On Mon, May 3, 2010 at 12:29 PM, Lord-Castillo, Brett <blord-casti...@stlouisco.com> wrote: > Just wondering what would be the purpose of mapping civil defense sirens?
Because they are there isn't a good enough reason? > You have to make some significant decisions of what kind of information to > include about the sirens (for example, without range and/or model, you cannot > derive projected coverage; without directional coverage you cannot identify > nearest covering siren). Right now I'm just interested in where they are... More information is welcome but obviously that can be more difficult to obtain. > Sirens are also one of those areas (like mapping major pipelines) that do > fall under homeland security protections for sunshine laws. Without some proof I call FUD. Anyway, sunshine laws are for governments, not for individual citizens. I'm not expecting people to drop in on the local emergency management agency and ask for a map of all the sirens... > Some jurisdictions (mostly cities) are open with their siren locations, some > of them are very protective (mostly those places whose sirens have been > subjected to attacks by siren hackers in the past or who have particularly > significant security concerns). I don't see how mapping sirens really increases the security concerns... Most civil defense sirens near me are mounted on tall towers and advertise their location quite loudly on a regular basis. The ones that I have mapped recently have no physical protection either, not even a fence around it (except one that is literally in someone's back yard). > Mapping site specific sirens (like those used for electric generation > facilities) can especially draw scrutiny. Well, hanging around an electric generation plant and surveiling it is likely to draw scrutiny no matter what you are looking for. > As for the feasibility, I recently did a project to map 210 sirens from > aerial photos and ground work, and it was virtually impossible without prior > knowledge of the siren locations and high resolution aerial oblique photos. > In all, it took about 60 hours of work (and that was with a list of > locations). Hey, I'm not expecting miracles! I was really expecting people to take a walk around their neighborhood and note the locations of the sirens, much like they map their favorite pub. Eventually we'll get them all... -- Jeff Ollie _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
