured scene and spot divergence early, while it's still cheap to fix.
- →Progress tracking — regular dated captures build the 4D record. Each capture is minutes on foot, not a site shutdown, so a weekly rhythm is actually sustainable.
- →Pre-pour and post-pour QA — capture reinforcement, embedments and in-slab services before they vanish into concrete, then capture again after the pour. The Mooloolaba 13 April scan is exactly this, in the wild.
- →As-built handover — the final capture is the honest as-built. Where the client needs a model, our AI Scan-to-BIM workflow takes one operator through 1,000 m² in about 30 minutes and delivers LOD 400 output.
We've published what that last stage looks like against a traditional multi-person modelling workflow in our 1 vs 3 Scan-to-BIM case study, and the broader capture-to-deliverable pipeline sits under our 3DGS modelling service. The point of the loop is that every stage feeds the next — nothing is captured twice, and nothing is captured for a single use.
Evidence-grade, not just good-looking
Before founding AECT I spent more than seven years in HSEQ across council infrastructure and civil work, and I audit ISO 9001, 14001 and 45001 management systems as a lead auditor. That background shaped how we built these workflows, because a capture is only evidence if it's traceable. Every scan we deliver is dated, and captured on the K2 it's geo-referenced through the built-in RTK — which means it slots directly into ITP hold points and verification records instead of sitting beside them. When your quality system says "inspection evidence retained", a dated, measurable, geo-referenced scene of the entire pour area is a very different standard of evidence than a folder of JPEGs.
Sovereignty matters here too. All our capture and processing runs onshore in Queensland — nothing routes through offshore servers. For clients whose data can't touch the internet at all, we deliver fully air-gapped: a perpetual LCC licence on a physical dongle, no connection required. The same stack equips Queensland Police Forensic Imaging and has been onboarded by Victoria Police's Major Crime Scene Unit — environments where chain-of-evidence standards are unforgiving. Construction QA documentation built on that footing tends to hold up when it's tested.
The ten-minute site visit
The objection we hear most from project teams: "we can't stop works for scanning." You don't. On the Gold Coast Highway we captured a live traffic corridor in a single pass on foot — roughly ten minutes, one operator, no lane closure. Point cloud, 3DGS scene and vector extraction were all published in under a day. The full breakdown is in the Gold Coast Highway case study.
That cadence is what makes genuine progress capture realistic. If a capture costs ten minutes of one person's time, you'll do it every week — and the 4D record builds itself. For larger footprints we fuse aerial and ground capture: a DJI drone over the top, an L2 Pro on the ground, merged into one seamless 3DGS scene through LCC's aerial-ground map fusion. One scene, no blind spots, no separate deliverables to reconcile.
What it takes to run this on your project
Two ways in. The first is putting a scanner in your site engineer's hands. For construction QA we recommend the Lixel K2: under a kilogram, built-in RTK, three cameras for real-time colour, and dual output — point cloud and 3DGS from the same walk. It's from $15,999 inc GST ($16,999 inc GST for the Scan More package), and every scanner ships with three permanent LixelStudio licences. We run training to get crews productive in days, and as XGRIDS National Distributor for Australia our support is local, not a ticket queue in another hemisphere.
The second way is not touching hardware at all. We run capture as a service — from a single pre-pour scan to a standing monthly 4D program. And if you're somewhere in between, hire first: the K2 hires from $250 a day on the Demo-to-Buy rate — $400 a day standard dry hire, $1,600 a week — all inc GST on our public rate card, and our Demo-to-Buy offer credits 100% of hire fees (up to five days) against a purchase within 90 days. Book at aect.solutions/rent. Try it on one pour. If it doesn't earn its place, hand it back.
The fastest way to evaluate 3DGS for construction QA isn't a brochure — it's your own site. We'll run a pilot capture on a live area of your project, process it onshore in Queensland, and hand your team a browser link they can walk through within days. Get in touch to book a pilot capture — or spend ten minutes in the live gallery first and walk the Mooloolaba seawall through all three construction stages yourself.
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