underwater cartography: the art of bathymetry

Underwater

Cartography:

The Art

of Bathymetr

y

By Alan Lee an

d Neil Fitzhar

ris

Aquaman, Manager of FishFish stocking quotasFish stocking quotas

Chemical rehabilitationChemical rehabilitation

For the Rock Lovers

Estimate rates of sedimentation.Estimate rates of sedimentation.

So I’m not a limnologist, hunter,

fisher, or natural resources

manager. What do bath measurements

have to do with me?

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.

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.

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

Bathymetry, the Jack Lalanne Way!Got out and dragged the boat.Got out and dragged the boat.

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.

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

What’s left…

More work on the map

Groundtruthing

Long-term storage of data

Future Bathymetry

Caution against doing bathymetry over again.

Develop fish management plan.

Sedimentation and geology studies.

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!