Title

Modelled old-growth forest in East Gippsland 

Alternate title

MOG2005_EG 

Purpose

MOG200_EG is a layer designed to store the major modelled output of old-growth forest studies for East Gippsland. 

Credit

Original OG100 data generated by: Adam Gilbee, Bill Peel & Steve Farrell, Natural Resource Systems Steve Farrell & Milos Pelikan Spatial Vision, Numerous NRE staff contributed to the project. MOG2003 -David Adams, Forest Resource Inventory , DSE , 2003 

Supplemental Information

History: Original Old-growth forest projects undertaken during 1990-97, generating an output file called OG100, defining modelled old-growth forest across RFA areas in Victoria. As a result of updated disturbance data inlcuding updated and modified logging history data, and also the Jan-Feb 2003 Alpine Fire Severity mapping classification (FIRESEV03), the impact on old-growth was identified as an issue. MOG2003 is derived from OG100 overlayed with updated logging information and fire severity classes. The fire severity class 1 (crown burn) impacts on all forest types, whereas class 2 (severe crown scorch) impacts on ash forest types only. So old-growth forest in these classes was seen to be removed from the old-growth class, as was modelled old-growth with clearfell harvesting history. Relationship to other Datasets: The old growth forest modelling process used to derive this layer uses key disturbance datasets, including SFRI25VE, 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. 

Status

Planned  

Horizontal Accuracy

100m  

Code

28355 

Maintenance and update frequency

Not planned  

Title

DIGITAL Arc/Info Revision 8 Librarian layer 1 

Topic category

• Biota

Use limitation

Access Subject to Custodian Approval Access Subject to Custodian Approval Access Subject to Custodian Approval 

Classification

Unclassified  

Statement

Dataset Source: Old Growth Forest modelling process for old-growth forest East Gippsland. Areas shown in logging history up to June 2005 and Fire history to June2005. Dataset Originality: Derived 

Description

Collection Method: GIS Modelling / Analysis 

Description

Refer to Old Growth Forest analysis project reports 

Classification

Unclassified  

Attribute Quality

Comments

A preliminary estimate of attribute accuracy would be: 90% for polygons GT 10 hectares 75% for polygons LT 10 hectares 

Positional Accuracy

Comments

Precision: +/- 200 m Determination: Deductive estimate based on 30m grid cell size used and precision of historic disturbance datasets used. 

Conceptual Consistency

Comments

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. Fire Severity Mapping and Logging history records that conflict with Old-Growth Forest (OG100) have been reclassified as not old-growth forest. 

Missing Data

Comments

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 East Gippsland. Completeness Verification: Individual Modelled Old-Growth Forest areas have not been verified in the field. 

Excess Data

Comments

.