Lecture02

Lecture02 - The Story so far Analytical and Computer...

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1 Analytical and Computer Cartography Lecture 2: Review: Map Projections The Story so far • Earth model for mapping: Ellipsoid • Datums standardized, earth centered • Memorable dimensions (40Mm and 111111km) • Scale transformation impacts detail and level of abstraction (generalization) • Next trasnformation: Round earth to flat map is T3 The longitude problem • Latitude has as a point of origin (the equator) and ends at the poles: distinct locations • It can be measured directly by observing the sun or the stars • Can also measure the tropics of Cancer and Capricorn • Not so for longitude • Hard to measure The longitude solution John Harrison’s Chronometer Won longitude Prize 1773
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2 At first, each country had its own prime meridian The International Meridian Conference (1884: Washington DC) “That it is the opinion of this Congress that it is desirable to adopt a single prime meridian for all nations, in place of the multiplicity of initial meridians which now exist.” “That the Conference proposes to the Governments here represented the adoption of the meridian passing through the center of the transit instrument at the Observatory of
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Lecture02 - The Story so far Analytical and Computer...

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