Ash Tree Distribution Maps Across Great Britain from 2007 Survey

Mean estimate distribution maps of ash trees (Fraxinus excelsior) across Great Britain. The data covers ash trees in areas less than half a hectare, ash trees in woody linear features, and individual ash trees. It was derived from the Countryside Survey 2007, mapping trees in 569 stratified random 1km sample squares across Britain.

Use Cases

• Modeling ash tree population density across Great Britain based on the stratified random sampling.
• Analyzing the distribution of ash trees in linear features like hedgerows based on the described data categories.
• Creating baseline maps for ash tree health and conservation studies using the 2007 survey estimates.
• Scaling up local tree survey data to national estimates using the described statistical method.

Strengths

• Data is based on a systematic survey of 569 1km sample squares across Britain.
• Includes multiple categories of ash tree presence: small areas, linear features, and individual trees.
• Mean national estimates were produced using a scaling methodology from the sample data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data is from a single survey year (2007), which may not reflect current conditions.
• Row count and exact spatial resolution are unknown, which may limit suitability assessment.

Provenance

Source

Environmental Information Data Centre

Collection Method

Trees were mapped using a stratified random sampling system based on the ITE Land Classification.

Time Range

2007

Freshness

Last updated 2026-07-02 19:11:20.240082; freshness should be verified.

Geography

Great Britain