Example: SFO's Noise Impact
This (trivial) example looks at airport noise
affecting my home in Northern California
The San Francisco Bay Area
has several airports
but only three of these (the international airports
have lots of jet aircraft
flying in and out:
Harvesting the information (and links) above helped me to form an ontological view.
The diagram below summarizes this view, in terms of some relevant pages:
Although SFO is owned by San Francisco
it is located in San Bruno
, a few miles from my house.
OAK is easily visible, but it's across the SF Bay
SJO is dozens of miles away, down the SF Peninsula
In short, SFO is the only airport whose noise concerns me.
Better yet, my house doesn't sit below most
of SFO's low-altitude flight paths (i.e., airways
So, aside from occasional rumblings of jets warming up,
I hear very little airport noise when I'm at home.
However, I generally expect to hear departing aircraft
(and concomitant car alarms) when I'm in downtown San Bruno
or South SF
Several cities are located near SFO,
but only a few unlucky areas get much airport noise.
South SF is almost entirely on the takeoff path,
as is the northeast portion of San Bruno.
So, these folks hear (and feel) most of SFO's takeoffs.
and the remainder of San Bruno get very little noise.
The northeast portion of Millbrae
is near the landing path,
but the planes travel up the bay to SFO.
Also, landings tend to be quieter than takeoffs.
Here's another diagram, hinting at some of this information:
There are many other things that the diagrams above could have shown.
For example, they could say more about San Bruno's global context.
Here is a (very abridged) view
showing "neighbors" at several geographic levels:
As an inquiry proceeds, the set of relevant pages can grow very quickly.
In this trivial example, we've touched on more than two dozen pages:
Indeed, the number of potentially relevant pages
(i.e., related in some
manner) includes most of Wikipedia
Keeping this information explosion under control,
while retaining relevant (let alone useful) context,
is one of the hardest problems Ontiki
This wiki page is maintained by Rich Morin
an independent consultant specializing in software design, development, and documentation.
Please feel free to email
comments, inquiries, suggestions, etc!