csabie wrote:
I down load a map from USGS as a geo.tif.
I try to open it in TransDEM 'OPEN DEM'.
What kind of geo data is this, a DEM or a raster map? I would guess a raster map, as jpeg wouldn't make much sense for a DEM, because it's a lossy compression.
TransDEM will treat TIFF files very differently for both cases, but may also fail. TIFF is a container format and has many options to encode the data within. TransDEM supports the most common encodings but will surely reach its limits when it comes to certain more exotic variants. Hence I am not sure whether TransDEM can handle jpeg inside TIFF for a raster map.