Tools were made available to assist in the development of complex spatial models using Dana Tomlin’s Map Algebra concepts.
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Programs to manipulate LiDAR data include ENVI, ERDAS IMAGINE, ArcInfo, and ESRI ArcView (with 3D analyst ext.) One useful derivation of LiDAR data is the DEM (Digital Elevation Model).
A viewshed analysis can be performed using one of many GIS programs, such as GRASS GIS (r.los, r.viewshed), SAGA GIS (Visibility), TNT Mips, ArcMap, Maptitude, ERDAS IMAGINE.