An interesting presentation (~8MB PowerPoint file) on the National Geospatial-Intelligence Agency’s aerial imagery of Minnesota, which seems to be available through the little-known National Map website.

One aspect of homeland security not often talked about is chemical security - specifically, chemical terrorism vulnerability information, or CVI, in government parlance. Once you go looking, though, you’ll find everything you might want to know on the subject, whose protection is taken quite seriously. How serious? Consider the guidelines for disclosing the covered types of (very broad, might I add) information, and this wonderfully useful cover sheet full of ominous warnings…