lecture 2 ppt

lecture 2 ppt - Earth's dimensions Measuring Earth in 247...

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1 Earth’s dimensions Figure 1.9 Measuring Earth in 247 B.C. Figure 1.10 Latitude Figure 1.11 Latitudinal regions Figure 1.15 Longitude Figure 1.14 Lines of longitude = meridians Measuring Longitude The idea is that earth rotates at about 15 degrees in 1 hour. So if you could measure how far you traveled in time you could calculate how far in distance you had gone
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Prime Meridian and Standard Time Time zones represent about 15 degrees of longitude Now use UTC based on atomic clocks in Paris Maps, Scales, and Projections Map – a generalized view of an area, as seen from above (plan view) or from the side (profile view) and reduced in size Scale – ratio of map units to ground units Projection – process of transforming spherical Earth to flat map Globe properties Parallels are always parallel Meridians converge at the poles Parallels and meridians always cross at right angles Map projections Problem is maps are flat so some distortion occurs. Conformal projection – shapes are preserved
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This note was uploaded on 04/25/2008 for the course GEOG 121 taught by Professor Long during the Spring '08 term at Wisc Oshkosh.

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lecture 2 ppt - Earth's dimensions Measuring Earth in 247...

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