4 Volume data processing and visualization (demo)

Figure 14: NVIZ volume visualization of Slovakia rainfall data

A recent enhancement to GRASS is the capability to process raster volumes (voxels). This can be used to describe soil data or atmospheric data without the constraints of 2D maps. GRASS provides 3D spline interpolation and 3D map algebra as analytical tools. NVIZ was recently enhanced to display volumes (e.g., isosurfaces, see figure 14). We will show examples during the workshop. The Slovakia sample location is available from the Neteler & Mitasova 2004 book supplement Web site (http://mpa.itc.it/grasstutor/, see 2$^{nd}$ edition datasets).