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Old 04 February 2008, 11:36   #11
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Country: UK - Channel Islands
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drain the lake

Had an out of the box sort of idea. You WILL need a decent pair of wellies or waders!

If you are able to drain the lake (assuming it is not a massive lake)!!

Walk the perimiter of the waters edge to give your datum level. Drain say 25cm of water and do the next contour by again walking the waters edge continue this process until you get to basin on lake.

Using a simple GPS or differential if you can back pack it will provide numerous points on the trail as you walk around.
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Old 04 February 2008, 15:05   #12
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Quote:
Originally Posted by daveyg
I guess my need is a one shot survey, of a 200+ acre lake in Berkshire
Quote:
Originally Posted by karlT View Post
If you are able to drain the lake
. . .or maybe not!
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Old 04 February 2008, 15:39   #13
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6 month forecast

6 month forecast of extreme drought throughout UK may help......

theory could work on much smaller water area
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Old 09 February 2008, 11:58   #14
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Have just stumbled across this site, while researching data for my final year project at university:

http://www.windmill.co.uk/seafloormapping.html

Its about mapping sea floors and maybe of some interest to you with what you are trying to do.

Rich
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Old 11 February 2008, 11:58   #15
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have a look at this

http://drdepth.se/
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Old 15 February 2008, 04:21   #16
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wow, pin outs on one site and decode software on the other, its CHRISTMAS. ok, reality says its no walk in the park, but we're taking small steps.

I'm still looking to target our weedboat more effectively, sharp echo ~= stones, scattered echo ~=mud, where the weed grows

The DIY option looks good as a fall back, but I have to assume that there is a commercial market for this stuff that we can hire / buy

Cheers
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