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# GY 208 Week 3, part 2 GY 208

Jacksonville State University
GPA 3.25

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GY 208 Map Reading
COURSE
PROF.
Larry J. Morgan, Daniel Mcgowan
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
KARMA
25 ?

## Popular in Geography

This 2 page Class Notes was uploaded by Madison Smith on Thursday September 15, 2016. The Class Notes belongs to GY 208 at Jacksonville State University taught by Larry J. Morgan, Daniel Mcgowan in Fall 2016. Since its upload, it has received 3 views. For similar materials see Map Reading in Geography at Jacksonville State University.

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Date Created: 09/15/16
GY 208 – 09/08/2016 Great and Small Circles • Great Circle: largest circle you can draw on a sphere o Example: equator o Example: sliced straight through the middle of the Earth *All meridians and corresponding meridians are great circles *The equator is the only great circle that is a parallel • Small Circle: creating circles that aren’t great circles; not through the center o All parallel (besides equator) are small circles {average diameter of earth x cos(latitude) = great circle or small circle} (24,874) Graticules on Maps • Small scale maps: one inch per one degree • Geocentric versus Geodetic *Only matters on detailed maps (cities and states) not ones of countries, continents, and the world • Large scale map: covering a small area o Some Topographic types o Nautical – more detailed (precise minutes and seconds) Geodetic Latitude and Longitude on Large Scale Maps • Horizontal Reference Datum is the control point for georeferencing o North American Datum of 1927; redone in 1980 ’s • Europe uses European Datum of 1950 Earth as a Geoid • Earth’s variance th o 12.3 Miles – 1/640 of Earth’s Distance around • Geoid: mapping the Earth based on gravity o surfaces of equal gravity used as a reference of elevation • Elevation is based on mean sea level • Vertical datum gave us an average elevation Gravity and Elevation • National Geodetic Vertical Datum of 1926 o Took measurements from 26 total Tidal Gauges § 21 in US, 5 in Can. § 500,000 Benchmark placed from 26 sites • North American Vertical Datum of 1988 used 1 tidal gauge site ’s data located in Quebec

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