In The Martian, the whole reason that NASA end up trying to help stranded astronaut/botanist Mark Watney is because someone happens to notice that since the Hermes left Mars, the "base camp" on Mars has changed between satellite pictures taken on two seperateseparate days.
From this discovery, NASA conclude that Mark Watney might still be alive, and so begin their attempts to contact him.
However, the woman who notices the differences between the satellite images of the base camp is only looking because she receives a message from Vincent Kapoor asking her to take a look.
Why would Vincent be asking her to look at the images from those two days when it was established in an earlier scene that they cannot afford the satellite time to do that?