[Talk-us] Civil Defense Sirens?

[Jeffrey Ollie]

On Mon, May 3, 2010 at 11:46 AM, Ian Dees <ian.dees at gmail.com> wrote:
> On Mon, May 3, 2010 at 11:41 AM, Jeffrey Ollie <jeff at ocjtech.us> wrote:
>>
>> With the start of Tornado season in the Midwest upon us, I thought it
>> would be interesting to map civil defense sirens:
>
> That would be fun. I'm up for making that a "US Project of the Week" if the
> international folks aren't willing to help :).
> Are the rural ones visible from aerial imagery?

Only if you have very very good imagery and know what you are looking
at.  In Google's higher resolution imagery you can see them if you
know what to look for and then if there's street view imagery
available you can confirm.  Obviously you can't trace from Google
imagery though.  I'd link to an example on Google if people think
that's appropriate.

> Perhaps we could start
> researching which states/areas have active sirens?

Well, Iowa for sure and I'm sure most of the states that are in
"Tornado Alley" have them and are well tested.  In Iowa it's customary
to test them at noon on the 1st Saturday of the month unless there is
imminent severe weather.

-- 
Jeff Ollie