GRASS GIS Birthday

29 July 1983

Jim Westervelt working on a GRASS map in the early 1980's at CERL

GRASS v4 manual signed by Jim Westervelt @ FOSS4G 2004

The first user manual for (what would become) GRASS GIS titled “GIS Version 1 Reference Manual” was published by J. Westervelt and M. O’Shea, on 29 July 1983. Jim Westervelt began work on what would become GRASS GIS earlier through his master's thesis, but the publishing date of the first user manual is the celebrated birth date of GRASS.

37th Birthday

Celebrated through a Zoom online gathering, on 2020-07-29.