Distance north or south of equator:
latitude --measured in degrees
Distance east or west of Prime Meridian
longitude--measured in degrees
Equator
imaginary line running sideways around Earth (like a belt).
0 degrees
Prime Meridian
imaginary line running long ways around Earth; 0 degrees
Do all maps distort some part of Earth's surface?
Yes. Different maps distort different parts
Mercator Projection Map
1569; sailors still use; shows directions accurately! Distorts size & distance
Robinson Projection Map
shows distance, size & shape accurately. Distorts around the edges of map
Conic Projection Map
much distortion in areas away from particular latitude; used to make road & weather maps
Gnomonic Projections
shows shortest distance between 2 points accurately
Topographic Map
shows 3 D surfaces (mountains, bodies of water, buildings) in 2 dimensions; uses contour lines to show elevation
contour lines
contour lines show a particular elevation; adjacent lines show change in elevation.
contour lines: circles
circles represent a hill
Geologic Map
shows the type and age of exposed rocks in an area
What can GPS be used for?
track wildlife, study earthquakes & measure erosion. (Do we give up privacy for this convenience?)
Distance north or south of equator:
latitude --measured in degrees
Distance east or west of Prime Meridian
longitude--measured in degrees
Equator
imaginary line running sideways around Earth (like a belt).
0 degrees
Prime Meridian
imaginary line running long ways around Earth; 0 degrees
Do all maps distort some part of Earth's surface?
Yes. Different maps distort different parts
Mercator Projection Map
1569; sailors still use; shows directions accurately! Distorts size & distance
Robinson Projection Map
shows distance, size & shape accurately. Distorts around the edges of map
Conic Projection Map
much distortion in areas away from particular latitude; used to make road & weather maps
Gnomonic Projections
shows shortest distance between 2 points accurately
Topographic Map
shows 3 D surfaces (mountains, bodies of water, buildings) in 2 dimensions; uses contour lines to show elevation
contour lines
contour lines show a particular elevation; adjacent lines show change in elevation.
contour lines: circles
circles represent a hill
Geologic Map
shows the type and age of exposed rocks in an area
What can GPS be used for?
track wildlife, study earthquakes & measure erosion. (Do we give up privacy for this convenience?)