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Haoman1722-Oct-06 7:58
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QuestionWhat is the 13th root of . . . Pin
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QuestionHow to draw thick lines using Bresenham's Algorithm? Pin
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QuestionRUNGE-KUTTA ALGORITH FOR SECOND-ORDER ODE Pin
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QuestionTidal elevation calculation Pin
El Corazon12-Oct-06 11:47
El Corazon12-Oct-06 11:47 
This may just be lack of knowledge on my part... not sure if I have enough information to calculate this or not. I am googling right now, but not turning up anything on the specifics of my need but on all the side issues I alreay know.... Sigh | :sigh:

Okay... first what I need to do is calculate current ocean level minus wave motion. In otherwords the gravitational surface including the moon. I have already the gravitational surface of the earth (geoid) from NASA, and have had it for a couple of years now. I am one of the few people who use it. But I need to add in the tidal effect in ocean height based on the lunar cycle. Not sure if atmospheric pressure affects sea height noticeably, but I basically have a ship that I need an accurate height on and the ship based GPS locations seem to be putting out a very poor +-20 meter location even from one end of the ship to the other.

Theoretically I have proposed the following:
Using knowns (lat lon location, lunar distance and viewing angle from location, sea level based on gravitational surface of earth):
Calculate height of ocean based on pull of the moon
use this in a more accurate position.

I am not asking you to do this for me, but if you can point me to the right location, I will do it. I will keep googling various terms hoping to stumble across the calculation. No homework, I am long since out of school.

Thanks!
Jeff

P.S. yes, I live in a desert, ocean tidal effects are something I never had to worry about before....

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

AnswerRe: Tidal elevation calculation Pin
Dan Neely13-Oct-06 2:29
Dan Neely13-Oct-06 2:29 
GeneralRe: Tidal elevation calculation Pin
El Corazon13-Oct-06 3:17
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GeneralRe: Tidal elevation calculation Pin
Dan Neely13-Oct-06 3:36
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GeneralRe: Tidal elevation calculation Pin
El Corazon13-Oct-06 3:46
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fat_boy7-Nov-06 1:16
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GeneralRe: Tidal elevation calculation Pin
El Corazon7-Nov-06 2:06
El Corazon7-Nov-06 2:06 
Generalcalculus... [modified] Pin
Anton Afanasyev10-Oct-06 19:27
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Edbert P10-Oct-06 19:32
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Kastellanos Nikos10-Oct-06 23:19
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peterchen10-Oct-06 21:33
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