geo8-24 - 8/24/2011 Introduction What is geography: earth/...

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8/24/2011 Introduction What is geography: earth/ describe Approaches - systematic : looking at soils over the earth’s surface rather than a regional standpoint - regional : arbitrary, homogeneous character; in some cases the region has a core and there may be some influence that comes out from that - man - environment The Earth Shape : oblate spheroid -diameter 7927 miles -27 miles shorter thru poles Most of northern hemisphere is land Most of southern hemisphere is water -depths: can go about 6800ft BS (oil drilling) Crust : what we live on Density of 2.7 Mantle : layer below crust Density of 3.3 *Density is relative to the density of water Maps and grid systems Problem : trying to take a sphere and put it on a flat piece of paper Map properties -direction/azimuth (360 degree compass) -distance -area/relative to each other -shapes *Area and shape will not be shown accurately on the same map because of the earth’s three dimensional form Types of projections : how to get the globe on a flat piece of paper -Planar/plane : take a flat surface and project from the center of the globe and stretch it over the surface - Conic : cone down on top of the globe - Cylindrical : a tube over the globe, needs to be stretched either way to get the whole thing on there; Mercator maps *the most accurate areas are where the shape(cone, flat surface, cylinder) come into contact with the globe -Math/others Scale - verbal Ex. One inch=one mile - Graphic Ex. 0____1____2____3 - Fractional 1/62, 500; 1/63360 Small scale vs. large scale
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geo8-24 - 8/24/2011 Introduction What is geography: earth/...

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