Vegetation Trend Analysis for Southwest Australia 1990-2022

Vegetation Trend product provides multiband image files summarizing changes in vegetation reflectance over time using the Land Monitor Landsat-based vegetation index. The data covers two time periods, 1990-current year and the last 10 years, specifically for the southwest agricultural zone, and includes statistical measures like mean, linear trend, and quadratic trend.

Use Cases

• Analyze linear trend and quadratic trend over time to model long-term vegetation density changes in the southwest agricultural zone.
• Map areas of significant vegetation change by comparing residual standard deviation after fitting linear trend across the two provided time periods.
• Assess vegetation stability using the standard deviation about mean and Land Monitor vegetation index values.
• Highlight regions with different patterns of change by visualizing statistical summaries like mean reflectance and residual standard deviation after fitting linear and quadratic trends together.

Strengths

• Covers a 32-year time range from 1990 to 2022 for long-term trend analysis.
• Provides two distinct analytical time periods: the full 1990-current span and the last 10 years.
• Includes multiple statistical measures per location: mean, linear trend, quadratic trend, and several standard deviation metrics.

Limitations

• Spatial coverage is limited to the southwest agricultural zone only, not statewide or national.
• Data is derived from a specific vegetation index (Land Monitor) which may not capture all vegetation characteristics.
• Available as image files and web services, which may require GIS expertise for analysis compared to tabular data.

Provenance

Source

Landgate, the Western Australian land information authority.

Collection Method

Calculated from Landsat satellite imagery using the Land Monitor vegetation index related to vegetation density.

Time Range

1990 to current year (2022 as referenced), with a secondary period covering the last 10 years.

Freshness

Updated to the current year as of the last update in March 2026.

Geography

Southwest agricultural zone of Western Australia.