GRASS includes the NVIZ visualization suite which is capable of rendering spectacular 3D snd 4D images and animations from 2D and 3D raster and vector maps.

The keyframe animator in NVIZ can write directly to a MPEG or Xvid movie, or create a series of still frame images for use with another encoder. In addition, the r.out.mpeg module can be used to make a movie out of a series of raster maps.

For details, see the NVIZ user manual.

It is also possible to export GRASS 2D and 3D data to other powerful visualization software such as Paraview, MayaVi, and Vis5D+ using the VTK, V5D, and VRML output modules.

GRASS 6.2

Visualization of a USGS Digital Raster Graphics (DRG) map for Spearfish, South Dakota created with NVIZ screenshot: Markus Neteler
LANDSAT-7 image of Dunedin, New Zealand extracted from NASA's WMS with the r.in.onearth add-on module and draped over a 10m DEM. Spectral tuning was performed with the i.landsat.rgb module. screenshot: Hamish Bowman	Olympus Mons, Mars topography from Mars Global Surveyor MOLA data screenshot: Hamish Bowman

NVIZ keyframe animation tour of the North Atlantic from ETOPO data (movie, 4.0mb) animation: Bob Covill - Tekmap Consulting
Fly-through tour of Spearfish, South Dakota (movie, 3.0mb) animation: Bob Covill - Tekmap Consulting	South America's relief profile shown using a moving cutting plane in NVIZ (movie, 2.4mb) animation: Bob Covill - Tekmap Consulting

GRASS 6.0

Slovakia 3D precipitation voxel volume isosurfaces screenshot: Helena Mitasova	Slovakia precipitation 3D raster data with isosurfaces added in NVIZ screenshot: Helena Mitasova
3D vector object imported from DXF in NVIZ screenshot: Markus Neteler
ETOPO5 3-D tour of the Americas movie (MPEG, 2.5mb) animation: Bob Covill - Tekmap Consulting	The flight path for the ETOPO5 3-D movie screenshot: Bob Covill - Tekmap Consulting

GRASS 5

POV-Ray image created with the r.out.pov module screenshot: Markus Neteler	Click here and here to see more GRASS/POV-Ray examples and control scripts screenshot: Markus Neteler
Orthophoto draped over a high resolution DEM in NVIZ (near Hannover, Germany) screenshot: Markus Neteler

Crooked Arm and Doubtful Sound, Fiordland, New Zealand
At 836m Browne Falls is the tallest waterfall in NZ and the 9^th tallest in the world. Lake Chamberlain Falls, just to the north (right), is the world's 27^th tallest.
screenshot: Hamish Bowman
(Nautical chart NZ7624 courtesy of the LINZ Hydrographic Service,
Crown Copyright Reserved, redistribution permitted)

GRASS 4

Interpolation of dissolved inorganic nitrogen (DIN) in the Chesapeake Bay (MPEG movie)
animation: Helena Mitasova

Predictive error of interpolation
screenshot: Helena Mitasova

Change in spatial distribution of a chemical over several years, interpolated from well data scattered in 3D space and time using 4-variate interpolation and visualized as animated isosurfaces. Rendered in GRASS 4.1 with SG3d (the predecessor to NVIZ)
animation: Helena Mitasova

3D canyon fly-though movie made with the NVIZ keyframe animator. You might recognize this area from the GRASS startup screen.
animation: USACE / CERL

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