Developing An Algorithm To Measure The Quality of The Cadastre

If you’re standing next to a fence, and that fence determines where your property boundary is, it is understandable that you’d expect the positions to be accurate. We have embarked on a new project to let you know just how accurate those positions are.

Property boundaries are given by the cadastre, and there are many changes currently taking place with the cadastre, least of which is the upgrade to a digital cadastre. In New South Wales, the team at Spatial Services are thinking ahead – they are working out exactly how accurate each point on the cadastre is. This means, you’ll know if your fence really is on your property’s boundary, or not.

Not only does NSW boast astounding coastlines, pristine beaches and rolling hills, their historical cadastre data sets are plentiful. This enables statisticians to develop models and statistical analysis techniques able to compare points over time. And, as the points become more accurate, they can model the accuracy of given points over time. So, when you’re standing at the fence and you believe your position to be X, we will be able to say with Y per cent confidence you’re within ± Z cm of that actual position.

You might not understand the importance of this work, but as we move more and more into the digital space, knowing the accuracy as well as the confidence of that accuracy has many implications for surveyors, property owners and data agencies. It will also build confidence in these new data sets.

FrontierSI will be working closely with our partner Symbolix on building statistical analyses and the resulting models. We will work with the team at New South Wales Spatial Services so they can manage the expectations of their stakeholders who use the cadastre.

This project will also set an example for other jurisdictions to build on. Showcasing how we can work together to proactively ensure new data and new platforms meet the expectations of those who use and rely on them every day, and those who may only use them once in their lifetime.