First of all, the 3-nmi line serves only as the boundary between state- and federally-controlled waters. The end of federal jurisdiction and the beginning of International waters actually occurs at the line 12 nautical miles from shore.
The official 3- and 12-nmi lines are demarcated on the highest-resolution NOAA charts for a particular area. These charts can be hard to find on-line, though it is possible to find certain areas though various state GIS websites and such. I also think the NOAA is systematically making vector data of the lines available.
In the case of Catalina Island, it has it's own 12-nmi belt of territorial sea, but the space between it and the mainland (so long as it is at least 12 nmi from either shore) is International waters.
There is a belt extending 24-nmi from shore called the "Contiguous Zone", in which a nation may exercize authority mainly to enforce environment and customs regulations. This area is still considered Internation waters, however.
What's interesting is that the new analysis seems to come not from many new observations in the past few hours, but rather previously undiscovered historical observations.
Back when the impact probability was 1 in 45, the NASA NEO page said it was deduced from 169 observations, from as early as June 19. Now the most recent verdict of no impact consideres only 118 observations, but from as early as March 15.
So not only were earlier, unused observations now taken into account, but the total number of data points decreased considerably.
I wonder what happened. This is quite different from how I would have expected the analysis to evolve.
The complication and aggravation of acquiring data like this on a town-by-town or county-by-county basis would be rendered moot if the state of Connecticut finally got its act together and instituted some sort of decent aerial imagery program.
All neighboring states have sort some of program in place; most are very good. New York has a recurring high-res orthoimagery program. Massachusetts recently produced a high-res, state-wide dataset. Even Rhode Island has one, I think.
But in Connecticut, we're forced to forage for scraps of incomplete or old data, or fight endlessly with paranoid towns like Greenwich. A centralized state-wide program for the acquisition and distribution of high-quality, current aerial imagery would not only be beneficial (and greatly appreciated), but as demonstrated by our neighbors, very feasible too.
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First of all, the 3-nmi line serves only as the boundary between state- and federally-controlled waters. The end of federal jurisdiction and the beginning of International waters actually occurs at the line 12 nautical miles from shore.
The official 3- and 12-nmi lines are demarcated on the highest-resolution NOAA charts for a particular area. These charts can be hard to find on-line, though it is possible to find certain areas though various state GIS websites and such. I also think the NOAA is systematically making vector data of the lines available.
In the case of Catalina Island, it has it's own 12-nmi belt of territorial sea, but the space between it and the mainland (so long as it is at least 12 nmi from either shore) is International waters.
There is a belt extending 24-nmi from shore called the "Contiguous Zone", in which a nation may exercize authority mainly to enforce environment and customs regulations. This area is still considered Internation waters, however.
What's interesting is that the new analysis seems to come not from many new observations in the past few hours, but rather previously undiscovered historical observations.
Back when the impact probability was 1 in 45, the NASA NEO page said it was deduced from 169 observations, from as early as June 19. Now the most recent verdict of no impact consideres only 118 observations, but from as early as March 15.
So not only were earlier, unused observations now taken into account, but the total number of data points decreased considerably.
I wonder what happened. This is quite different from how I would have expected the analysis to evolve.
> you're buying 260 HOURS of programming Funny how most box sets I've seen only have 4 or 5 DVDs, and not, say, 100...
The complication and aggravation of acquiring data like this on a town-by-town or county-by-county basis would be rendered moot if the state of Connecticut finally got its act together and instituted some sort of decent aerial imagery program.
All neighboring states have sort some of program in place; most are very good. New York has a recurring high-res orthoimagery program. Massachusetts recently produced a high-res, state-wide dataset. Even Rhode Island has one, I think.
But in Connecticut, we're forced to forage for scraps of incomplete or old data, or fight endlessly with paranoid towns like Greenwich. A centralized state-wide program for the acquisition and distribution of high-quality, current aerial imagery would not only be beneficial (and greatly appreciated), but as demonstrated by our neighbors, very feasible too.