I build models up from terrain data and satellite images that are combined with local survey data. My normal workflow in Maya is to Import the Terrain Data Plane which I then Create a Render Node select a File and can then select a PSD or Jpeg image with the Satellite Imagery, Enabling Hardware Texturing for perspective allows me to see it in that view and build up from there.
Im just trying to convert my workflow, But I have hit a bit of a brick wall with the applying a texture and viewing it in the viewport?