Created in Chicago with Tom DeFanti's Graphic Symbiosis System GRASS, consists of sixteen "objects", each composed of 100 points of light, some of them geometric shapes like circles and squares, others more organic shapes resembling gushes of water.
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.
grass | Günter Grass | Leaves of Grass | The Grass Roots | GIS | Splendor in the Grass | New Grass Revival | Grass Valley, California | The Grass Harp | Mittendorf's striped grass mouse | GRASS GIS | Splendor in the Grass (album) | Green Grass and High Tides | GRASS | buffalo grass | Wild Grass | The Green Green Grass | The Grass Is Greener | The Grass Is Blue | The Death of Grass | St. Augustine Grass | In the Grass | Grass Valley | Grass Snake | Grass | Elephant grass | elephant grass | Buckaroo Blue Grass II | Buckaroo Blue Grass | Blue Grass Stakes |
2006 - Markus Neteler - GRASS GIS developer since 1998 and founding-member of Open Source Geospatial Foundation ( OSGeo )