Cadastral Coordinates: A Case Study

UNSW School of Surveying and Geospatial Engineering

Overview

This project comprised of two main components. The first was background research and literature review and the second was a case study in cadastral coordinates. The background literature covered included:

  • Theory on cadastral coordinates
  • A paper on transitioning from a metes and bounds system to a coordinated cadastre
  • Papers on the practical implementation of a coordinated cadastre
  • Previous student theses on cadastral modelling

The case study used two different software to build a cadastral model for comparison purposes. The first software used was Fixit4 written by Dr Bruce Harvey. This programme is a rigorous least squares adjustment programme. It can be used to adjust many different types of data but it can also use title plan dimensions to adjust a cadastral network and output a series of coordinates.

The second programme is called GeoCadastre. This was specifically designed to build cadastral models using plan data. Both software have contrasting adjustment methods and input styles.

Aims

The aims of this thesis project were to gain a better understanding of:

  • Theories
  • Principles
  • Challenges
  • Issues

Involved in cadastral modelling and use these skills to build my own cadastral model.

Site Details

The site chosen to construct a cadastral model of was the O'Brien's Estate area in Hurstville, Sydney. This was chosen due to the fact that there have been previous students theses done in the same area so data is freely available.

Site Aerial

Aerial image of the site

The site is oulined in red above. It consisted of 98 deposited plans and 239 individual parcels. The total number of parcel corners in the adjustment was 608, this is the number of coordinates in the adjustment.

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