Andy Weir's "The Martian": Satellite images question

In Andy Weir's "The Martian" NASA are able to track Mark Watney's activities using the satellite images.

I'm curious if the imaging equipment the Mars satellites have is powerful enough to deliver that level of detail?

For example they were able to see the rovers, popup tents, rover tracks, even Mark Watney himself.

Is it real or is a just about the only tech inaccuracy Andy Weir allowed in his work?