Thanks for the link, I'll look at it.
However I'm sure that Luke is right about the tides at particular spots. I
sail in Exmouth and the tide can do very odd things since you get the
effects of the estuary draining out over a few hours.
Poole harbour has an even more amusing tide that is effected by the Isle of
Wight I believe. On some tides you get a whole day of water and on other
days you get the water coming in and out, in then out again within the same
outgoing tide. Take a look Poole graph at
http://www.bbc.co.uk/weather/coast/tides/south.shtml - very odd.
Strange but a fun place to sail.
Cheers,
James
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, April 13, 2006 7:03 PM
Subject: Re: [backstage] 7 Day Tide data
I'd be incredibly warey of trusting a one-stop shop for tidal data, since
depending on your location (not in relation to the moon but as in
geography of
your area), it can get highly messed up. Theres one used on the RYA
yachtmaster
course thats a sort of "look how crazy this graph is" example, I forget
exactly
where, its either Norfolk Broads or could well be the Isle of Wight
(somewhere
a bit weird to begin with like :P). It has multiple highs and lows per day
with
no perceivable pattern day-to-day (its actually at the confluence of
several
tidal streams, so what you see is them working against each other). But
yeah,
algorithmic will give you a highly naive answer based i would imagine on
normal
distribution / rule of twelths and all that, whereas true tidal times and
flows
vary amazingly from place to place (even local places). Proper predictions
for
"major" ports and curious zones as usually published is the best way
forward
for making it truly usable.
Another keen sailor
Luke
Quoting Nic <[EMAIL PROTECTED]>:
"Ben Metcalfe" <[EMAIL PROTECTED]> writes:
I'm guessing that tide data might be even harder to get than
the weather data feed, but I would love to be proved wrong.
So off the top of my head, can't tides be computed using an
algorithm?
As long as the moon doesn't suddenly start doing something different:
http://aiuas3.unibe.ch/dpgm/zm_graph_tide.html
Nic
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