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Boundary Waters Quetico Forum Quetico Forum QUETICO HYDROGRAPHIC MAPS |
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07/20/2016 09:28AM (Thread Older Than 3 Years)
I see on the Ontario MNR website there are a few lakes with crude hydrographic contour lines. Does anyone know anything about these or if they plan on sounding more?
http://www.web2.mnr.gov.on.ca/fish_online/fishing/fishingExplorer_en.html
http://www.web2.mnr.gov.on.ca/fish_online/fishing/fishingExplorer_en.html
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07/20/2016 07:47PM
Took a look at the ones they have in there already, unless there is another version not sure what they are trying to do as I could do a better job with my vexilar paddling around :)
The Darky Lake one is way off, it looked like max depth is 46 feet?
T
The Darky Lake one is way off, it looked like max depth is 46 feet?
T
07/21/2016 08:24AM
Does anybody know what the standard method for producing the map lake depths is? Is it possible to get the depth from some sort of radar or something from the air? Or does someone need to take a boat over the entire lake and use some sort sonar/depth gauge?
I know the radar (or lidar or whatever) used to get the terrain contours bounces off the water and does not penetrate to indicate water depths.
I know the radar (or lidar or whatever) used to get the terrain contours bounces off the water and does not penetrate to indicate water depths.
07/21/2016 10:33AM
quote timatkn: "Took a look at the ones they have in there already, unless there is another version not sure what they are trying to do as I could do a better job with my vexilar paddling around :)
The Darky Lake one is way off, it looked like max depth is 46 feet?
T"
Those measurements are in meters so that's 150'
07/21/2016 11:50AM
quote RC: "Does anybody know what the standard method for producing the map lake depths is? Is it possible to get the depth from some sort of radar or something from the air? Or does someone need to take a boat over the entire lake and use some sort sonar/depth gauge?
I know the radar (or lidar or whatever) used to get the terrain contours bounces off the water and does not penetrate to indicate water depths."
Ontario probably uses methodology similar to Minnesota. Here is a link with a description of how lake maps are produced:
Lake mapping in Minnesota
"Said one of these men, long past seventy years of age: 'I could carry, paddle, walk and sing with any man I ever saw. I have been twenty-four years a canoe man, and forty-one years in service; no portage was ever too long for me. Fifty songs could I sing. I have saved the lives of ten voyageurs. Have had twelve wives and six running dogs. I spent all my money in pleasure. Were I young again, I should spend my life the same way over. There is no life so happy as a voyageur's life!'"
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