Vegetation Trend Analysis For South West Agricultural Zone 2012-2022

Landgate's Vegetation Trend product provides statistical summaries of vegetation density change derived from Landsat imagery. It covers two time periods, 1990-current and the last 10 years, specifically for the south west agricultural zone of Western Australia. The data includes measures like mean, linear trend, quadratic trend, and standard deviation to analyze vegetation stability and patterns.

Use Cases

• Model linear and quadratic trends over time to identify long-term vegetation decline or recovery in the agricultural zone.
• Analyze the residual standard deviation after fitting trends to quantify the stability of vegetation density.
• Map the mean Land Monitor vegetation index to assess baseline vegetation density across the region.
• Compare statistical summaries from the 1990-current period against the last 10 years to detect shifts in change patterns.

Strengths

• Provides analysis for two distinct time periods: a long-term series from 1990 and a focused recent decade.
• Derived from the established Land Monitor Landsat-based vegetation index methodology.
• Includes multiple statistical measures (mean, trend, standard deviation) for a nuanced analysis of change.

Limitations

• Geographic scope is limited to the south west agricultural zone only, not statewide or national.
• Data is delivered as image files and web services, requiring GIS expertise for access and analysis.

Provenance

Source

Landgate, the Western Australian land information authority.

Collection Method

Calculated from Landsat satellite imagery using the Land Monitor vegetation index (red band + short wave infrared band 1).

Time Range

1990 to current year, with a focus period of the last 10 years.

Freshness

Updated to current year, with last update recorded in March 2026.

Geography

South west agricultural zone of Western Australia.