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24 Cards in this Set
- Front
- Back
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What are parallels?
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One set of circles that describe the position on the earth.
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What is latitude?
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The angular distance north or south of the equator.
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What are meridians?
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They are used to describe locations east or west of the prime meridian.
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What is the prime meridian?
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The meridian at 0 degrees.
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What is Longitude?
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The angular distance measured east or west of the prime meridian.
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What is a great circle?
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Any circle that divides the globe into halves.
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What are geomagnetic poles?
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The points on the earths surface just above the poles of the imaginary magnet.
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What is magnetic declination?
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The angle between true north and geomagnetic north.
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What is true north?
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The direction of geographic north.
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What is cartography?
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The science of map making.
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What is a map projection?
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A flat map the represents the earth surface.
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What is a Mercator projection?
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Mercator projections show accurately:
Areas near the equator are accurate. Compass directions are straight and true. N S E W Latitude and longitude are accurate. Shapes of oceans and continents are accurate. Mercator Bad: Land and ocean areas near the poles are greatly distorted in size. Meridian appear as equally- space, straight, parallel lines when actually they meet at the poles. |
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What is a gnomic projection?
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Gnomonic Map:
Areas near the point of contact (usually one of the poles) are fairly accurate. Great circle appear as straight lines. Therefore, the shortest distance between two points is a straight line drawn on this map. Navigators on ships and aircraft can easily find the great-circle route. Gnomonic bad: Distortion of distance and direction increases as the distance form the point of contact increases. This projection can show only one-half of the world on one map. |
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What is a conic projection?
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Conic projection map:
Areas near the parallel of latitude where the cone touches are fairly accurate. Conic map bad: Areas far from the line of contact are distorted. |
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What is a Polyconic projection?
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Conic projections put together.
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What is a legend?
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A list of symbols and their meanings.
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What is a scale?
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The length on a map that equals the distance in real life on earth.
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What is elevation?
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Height above sea level.
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What is mean sea level?
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The midway point between the highest and lowest point on a map.
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What are contour lines?
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Lines around an area to show elevation. Brown lines in circular shapes.
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What are contour intervals?
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The difference in elevation between one contour line and the next.
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What is relief?
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The difference in elevation between the highest and lowest points of the area being mapped.
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What are index contours?
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To make reading a map easier, every fifth contour line is printed bolder than the others. These show the elevation on them.
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What are depression contours?
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These show depressions with short straight lines in them.
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