Monitoring the susceptibility of hundreds of km of the Gautrain network between Johannesburg and Pretoria to geohazards such as slope instability and sinkholes the traditional way was slow, expensive and subjective.

InSAR analysis and visualisation of the outputs over the whole network in GIS gave Gautrain a quicker, objective means of identifying problematic locations for further local investigation.

Highlights

• Monitoring the condition of the whole rail network was time-consuming and subjective.

• InSAR analysis provided historical and current displacements for the whole network.

• Outputs were presented on an accessible GIS platform of the railway corridor. 

• Problematic locations for further targeted investigation were identified easily and objectively.