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120117a-Bathymetry-StartR

120117a-Bathymetry-StartR - BATHYMETRY Observations(facts...

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1/19/12 1 BATHYMETRY Observations (facts) Patterns Synthesis Hypotheses or Theory (explanation grounded in data and patterns of data) Understand what methods were used historically and are used today to make observations about the bathymetry of the oceans Examine the patterns of ocean bathymetry Understand the connections between ocean bathymetry, the origin of ocean basins, and the theory of plate tectonics Goals and Objectives Understand what methods were used historically and are used today to make observations about the bathymetry of the oceans Examine the patterns of ocean bathymetry Understand the connections between ocean bathymetry, the origin of ocean basins, and the theory of plate tectonics Goals and Objectives As new data emerges, new patterns might emerge, and new syntheses and explanations might emerge. It took centuries to develop a map of ± the earth ² Garrison, 2008 Coordinate system - but not numeric Elevations of Earth above sea level: ( ± topography ² )
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1/19/12 2 To make a bathymetric (or topograhic) map, need to know: 1. Depth (or elevation) relative to sea level 2. Location on Earth Eye level - relative elevation (elevation change) eye height stadia height Use multiple measurements to measure changes over longer lateral or vertical distance. Using the Eye Level Surveying Equipment 1. ± level ² on a tripod 2. tape measure (horizontal) 3. stadia rod (vertical) http://www.marinebio.net/ marinescience/01intro/ tomeas.htm Sophisticated eye-level on a tripod. Photo by: Mark R. Boardman
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1/19/12 3 Sophisticated eye level, stadia rod, measuring tape. Person in stream is part of a second measuring team. Photo by: Mark R. Boardman This survey mark, first set in 1917, is a bench mark, meaning it marks a point whose elevation above or below a geodetic vertical datum is known. Bench marks are just one type of survey mark set by the National Geodetic Survey and its predecessor organizations. celebrating200years.noaa.go
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