Contacts

Identifiers and Keywords

ANZLIC Id

ANZVI0803001075 

Victorian Spatial Data Library (VSDL) Schema

FORESTS:TREE100 

Jurisdiction

Victoria 

Topic category

• Biota
• Farming

Resource Constraints

Classification

Unclassified  

Creative Commons Attribution 4.0 (CC-BY)

• 
• License Text

Other Dataset Details

Date ( Revision )

2016-05-06

Date ( Publication )

2018-02-02T14:10:59

Status

Completed  

Purpose

To be used as a base cover of permanent tree cover for most purposes. Areas of temporary change have been removed. This layer depicts polygons showing tree cover as defined by woody vegetation greater than 2 metres in height and with a crown cover (foliar density) greater than 10%. Tree cover is mapped down to a minimum area of one hectare. This layer was derived from LANDSAT TM digital data. 

Credit

Adam Gilbee, John White, Luong Tran. 

Supplemental Information

History: This layer replaces the TREE100_9093 dataset that was removed from the Corporate Geospatial Library in November 1995. It also supersedes the TREE100_90 dataset which was dropped on 7 June 1996. Relationship to other Datasets: There will be a layer that depicts tree cover change. Current Design Issues: The layer was created to give an accurate assessment of tree cover extent for the state of Victoria and to provide a baseline dataset for further projects based around tree cover. This layer shows the presence or absence of trees only. Future Design Issues: There will be a layer developed that shows tree cover change. This layer may be used as a base for future tree cover mapping in 1995. Related Documents: None Tree cover change in Victoria c.1869-1993. "An outline of methods for mapping and monitoring", Adam Gilbee, NRE (1999). 

Maintenance and update frequency

Unknown  

Maintenance date ( Publication )

2018-02-02T14:10:59

Spatial

Spatial representation type

Vector  

Description

General - Victoria 

Reference system identifier

4283

N

S

E

W

Temporal

Begin date

1989-12-01 

End date

1993-04-30 

Resolution

Horizontal Accuracy

100m  

Quality

Conceptual Consistency

Not relevant 

Missing Data

Complete for Victoria Complete for Victoria 

Attribute Quality

A random sampling technique was applied to each mapsheet of the 1990 dataset to assess reliability. Reliability varied from 81% to 89% averaging 84.5% across Victoria. The 1993 dataset highlighted errors in the 1990 dataset which were corrected resulting in a much improved accuracy over that initially sampled. 

Positional Accuracy

Precision: 10 m to 100 m Determination: GPS and statistical analysis. 

Lineage

Description

Digital (unsupervised) classification to produce 100 classes per LANDSAT TM scene carried out on ER Mapper. One hundred classes were assigned as having tree cover present or absent for each year. Tree cover classifications for each year were overlayed in GRID and a change dataset produced. Areas of change were checked and edited using aerial photography, local knowledge, existing maps, GIS analysis and field checking to produce areas of permanent and temporary change. The tree covered area includes areas of tree cover in both 1990 and 1993 plus areas of 1993 regrowth plus areas not tree covered due to temporary changes. 

Statement

Dataset Source: Data was originally sourced from LANDSAT TM5 satellite images from Summer 1990 and 1993. Dataset Originality: Primary 

Attributes

Column Name	Obligation	Unique	Data Type	Data Length	Data Precision	Data Scale	Reference Table Owner	Reference Table Name	Reference Table Code Column Name	Short Column Name	Definition
X_TREEDESC	O	N	VARCHAR2	20						X_TREEDESC
HECTARES	O	N	NUMBER	22	18	2				HECTARES
TREE100_SRC	O	N	NUMBER	22	4	0				TREE100SRC
AREASQM	O	N	NUMBER	22	18	2				AREASQM
X_TREESRC	O	N	VARCHAR2	50						X_TREESRC
TREE	O	N	VARCHAR2	1						TREE

About the Metadata Record

Metadata identifier

urn:uuid / 1490d477-0c6f-5e30-910b-4032eaf9895a