U.S. PJs take media law courses in college to learn their rights and responsibilities. In the past, I've considered it redundant to post this information on this blog.
However, after a particularly annoying incident today in a public park, I've determined many people are either ignorant or are just control freaks. So, here is a link to the ACLU's "Know Your Rights" post for photographers (it covers the same information posted in 2005).
In general, if you are standing on public property and not impeding emergency or police activities, you can shoot whatever you can see. It's a Constitutional right for every person standing on U.S. public property. There's no debate.
If you don't want photos of yourself or your objects, don't be within plain sight of public property. The Constitution is the basis for - and thereby trumps - all other laws.
Enough for now,