In the November 2023 release of P2R Projector two new project types (Gully and Streambank) were developed. These project types are adapted from the Gully and Streambank Toolbox methods, developed for Reef Trust by CSIRO, The Australian National University, Griffith University and the Queensland Department of Agriculture and Fisheries, for calculating sediment savings from erosion control activities. For more detailed information on the application of these methods, see the Gully and Streambank Toolbox Technical Guide.
CSIRO as part of their technical support for the Australian Government Landscape Repair Program have developed a technical guidance document, whilst aimed at groups delivering projects under the Landscape Repair Program it is a valuable source of information for anyone delivering a gully or streambank repair project.
Gully and Streambank project explanatory notes on this page:
Gully and Streambank Toolbox automatic data retrieval
November 2023 release
To support the use of P2R Projector Gully and Streambank Toolbox for ‘prospecting’ projects, some required data values are retrieved from publicly available API sources to i) prevent calculations from failing and ii) provide initial erosion estimates that are representative of expected values. These surrogate data values are provided as a convenience and can be overridden with locally derived data in all cases when a greater focus on accuracy and comparability are required.
Climate Correction Metrics
Metrics of long term and recent period daily rainfall averages are source from the SILO Data Drill API, using a point (latitude, longitude) that is calculated as the geometric centre of the geometric feature. The Climate Correction Factor is the Long Term Daily Rainfall Average divided by the Recent Period Daily Rainfall Average.
Soil Order
A representative Australian Soil Order is estimated using the Modelled Australian Soil Classification Map WMS Service.
Trials querying the WMS by polygon and polygon and polyline features revealed that the ArcGIS REST Service ultimately performed a point-based query using a geometric centre. Until that behaviour is changed, the Toolbox API call will use a simple point (latitude, longitude) that is calculated as the geometric centre of the geometric feature. The Soil Order returned is mapped from the numeric according to its numeric pixel value.
| Numeric pixel value | Soil order |
|---|---|
| 1 | Vertosol |
| 2 | Sodosol |
| 3 | Dermosol |
| 4 | Chromosol |
| 5 | Ferrosol |
| 6 | Kurosol |
| 7 | Tenosol |
| 8 | Kandosol |
| 9 | Hydrosol |
| 10 | Podosol |
| 11 | Rudosol |
| 12 | Calcarosol |
| 13 | Organosol |
| 14 | Anthroposol |
Soil Parameters
Soil parameter values for Silt, Clay, Bulk Density, Total Nitrogen and Total Phosphorus are retrieved from the data layers made available as the Soil and Landscape Grid Of Australia. The layers are queried using the geometric centre of the geometric feature, calling the ‘extractSLGAdata’ service provided by the API. Data values from the soil layer with upper depth 30cm and lower depth 60cm are used to provide surrogate data values.
