ET Terrain Viewer is a free software that allows the user to view GIS data in 3 dimensions. The user can load in the viewer Raster or TIN surfaces, Z enabled features and even plain 2D features by draping them on an existing surface, then navigate through the 3D environment using several different navigation techniques.

ET Terrain Viewer reads:

• Feature layers:
• Shapefiles
• Surface layers:
  • ESRI TIN datasets
  • Raster datasets
    • ESRI binary grid
    • Erdas Imagine image (.img)
    • TIFF format (.tif)
    • ESRI Ascii Grid

With ET TerrainViewer the user can

• Create 3D scene using any of the spatial data sources listed above.
• Use customizable lights, skyboxes and fog effects
• Set symbology using gradients, textures based on elevation or attributes.
• Identify 3D coordinates.
• Specify location of the observer and target using a 2D map.
• Walk over the terrain at user-defined offset from the ground.
• Define a route and have the observer follow it automatically.
• Be in control of the XYZ location of the observer and the target.