Darwin Harbour Seabed Gravel Content Predictions at 10-Meter Resolution

Darwin and Bynoe Harbour regions in northern Australia have predicted seabed gravel content derived from a compilation of surveys conducted between 2011 and 2017. The dataset provides spatially continuous predictions in 10-meter resolution raster grids, based on 395 samples and 14 environmental variables from multibeam sonar data. This program was funded by the INPEX-led Ichthys LNG Project and involved the Northern Territory Government, Geoscience Australia, and the Australian Institute of Marine Science.

Use Cases

• Modeling marine habitat suitability based on predicted seabed gravel content.
• Informing dredging or coastal development decisions using spatially continuous sediment predictions.
• Assessing changes in seabed composition over time by comparing with future survey data.
• Calibrating broader regional sediment models using the high-accuracy predictions (VEcv = 59%).

Strengths

• Predictions are based on 395 physical samples, providing a ground-truthed foundation.
• Uses 14 environmental variables derived from high-resolution multibeam sonar bathymetry and backscatter.
• Demonstrates a 68.4% improvement in predictive accuracy for gravel compared to a commonly used method (IDW).
• Data is provided at a high 10-meter spatial resolution.

Limitations

• Absences in predictions occur due to non-availability of associated predictive variables.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for some analytical methods.

Provenance

Source

Compilation of surveys by Geoscience Australia (GA), the Australian Institute of Marine Science (AIMS), and the Northern Territory Government's Department of Environment and Natural Resources (NTG-DENR).

Collection Method

Predictions derived from a compilation of multiple seabed surveys conducted between 2011 and 2017.

Time Range

Survey data collected between 2011 and 2017.

Freshness

Last updated 2026-06-16 19:30:48.811844; freshness should be verified.

Geography

Greater Darwin Harbour and Bynoe Harbour region, northern Australian marine margin.