representing earth’s surface
Post on 23-Feb-2016
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Representing Earth’s Surface
Global Grid• Two measurements are used to describe
locations around the world.• Latitude: distance north or south of
the equator • Longitude: distance east or west of
the prime meridian
Earth Measured in degrees Just like a circle the earth has 360 degreesLines of latitude are east-west lines around the
globeLines of longitude are north-south lines around
the globeThe equator and prime meridian are 0°Expressed as degrees east or west & north or south
Pair share: what is the latitude and longitude of the X? x
Maps distort the earth: making some areas too big or small
4 types of map shapes / styles of maps for different purposes
Mapping: flattening the Earth
Developed in 1569 to help sailors travel the globeDistorts the size and shapeAccurate directions
Mercator Map
Pair share: what do you notice about the grid boxes in this map?
Shows distance, size and shape accuratelyDistortions around the edges
Robinson Projection Map
Used for road and weather map accurate over a small areaDistorted over a larger area
Conic Projection Map
Made by placing a piece of paper on a single point on the globe’s surface Distance and direction are distorted, but used
by sailors over short distances.
Gnomonic Projection Maps
1. How many degrees are used to measure the Earth?
2. What 2 places are zero degrees on the globe?
3. Name 2 problems with making accurate maps?
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