Geog170 notes

Geog170 notes - 12:01:00 ← Geog170 ← ← 1/28 ←...

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Unformatted text preview: 16/02/2009 12:01:00 ← Geog170 ← ← 1/28 ← Oldest known map- clay tablet- Mesopotamia circa 2500 BC ← ← Real Maps- any tangible form that can be directly viewed • Paper/ chart/ globe ← Virtual Maps- mental images we have in our mind that define and respresent an area • Images that can been seen but are not permanent- internet, google map • Navigation Systems: GPS • GIS Systems ← Types of Real Maps: • Topographic: shows features on top o Equal lines of elevation o Bodies of water o Roads • Thematic: portraying a certain theme o Population density, pollution • Remotely sensed image- captured by satellite or aircraft from above ← 2/2 • Geodesy: the science of making measurement on the earth • Models of the Earth o Sphere o Ellipsoid Defined by axis Mathematical model WGS84, WGS72, Carke 1866 o Geoid- physical model Shape is defined by the density of the earth- distorted Model is formed by high and low dense places on earth o Coordinate Systems Cartesian coordinates Polar coordinates Geographical coordinates • Latitude & Longitude o Meridians- formed by great circle o Parrallels- latitude At angels to meridians Equator only great circle of lat all others are small circles o Graticule: pattern of meridians and parallels on the earth Based upon mathematical measurements Characteristics of Graticule: Conformality Equivalence Distance Direction ← 2/9 • Projections: a spherical surface cannot be transformed into a plane withour modifying the surface geometry- distorted in some way o Projections control the conversion from globe to flat map so that the...
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Geog170 notes - 12:01:00 ← Geog170 ← ← 1/28 ←...

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