Putting TSD on the map – spatially representing traffic speed deflectometer data. Grant Clarke, Downer


TSD data is now available for the majority of the State Highway network.  For many of us, there is a question of can we use this data?  And if so, how do we use it?  This presentation outlines a spatial approach on making the data available in a usable format for our asset management analysis and decision making processes.
Moving from technical data to mapping output can be a daunting task for an Asset Information team.  This is made easier with multidisciplinary input from Downer specialists and Asset Management practitioners.  Understanding the start and end points allowed the Asset Information team to move forward with confidence.
Transforming the TSD data into SNP values is computationally intensive with a number of data quality issues that need to be addressed.  Achieving processing efficiency is critical when calculating values for a whole network.  Trapping errors in various input and calculated values is essential to ensure output integrity.  Good mapping demands that the SNP values be summarised in appropriate granularity along with spatial referencing.  The final data step before mapping is to translate the SNP into strength categories.
Mapping output is added to Google Maps which is shared with our Asset Managers.  This can be used by itself or combined with layers from other datasets.  For example, combining the TSD with the Forward Work Programme gives a cross check on treatment selection.  The mapping output has been used to assess network health against HCV growth and the quick assessment of network pavement condition on new networks.

Grant Clarke is a Senior Asset Information Manager with Downer NZ, based in Christchurch since 2013.  He is actively engaged in NZTA Network Outcomes Contracts as well as providing asset information management support to local authority road maintenance contracts.  One focus area for Grant is supporting the Downer asset management practitioners with network wide data analysis including mapping the resultant information.