3D Strata data product is a static dataset of registered cadastral strata scheme title plans digitised from plan images. This product does not form part of the dynamic DCDB cadastral web services. It provides access to state-wide visualisation of digitised strata plans and is a complimentary dataset to the official cadastral features within New South Wales. The Strata Plans 3D data is an indicative representation of registered strata plans in NSW. The 3D Strata contains registered land titles only.

Use Limitations

The creation of the 3D Strata data employs industry levels of rigour, skill and care in ensuring the relevance, timeliness, accuracy, coherence, interpretability and accessibility of this data. But does not guarantee the data is without errors, additions or omissions and provides no guarantees as to the usefulness, accuracy or timeliness of the data provided. Data products produced are for research purposes only and should be considered indicative and for representational purposes only. This data may be used in conjunction with cadastral authoritative datasets for visualisation purposes. DCS Spatial Services may at its sole discretion change the type(s) of spatial datasets (or layers) that it makes available.

Lineage

Digital strata plans are derived products produced by georeferencing and deriving features and textual information from the face of the strata title plan image. The textual and diagram information is translated into a computer readable digitised format for storage, viewing and querying in geospatial technologies.

Positional boundary parent parcel features within each digitised strata plan are derived from the NSW Cadastre Lot features. NSW Cadastre web service is a dynamic map of cadastral features extracted from the NSW Digital Cadastral Database (DCDB).

Source: Service Delivery DCS, Spatial Services

Web service access: http://maps.six.nsw.gov.au/arcgis/rest/services/public/NSW_Cadastre/MapServer

Associated Resources

Resource: 3D Buildings

The 3D Buildings are outlines of building that have been created and classified through remote sensing information and provide footprint, elevation, height and roof form features of buildings. This data is 3D enabled using LiDAR datasets in order to create the 3D Building features with a Level of Detail 2.0.

Source: Service Delivery DCS, Spatial Services

Resource: Digital Elevation Model

Bare Earth Digital Elevation Model with 1m resolution. Generated from Classification Level 3 LiDAR data. Accuracy LiDAR point cloud used to generate DEM was ±0.3m @ 95% CI. The coverage of this dataset is over the Sydney region. The C3 LAS data set contains point data in LAS 1.2 format sourced from a LiDAR (Light Detection and Ranging) from an ALS50ii (Airborne Laser Scanner) sensor. The processed data has been manually edited to achieve ICSM classification level 3 whereby the ground class contains minimal non-ground points such as vegetation, water, bridges, temporary features, jetties etc. This data has an accuracy of 0.3m (95% Confidence Interval) vertical and 0.8m (95% Confidence Interval) horizontal with a minimum point density of 1.03 laser pulse per square metre. For more information on the data accuracy, refer to the lineage provided in the data history.

Lineage Process Step

3D Strata was created with the utilisation of multiple internal spatial datasets. 3D spatial lot and common property lot heights and volumes are suggestive only.

The following methodology was utilised for the dimensioning of the digitalised strata plans for 3D visualisation purposes.

Surveyor strata plan images do not contain comprehensive height, elevation or survey accurate positioning of the building features within a parcel of land. Strata plan floor levels are distributed within the building footprint and maximum eave height or flat roof form height of the building forms, allowing for spatial units to extruded vertically up to the roof height of the building shell.  StratumLevel_maximum = max (StratumLevel). CeilingHeight = (Height_MAX)⁄((StratumLevel_maximum+1) )

The following methodology was used to create a floor elevation height for each lot and part lot of the strata scheme units. Elevation may represent 3D Building elevation or 1 and 5 metre DEM elevation. FloorEaveHeight = Elevation+(CeilingHeight × StratumLevel). For all strata plans that do not have corresponding 3D building height data a process of spatial unit floor to ceiling heights was determined through an estimation based on residential height regulations. In the case of the production of the heights for the estimated and generic height spatial units, all lots and common property units were classed as “Habitable”. "Habitable” gives reference to the minimum and maximum heights for floor to ceiling measurements outlined in Building Code of Australia (BCA). With a minimum height of 2.4 and maximum height of 3 metre ceilings, a determined height of 2.8 metres was used to represent the height of individual spatial units with reference to strata floor level data. 

The following methodology was used to create a ceiling extrusion height for each lot and part lot of the strata scheme units. CeilingHeight = 2.8 (metres). The following methodology was used to create a floor elevation height for each lot and part lot of the strata scheme units. Elevation represents 1 or 5 metre DEM elevation values. FloorEaveHeight = Elevation+(CeilingHeight × StratumLevel)

Metadata

Type	Hosted Feature Layer
Update Frequency	As Required
Contact Details	Contact us via the Spatial Services Customer Hub
Relationship to Themes and Datasets	NSW Land Parcel and Property Theme of the Foundation Spatial Data Framework
Accuracy	The dataset maintains a positional relationship to, and alignment with, the Lot and Property digital datasets. The Lot and Property data was captured by digitising the best available cadastral mapping at a variety of scales and accuracies, ranging from 1:500 to 1:250 000 according to the National Mapping Council of Australia, Standards of Map Accuracy (1975). Therefore, the position of the feature instance will be within 0.5mm at map scale for 90% of the well-defined points. That is, 1:500 = 0.25m, 1:2000 = 1m, 1:4000 = 2m, 1:25000 = 12.5m, 1:50000 = 25m and 1:100000 = 50m. A program of positional upgrade (accuracy improvement) is currently underway.
Standards and Specifications	Open Geospatial Consortium (OGC) implemented and compatible for consumption by common GIS platforms. Available as either cache or non-cache, depending on client use or requirement.
Aggregators	Spatial Services \| Department of Customer Services
Distributors	Spatial Services \| Department of Customer Services
Dataset Producers and Contributors	Spatial Services \| Department of Customer Services
Co-ordinate System	GDA94/MGA zone 56 EPSG: 28356
Datum	GDA 1994
Spatial Extent	West        150.014678    East          151.135712 North       -32.996069     South       -34.337416