Topographic Position Index (3" resolution) derived from 1" SRTM DEM-S

Topographic Position Index (TPI) is a topographic position classification identifying upper, middle and lower parts of the landscape. This dataset includes a mask that identifies where topographic position cannot be reliably derived in low relief areas. The TPI product was derived from Smoothed Digital Elevation Model (DEM-S; ANZCW0703014016), which was derived from the 1 second resolution SRTM data acquired by NASA in February 2000. A masked version of the TPI product was derived using the slope relief classification product. The 3 second resolution dataset was generated from the 1 second TPI product and masked by the 3” water and ocean mask datasets.