Temperate Highland Peat Swamps on Sandstone (THPSS) vegetation maps. THPSS is a Threatened Ecological Community (TEC). Using a 25 m Digital Elevation Modal (DEM) coupled with orthorectified aerial photography, the THPSS of the Sydney Basin were mapped in ArcGIS. Only valley-bottom swamps were mapped. Hanging swamps or hillslope drapes were excluded. In ArcGIS, the physical attributes of the swamps were attributed and measured. This included swamp area, elevation above sea level, swamp slope, catchment area, swamp and catchment elongation ratio, swamp length and distance to coast. Further information on the enforceable undertaking and the terms of the THPSS Research Program can be found at www.environment.gov.au/news/2011/10/21/centennial-coal-fund-145-million-research-program. Attribution to: Macquarie University, K Fryirs & G Hose 2016, THPSS mapping layer. 6 maps showing the spatial distribution of THPSS were produced for the following areas: Blue Mountains - VIS_ID 4480 Budderoo - VIS_ID 4481 Gosford - VIS_ID 4482 Newnes - VIS_ID 4483 Woronora - VIS_ID 4484 Penrose - VIS_ID 4485