Lab8_TopographicMaps

Lab8_TopographicMaps - Topographic Maps Topography of Mount...

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Topographic Maps Topographic Maps Topography of Mount Saint Helens from Google Maps (Terrain) Topography of Mount Saint Helens from Google Maps (Terrain)
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Zoomed in view of Mt. St. Helens Caldera - USGS Topographic Map of Mt. St. Helens Zoomed in view of Mt. St. Helens Caldera - USGS Topographic Map of Mt. St. Helens
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Topographic maps are used for: Navigation (i.e. planning hiking expeditions) Building roads Buying and selling property Original base map for your car’s GPS! Aid in measuring volcanic deformation Why do we care?
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TOPO MAPS A topographic map is a two dimensional representation of three dimensional space. Utilizes contour lines to show elevation . Contour lines are lines of equal elevation.
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Elevation is distance above sea level. A contour line connects points of the same elevation. If you walked around an entire mountain staying on the same contour line, you wouldn’t change elevation.
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Zoomed in view of Mt. St. Helens Caldera - USGS Topographic Map of Mt. St. Helens Zoomed in view of Mt. St. Helens Caldera - USGS Topographic Map of Mt. St. Helens
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Mt. St. Helens Eruption - 1980
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Historical Digital Elevation Models created from topographic maps Mount St. Helens before 5/18/80 eruption Mount St. Helens after 5/18/80 eruption
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Mount St. Helens
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Mt. St. Helens Eruption Lateral blast produced > 15 mile column of ash and gas Avalanches of hot ash, pumice, and gas (pyroclastic flows) poured out of crater at 50-80 mph, spreading 5 mi North 57 Human Fatalities (including USGS volcanologist David Johnston)
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How to read a topographic map? You’ll need the following key terms: Contour lines Compass Bearing
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Prime Meridian & Tropics
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Latitude lines run laterally , East to West.
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Lab8_TopographicMaps - Topographic Maps Topography of Mount...

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