Many of the Ecosystem Services Modeler (ESM) models were based on an early version of the InVEST software system developed by the Natural Capital Project. A few of the InVEST models have undergone substantial change made by the Natural Capital Project since their incorporation into ESM in TerrSet. In the future we hope to update ESM to use these newer implementations. In the meantime, we strongly suggest that you download the free InVEST software system from the Natural Capital Project at:
InVEST supports all raster formats supported by GDAL. This includes TerrSet. Thus you can use TerrSet raster data as inputs to InVEST.
Thank you for your understanding.