Underwater Cartography: The Art of Bathymetry
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Transcript of Underwater Cartography: The Art of Bathymetry
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Underwater
Cartography:
The Art
of Bathymetr
y
By Alan Lee an
d Neil Fitzhar
ris
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Aquaman, Manager of FishFish stocking quotasFish stocking quotas
Chemical rehabilitationChemical rehabilitation
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For the Rock Lovers
Estimate rates of sedimentation.Estimate rates of sedimentation.
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So I’m not a limnologist, hunter,
fisher, or natural resources
manager. What do bath measurements
have to do with me?
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If I Were the Most Ballin’ I-Banker This
is How I Would Do Bathymetry…
A sonar sends out sound to make the A sonar sends out sound to make the map. map.
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Gorilla Positioning Satellite
(Because That’s What I’d Use
it For)Go across the lake on transects.Go across the lake on transects.
Check whether you’re going straight Check whether you’re going straight through longitude and latitude.through longitude and latitude.
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Two guys. One boat. No motor. Junk GPS. Line of sight methodLine of sight method
Used raft, didn’t work wellUsed raft, didn’t work well
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Bathymetry, the Jack Lalanne Way!Got out and dragged the boat.Got out and dragged the boat.
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Island Hoppin’
Took perimeter of lake, except for near Took perimeter of lake, except for near cliff wall.cliff wall.
Took points on islands.Took points on islands.
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Calculations
Surface Area: 68,537 mSurface Area: 68,537 m22
Volume: 69,887 mVolume: 69,887 m33
Maximum Depth: 2 m Maximum Depth: 2 m
Average Depth: 0.87 mAverage Depth: 0.87 m
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What’s left…
More work on the map
Groundtruthing
Long-term storage of data
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Future Bathymetry
Caution against doing bathymetry over again.
Develop fish management plan.
Sedimentation and geology studies.
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Thanks! Arigato! Danke! Mm goi! Merci! Mahalo! T’anks ah! Xie Xie!We appreciate the help of Brien We appreciate the help of Brien Holsapple for lending us the boat, Holsapple for lending us the boat, Professor Dina Leech for advice and Professor Dina Leech for advice and help, Beth Wilkerson for her invaluable help, Beth Wilkerson for her invaluable assistance with ArcGIS, and all you assistance with ArcGIS, and all you guys for a great semester and for your guys for a great semester and for your time and attention!time and attention!