Here are a couple of places I found useful images:

• Digital Globe's photo of Chalmette (6486 X 3883 pixels), and
• the Sustainable Energy & Economy Network has a lot of the NOAA images in the areas of the refineries in more usable form than NOAA, and if you can stand it go to Post-Katrina environmental catastrophe: A Diary of Toxic Injustice and read their analysis.