Observation simulation for science tools checkout
The tools in this area are gtobssim and gtorbsim. gtobssim has many sources available to it, some of which are described in Sources available to obsSim.
Short descriptions of the tools and links to the available documentation are on the tools summaries page.
From a comment by Jim Chiang for Checkout 1: gtorbsim is a simple interface to the pointing mode options that are calculated in the GPS class of the astro. As far as I can tell, the comments in astro/GPS.h are the only documentation of these various pointing modes.
7 April - Here are the results so far of my examination of gtobssim. (Stephens)
8 April - Added a page reviewing the ObsSim.py GUI. (Stephens)