This layer contains identified areas of modelled old-growth forest derived from both vector and grid based analysis. Areas delineated as old growth forest are identified to meet the Victorian definition of old-growth forest based on a set of modelling criteria, rules and input datasets. The data is not reliable at scales less than 1:100,000 (ie 1:25,000), not all old-growth polygons have been confirmed by field checking and the reliability of the modelled linework has not been verified.
Search Words:
Biota
Publication Date:
02 February 2018
Dataset Status:
Old Growth data from the East Gippsland, North East, Goldfields and Central Highlands studies have been completed. The Gippsland study area data will be available by January 1999.
Old-growth forest data from the East Gippsland, North East, Central Highlands, Gippsland, Portland-Wimmera and Otways-Midlands studies have been completed. Data from the Gippsland ,Portland-Wimmera and Otways-Midlands studies will be incorporated into the library in September/October 2000.
Progress:
Completed
Access Constraint:
Creative Commons Attribution 4.0 (CC-BY)
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License Text
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Access Subject to Custodian Approval
Access Subject to Custodian Approval
Access Subject to Custodian Approval
Data Existence:
Metadata Name
Descriptions
Resource Name:
OG100
Title:
Modelled old-growth forest boundaries.
Anzlic ID:
ANZVI0803002058
Custodian:
Owner:
Jurisdiction:
Victoria
Abstract:
This layer contains identified areas of modelled old-growth forest derived from both vector and grid based analysis. Areas delineated as old growth forest are identified to meet the Victorian definition of old-growth forest based on a set of modelling criteria, rules and input datasets. The data is not reliable at scales less than 1:100,000 (ie 1:25,000), not all old-growth polygons have been confirmed by field checking and the reliability of the modelled linework has not been verified.
Search Words:
Biota
Purpose:
OG100 is a layer designed to store the major modelled output of old-growth forest studies for Victoria. Modelled areas of old-growth forest are used as a major input into the preparation of Regional Forest Agreements and Forest Management Planning and associated analysis.
Geographic Extent Polygon:
Geographic Bounding Box:
Beginning to Ending Date:
1994-01-01 - 1999-01-01
Maintainence and Update Frequency:
Not planned
Stored Data Format:
Available Format(s) Types:
DIGITAL - All major formats available
Positional Accuracy:
Precision: +/- 200 m
Determination: Deductive estimate based on 30m grid cell size used and precision of historic disturbance datasets used.
Attribute Accuracy:
A preliminary estimate of attribute accuracy would be:
90% for polygons GT 10 hectares
75% for polygons LT 10 hectares
Logical Consistency:
The Old-growth forest modelling is based on a set of logic rules. All forest categories have therefore been determined consistently within each study area. Some logical anomalies may exist where the modeling has been unable to cope with exceptions to the logic rules. The data is not reliable at scales less than 1:100,000 (ie 1:25,000), not all old-growth polygons have been confirmed by field checking and the reliability of the modelled linework has not been verified.
Data Source:
Dataset Source: Old Growth Forest modelling process for each old-growth forest studies including ; East Gippsland, Central Highlands,North_East, Gippsland, Portland-Wimmera and Otway-Midlands.
Dataset Originality: Derived
Contact Organisation:
Contact Position:
Address:
Telephone:
Facsimile:
Email Address:
Metadata Date:
2023-03-27T11:39:39
2023-03-27T11:41:21
Additional Metadata:
Relationship to other Datasets: The old growth forest modelling process used to derive this layer uses key disturbance datasets, including GRAZE100, LOGHIST100, LOGHIST250, FIRE100_XY, AGCLEAR100 and mining layers, and vegetation attributes from the GSTAGE100, EVC100, SVEG100 layers.
Current Design Issues: The old-growth modelling process is undertaken on a study areas basis with which each study applying different rules and inputs. It is possible that adjacent study areas within one tile may have edge matching problems.
Future Design Issues: The current dataset does not assign an accuracy level to any polygon. This may need to be accomodated as areas of old-growth forest are increasingly verified in the field.
Related Documents: None
A Study of the Old-Growth Forest of East Gippsland, Woodgate et.al. 1994
Central Highlands Old-Growth Forest Project, Forests Service Technical Report 96-3
"Study of Old Growth Forest in Victorias Central Highlands", Forests Service Technical Report 96-3.
"Stand Class Definitions and Polygon Labelling Guidelines for the State Forest Resource Inventory". Peter Elliot, Department of Conservation and Natural Resources 1996
"Study of Old-growth Forest in Victoria's North-East", forest Service technical report 98-1.
"Old-growth Forest study of Gippsland Victora - Modelling of Old-growth Forrest Status". Study Report. Stephen Farrel & Milos Pelikan (Unpublished Report), 1999.
"Old-growth Forrest Study of South - Western Victoria: Portland Wimmera and Otways- Midlands - Modelling of Old-growth Forest status", Study Report. Stephen Farrell and Milos Pelikan (Unpublished Report), 1999.
https://www.delwp.vic.gov.au/__data/assets/pdf_file/0021/413094/3-Old-growth-forests-factsheet-FINAL.pdf