Fig. 1.
Fig. 1.

The extent of the Land Monitor project– the southwest agricultural region of Western Australia. Standard Landsat TM scene extents are shown.

 


Fig. 2.
Fig. 2.

The Soil Landscape Zones and the 11 training areas for the agricultural region of Western Australia.

 


Fig. 3.
Fig. 3.

Example of the fours areas of training data derived from Broomehill. The gray areas within the four training areas were considered by an expert hydrologist to have a lower salinity hazard on the basis of the current extent and forecast risk. Conversely, the white areas were considered to have a higher likelihood of becoming saline.

 


Fig. 4.
Fig. 4.

Six Soil Landscape Zones identified for independent analysis and salinity hazard model development.

 


Fig. 5.
Fig. 5.

Predicted hazard area for Broomehill using the decision tree model trained on another catchment located in a similar Soil Landscape Zone, 100 km northwest (Date Creek catchment).

 


Fig. 6.
Fig. 6.

Derived map of salinity hazard, with mapped salinity (Furby et al., 2009) overlaid, for the southwest agricultural region and (insert) for an approximately 16 km2 subregion showing the mapping detail (near Lake Magenta). Areas mapped as salt affected in 1988 are shown in orange. Areas that became salt affected by 1998 are shown in red. The salinity hazard areas are shown in blue. The greyscale background is a January 1994 Landsat TM mosaic image. The green square in the main display shows the location of the insert region.