Title

Vicmap Transport - Road Infrastructure Point 

Alternate title

TR_ROAD_INFRASTRUCTURE 

Purpose

Vicmap Transport provides an accurate representation of the Transport network across Victoria, at a capture scale ranging from 1:2,500 to 1:25,000. It is used in a variety of applications, particularly in emergency services, natural resource management, planning and development, and digital map publications. Data made available to Vicmap under Cross Border agreements is subject to the maintenance regime of the relevant jurisdiction and is not subject to the same maintenance regime of the Vicmap datasets. Cross border data made available in Vicmap is not updated regularly and was last updated in: - NSW in 2017. - South Australia in 2020. 

Supplemental Information

Related Documents: None www.delwp.vic.gov.au/vicmap 

Status

Completed  

Horizontal Accuracy

25m  

Code

4283 

Maintenance and update frequency

Irregular  

Topic category

• Structure
• Transportation

Use limitation

. 

Classification

Unclassified  

Statement

Dataset Source: The line work and points were derived from the Vicmap Digital Topographic (VDT) map base coordinated by LIG. Road network was updated using aerial photography and setellite imagery. In built up areas such as large rural townships the road centreline derived from VicMap Digital Property was used. Dataset Originality: Derived 

Description

Collection Method: Conversion of existing mapping, digital stereo capture 

Description

- Conversion of existing mapping - compilation conversion 30% and repromat conversion 50% - digital stereo capture - 20% -The majority of the conversion of existing mapping and approximately 30% of the digital stereo capture were outsourced to private contractors and the remainder was captured in house. Contractor's primarily scanned and vectorised existing repromat with a small amount of hand digitising done in some instances. 

Classification

Unclassified  

Attribute Quality

Comments

The allowable error in attribute accuracy ranges between a 1% allowable error to 5% error. For this product attribute accuracy ranges between a 1% to 5% error. For this product attribute accuracy is a measure of the degree to which features and attribute values of spatial objects agree with the information on the source material. 

Positional Accuracy

Comments

The planimetric accuracy attainable will be the sum of errors from thee sources: -the positional accuracy of the source material -errors due to the conversion process -errors due to the manipulation process The measure of accuracy given for 'Road Network - Vicmap Transport' data is the source scale of the mapping from which the digital data was initially derived. Source map scales, from 1: 2,500 to 1:25,000.It is not possible to guarantee the final planimetric accuracy of the 'Road Network - Vicmap Transport' other than estimate possible errors due to the positional accuracy of the source material and data conversion and manipulation processes.A conservative estimate of 5m and 20m for the standard deviation of the SDRN within the Melbourne Metropolitan area and Rural areas respectively will be used in any data quality information.Alternate and equal ways of expressing this error are:Not more than 10% of well defined points will be in error by more than 8.2m for the Melbourne Metropolitan area and 33m. for rural areas.The worst case error for the data is 15m for the Melbourne Metropolitan area and (60m for Rural areas). 

Conceptual Consistency

Comments

The allowable error in attribute accuracy ranges between 1% to 5% error. Logical consistency is a measure of the degree to which data complies with the technical specification. The test procedures are a mixture of scripts, microstation MGE program and on-screen visual checks. 

Missing Data

Comments

Complete 

Excess Data