Vicmap Lite - Road Line - 1:250,000 to 1:5,000,000

dataset: VMLITE_TR_ROAD
This layer is part of Vicmap Lite and contains line features representing the road network. Vicmap Lite datasets are suited for use between scales of 1: 250,000 and 1 : 5 million. The linework was sourced from Vicmap Transport. The level of attribute information, the number of features and the number of vertices has been simplified to suit the 1: 250,000 - 1 : 5 million scale range. The concept of a Scale Use Code has been introduced to help control the level of detail displayed. Search:- roads, road, track, highway, transport. THIS DATASET WAS LAST UPDATED IN DECEMBER 2015
 
Citation proposal Citation proposal

(2022)

Vicmap Lite - Road Line - 1:250,000 to 1:5,000,000

Department of Transport and Planning

Description

Title
Vicmap Lite - Road Line - 1:250,000 to 1:5,000,000 
Alternate title
VMLITE_TR_ROAD 
Purpose
THIS DATASET WAS LAST UPDATED IN FEBRUARY 2022 
Supplemental Information
Current Design Issues: Incorporating declared road names as the primary name. Selecting one lane of freeway to depict it. Related Documents: None https://www.land.vic.gov.au/maps-and-spatial/spatial-data/vicmap-catalogue 
Status
Completed 
 
 

Spatial

Horizontal Accuracy
25m 
Code
4283 
 
 

Maintenance

Maintenance and update frequency
As needed 
 
 

Contacts

  Point of contact

Cited responsible party

No information provided.

Cited responsible party

No information provided.

Cited responsible party

No information provided.
 
 

Keywords

Topic category
  • Transportation
 
 

Constraints

Use limitation
How to access spatial data https://www.land.vic.gov.au/maps-and-spatial/spatial-data/how-to-access-spatial-data/licensing or DataVic www.data.vic.gov.au For enquires relating to this product: vicmap.help@transport.vic.gov.au 
Classification
Unclassified 
Creative Commons Attribution 4.0 (CC-BY)
 
 

Lineage

Statement
Dataset Source: Vicmap transport (TR_ROAD) Dataset Originality: Derived 
Description
Collection Method: Derived from source 
Description
GENERAL Level of detail reduced to suit 1:250,000 - 1:5 million scale range. Redundant attributes removed, Scale Use Code attribute added and populated. Number of verticies reduced using an enhanced Douglas and Peucker simplification algorithm. DETAIL Automatic selection of road class 0-3 Delete majority small Freeaway ramps Onscreen selection of significant 4-7 class roads, or misclassified segments for completness and visual correctness as per selection process description below; The filtered roads were overlaid over the full TR_Roads dataset to find inconsistencies and gaps that might have arisen. The location dataset, built up area as well as PLM 100 was added to give context to the roads layer. The state was then manually scanned to fill gaps with roads of class 4-7 where; " There was a major road or track through a remote State Forest or National Park ie Murraville South Road which is the only road within 130km that connects the Western and Malee Highways. This was half the distance if one travelled along a major road. #1 Roads that connected small towns or Localities were added. These were the shortest link by far between the towns. #2 Gaps in existing class 0-3 were filled. These were likely candidates for reclassification #3 Roads that ended in the middle of nowhere were also looked at to see if they ended there indeed or there was a continuation at a lower class #4 The four freeways under construction (Eastlink etc) were also added to the layer #5 The whole layer was then checked by another operator for consistency and errors. A copy of the layer with the selected TR_ROADS was recently created as master containing all original attributes. This can be used as a basis for updating Vicmap Lite. Declared Roads need to take precedence over local roads. For example Ballarat Road in Deer Park needs to be called Western Highway. Attributing Vicmap Lite could be a complex process as there is no aspatial link in the data. DSE declared Public Roads will feature in this dataset. This is an opportunity to upgrade the classification of roads in State Forest Data segments are then combined to form one line string named Western Highway. Data is then weeded to obtain the generalised data set 
 
 

Metadata Constraints Metadata Constraints

Classification
Unclassified 
 
 

Quality

Attribute Quality
Comments
For the TR_ROADS product attribute accuracy ranges between a 1% to 5% error. For this product attribute accuracy will be better since, the vast majority of data is composed of the higher class, ie (highways instead of minor back roads). 
 
Positional Accuracy
Comments
The source line work was generalised using an enhanced Douglas and Peucker simplification algorithm. The algorithm keeps so-called critical points that depict the essential shape of a line and removes all other points. The algorithm connects the end nodes of an arc with a "trend line". The distance of each vertex to the trend line is measured perpendicularly. Vertices closer to the line than the tolerance are eliminated. A 30m tolerance was used on this dataset 
 
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 and on-screen visual checks. 
 
Missing Data
Comments
Statewide coverage complete for Victoria in the form of roads class 0-3. Other additional roads classes 4-9 have been selected for completness at the targeted scale of 1:250,000 
 
Excess Data
Comments
Complete as is from TR_ROAD. Revision of minor roads in forests. Feedback from Roads management Act work in form of declared roads by DSE. 
 
 
 

Overviews

Graphic Overview of Data Footprint


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