Title

Stock layer for calendar year 2016 

Alternate title

HDD_STOCK2016 

Purpose

This annual stock dataset is one of two components of the housing development data suite (with the other being annual housing project layers) that is an essential information resource for State Government housing and land monitoring functions. The data has been collected annually since 2004. 

Supplemental Information

Related Documents: None 

Status

Completed  

Code

4283 

Maintenance and update frequency

Biannually  

Topic category

• Planning cadastre
• Structure

Use limitation

. State Government of Victoria 

Classification

Unclassified  

Statement

Dataset Source: Polygon boundaries and addresses are sourced from the relevant Vicmap Property and Vicmap Address datasets for the particular time period. Colour aerial photography from DELWP for the period December to March has generally been used as the basis for identifying housing development activity. The Urban Development Program (UDP) dataset prepared and maintained by DELWP - Planning Division, and Vicmap Address, has been used to identify and assign attributes to multi-unit development projects. Dataset Originality: Primary 

Classification

Unclassified  

Attribute Quality

Comments

The accuracy of attributes will vary based on the type of attribute. They will also vary based on the data of the source information on which they are based. Address and lot size information from Vicmap will be at the allowable error in attribute accuracy for this datasets that ranges between a 1% (for new data additions) to 5% (for pre-maintenance contract data). Housing stock related attributes are estimated to be in this same range of between 1% to 5% based on the processes used to capture these attributes, the source materials used, and consistency attribute tests with the housing project datasets. 

Positional Accuracy

Comments

Positional accuracy is consistent with that of the Vicmap Property dataset on which it is based, which is classified as "BB" accuracy. That is, 90% of well-defined features are within 1mm (at plot scale) of their true position, eg 1:500 equates to +/- 0.5metre and 1:25,000 equates to +/- 25 metres. 

Conceptual Consistency

Comments

Logical data consistency tests were undertaken based on the known relationship between dataset attributes, and on the relationship between Stock and Project layers within the same year and across different years. For example, only a vacant lot can have a dwelling under construction. And similarly, the number of constructed dwellings for a housing project in the Project layer for a given year, should equal the total stock in the Stock layer for the same geographic extent, although there are some inconsistencies after 2012. 

Missing Data

Comments

The data is complete for the Melbourne metropolitan area which is defined in terms of Local Government Areas (LGA), as defined by clause 72 of the Victorian Planning Provisions. 

Excess Data