The
Map Overlay and Statistical System (
MOSS), is a
GIS software technology. Development of MOSS began in late 1977 and was first deployed for use in 1979. MOSS represents a very early
public domain,
open source GIS development - predating the better known
GRASS by 5 years. MOSS utilized a polygon based
data structure in which point, line, and polygon features could all be stored in the same file. The user interacted with MOSS via a
command line interface.