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Global Change Master Directory (GCMD)
Australian Land Cover Change data 1990-1995
Entry ID: BRS_ALCC_1990-95


Summary
Abstract: One hundred and fifty eight Landsat Thematic Mapper scenes for 1990
(1991 in the Australian Capital Territory, New South Wales and
Queensland) and 1995 were used in conjunction with vegetation and a
range of ancillary data sets by State agencies and BRS to establish:

?the extent of woody vegetation (native and exotic vegetation
greater than or equal to two metres tall with greater than or equal
to 20 percent crown cover) in Australia’s more intensively used
agricultural areas in 1990/91;

?the rates of clearing of this woody vegetation and tree planting
1990/91-1995, and the reasons for clearing and planting; and

?the types and biomass of vegetation cleared.

Remote sensing has provided a spatially accurate and reliable estimate
of the rates of clearing 1990-1995 for the Northern Territory, South
Australia, Tasmania, Victoria and Western Australia and for 1991-1995
for the Australian Capital Territory, New South Wales and
Queensland. This information has enabled the revision of preliminary
estimates of annual rates of clearing for woody vegetation for the
early 1990s from around 517,800 ha to 308,000 ha.

The results show that in 1990/91, 38 percent of the study area was
still covered by woody vegetation. Comparison with Carnahan’s
Natural Vegetation (1780s) data set indicates that around 70 percent
of the study area was covered by woody vegetation at the time of
European settlement; almost half of this woody vegetation (92.5
million ha) has been cleared since this time. This estimate does not
include the clearing of grasslands, heathlands and sparse woodlands.

Analysis of the satellite data showed that about 1,212,620 ha were
cleared for agriculture (cropping), grazing and other activities,
principally urban and infrastructure development over the study
period. Clearing for grazing accounted for more than 50 percent of the
total land cover change and 77 percent of the clearing which
contributes to greenhouse gas emissions in the land use change sector
of the National Greenhouse Gas Inventory. This clearing of 1,212,620
ha of native woody vegetation reduced the 1990/91 area of native woody
vegetation cover by 1.1 percent. Annual rates of decrease and
increase in woody vegetation were calculated using results from the
satellite data for use in the National Greenhouse Gas
Inventory. Estimated annual rates of decrease in woody vegetation for
the continent due to clearing for agriculture and grazing total
292,030 ha. Clearing for development of roads and urban infrastructure
added another 16,100 ha.

Increases in woody vegetation (excluding that due to regeneration
following fire and native forest harvesting) totalled 414,010 ha in
the study period. Comparison of the estimated annual rates of loss of
woody vegetation through clearing for agriculture, grazing and
cropping and increases due to on-farm tree planting and plantation
establishment show there was a net loss of native woody vegetation
over the period 1990/91-1995.

For the study area as a whole, Woodland (M2 — 47 percent), Low
woodland (L2 — 28 percent) Open forest (M3 — 16 percent)
and Tall shrubland (S2 — 7 percent were the major types of
native woody vegetation cleared for agriculture, grazing and
development 1990/91 - 1995.

Estimated annual losses of aboveground biomass for the study area due
to clearing for agriculture, grazing and development total 18.5
million tonnes of dry matter. Most of these losses were due to
clearing in Queensland (88 percent). Clearing in New South Wales
contributed seven percent, while clearing in Western Australia
contributed three percent. Other States contributed one percent or
less each.

All areas of land cover change identified through analysis of the
satellite data have been checked extensively by State agencies against
aerial photography, other satellite or ancillary thematic data or
through field work.

An assessment of the land cover change results has been undertaken by
independent consultants. It demonstrated that there were no
significant differences between the States' results and those obtained
by the consultants undertaking the assessment. A comparative analysis
of the States' and consultant's results at the continental, State and
scene levels showed that although the States used different image
analysis approaches, their mapping of land cover change was very
consistent.

The four datasets available as ARC/INFO Grids in Albers Equal Area
projection, namely:

Land cover 1990/91 (LCT_90/LCT_91)
Land cover change 1990/9-1995 (CHANGE) including TYPE
and CAUSE of change
Land cover 1995 (LCT_95)
Structural and floristic vegetation 1990 (SV_90)
including dominant SPECIES, Growth Form and CARNAHAN
structural code

The original 25m pixels have been resampled to 100m and 250m as State
and national datasets respectively.

The data are available on CD-ROM and from the Australian Natural
Resources Data Library (&http://adl.brs.gov.au/anrdl/php/&).

Documents and reports are also available for download in PDF format
from the Greenhouse Sciences Web page under
&http://www.daff.gov.au/brs/land&

Geographic Coverage
 N: -9.995 S: -44.005  E: 154.005  W: 112.505

Data Set Citation
Dataset Creator: Barson, M.B., Randall, L.A. and Bordas, V.M.
Dataset Title: Australian Land Cover Change 1990-1995
Dataset Release Date: 2000-01-01T00:00:00.000Z
Dataset Release Place: Canberra, Australia
Dataset Publisher: Bureau of Rural Sciences, Australia
Version: Not provided


Temporal Coverage
Start Date: 1990-04-01
Stop Date: 1996-02-01


Location Keywords
CONTINENT > AUSTRALIA/NEW ZEALAND > AUSTRALIA


Science Keywords
BIOSPHERE >VEGETATION >VEGETATION COVER    [Definition]
BIOSPHERE >VEGETATION >VEGETATION SPECIES    [Definition]
HUMAN DIMENSIONS >BOUNDARIES >ADMINISTRATIVE DIVISIONS    [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL GOVERNANCE/MANAGEMENT >LAND MANAGEMENT >LAND USE CLASSES    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER    [Definition]
LAND SURFACE >LAND USE/LAND COVER >LAND USE/LAND COVER CLASSIFICATION    [Definition]
LAND SURFACE >LAND USE/LAND COVER >LAND USE CLASSES    [Definition]


Platform
LANDSAT-5    [Information]


Instrument
TM >Thematic Mapper    [Information]


Quality
Lineage:

Source data history: Land cover themes 1990 is based on Landsat
Thematic Mapper data captured in 1990 and classified crop/pasture,
urban, bare, water, plantation, orchards, native woody vegetation and
unknown. The satellite data was resampled to 25m pixels and the
classified data was supplied by 1:100,000 mapsheets. State agencies
used a variety of image processing steps to classify the data
including unsupervised and supervised classification.

Intermediate processing steps: 1:100,000 mapsheet datasets were merged
to form Statewide coverages and resampled to 100m pixels.

Positional Accuracy: original data 12.5m

Attribute Accuracy: Land cover and land cover change areas were
checked by each State, using ancillary and/or field data

Logical Consistency: Attributes were tested as part of the quality
assurance

Completeness: The data is spatially complete with the exception of
Victoria data outside the Murray-Darling basin, which is only
attributed to woody or non-woody. Data for the Ord irrigation scheme
has not been field-checked.


Access Constraints
No constraints


Data Set Progress
COMPLETE


Data Center
Bureau of Rural Sciences, Department of Agriculture, Fisheries and Forestry, Australia    [Information]
Data Center URL: http://www.brs.gov.au

Data Center Personnel
Name: LUCY ANNA RANDALL
Phone: +61-2-6272-4901
Fax: +61-2-6272-5827
Email: Lucy.Randall at brs.gov.au
Contact Address:
Bureau of Rural Sciences
PO Box E11
City: KINGSTON
Province or State: ACT
Postal Code: 2604
Country: AUSTRALIA



Distribution
Distribution_Media: FTP, CD-ROM
Distribution_Size: 264.0 MB
Distribution_Format: Arc/Info grids


Personnel
LUCY ANNA RANDALL
Role: METADATA AUTHOR
Phone: +61-2-6272-4901
Fax: +61-2-6272-5827
Email: Lucy.Randall at brs.gov.au
Contact Address:
Bureau of Rural Sciences
PO Box E11
City: KINGSTON
Province or State: ACT
Postal Code: 2604
Country: AUSTRALIA


MICHELE BARSON
Role: INVESTIGATOR
Phone: +61-2-6272-4347
Fax: +61-2-6272-5827
Email: Michele.Barson at brs.gov.au
Contact Address:
Bureau of Rural Sciences
PO Box E11
City: Kingston
Postal Code: ACT 2604
Country: Australia


LUCY ANNA RANDALL
Role: TECHNICAL CONTACT
Phone: +61-2-6272-4901
Fax: +61-2-6272-5827
Email: Lucy.Randall at brs.gov.au
Contact Address:
Bureau of Rural Sciences
PO Box E11
City: KINGSTON
Province or State: ACT
Postal Code: 2604
Country: AUSTRALIA


VIVIENNE BORDAS
Role: TECHNICAL CONTACT
Phone: +61-2-6272-4269
Fax: +61-2-6272-5827
Email: Vivienne.Bordas at brs.gov.au
Contact Address:
Bureau of Rural Sciences
PO Box E11
City: Kingston
Postal Code: ACT 2604
Country: Australia


Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 2002-05-29
Last DIF Revision Date: 2019-03-20



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