Outer Hebrides Lidar Digital Terrain Model for Flood Risk Modeling, 2019

A 2019 lidar survey covering approximately 1705 km² of the Outer Hebrides, commissioned by the Scottish Environment Protection Agency (SEPA) and flown by Bluesky International Ltd. The point cloud data was captured at 4 points per square metre and processed using the OSGM15 geoid model and OSTN15 transformation. This dataset reflects the resulting 50 cm resolution Digital Terrain Model (DTM).

Use Cases

• Modeling coastal and surface water flood risk based on the high-resolution topographic data mentioned in the description.
• Conducting terrain analysis for environmental planning based on the 50 cm DTM.
• Validating and improving other topographic datasets based on the ground control areas with reported RMSE values.
• Supporting coastal erosion studies based on the detailed elevation data of the Outer Hebrides.

Strengths

• Covers approximately 1705 km², providing a substantial spatial footprint.
• High-resolution data captured at 4 points per square metre and processed to a 50 cm DTM.
• Includes 11 ground control areas with reported RMSE values from 0.020m to 0.097m, suggesting a measure of accuracy validation.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.

Provenance

Source

Scottish Environment Protection Agency (SEPA), collected by Bluesky International Ltd.

Collection Method

Aerial lidar survey.

Time Range

2019

Freshness

Data collection occurred between June and September 2019.

Geography

Outer Hebrides, Scotland