compass rose
shows directions
cardinal directions
N [north], S [south], E [east], W [west]
intermediate directions
NE, NW, SE, SW
map key
explains symbols or colors used on a mpa
legend
explains symbols or colors used on a mpa
scale
- helps us find real distance on earth when measuring the distance on the map
- usually measured in miles or kilomaters
parts of a map
1) compass rose
2) map key or legend
3) scale
hemispheres
- halves of the earth
- run northern to southern or
- run eastern to western
equator
imaginary line that divides the earth into Northern and Southern hemisphere [halves]
prime meridian
imaginary line that divides the earth into Eastern and Western hemisphere [halves]
latitude
- horizontal lines [parallels that ring the earth]
- measured in degrees
what latitude is equator?
0 degrees
longitude
longitude is long
longitude
- vertical lines [meridians] that ring and intesect at the Nroth and South Pole
- measured in degrees east or west of Prime Meridian
- Prime Meridian is 0 degree longitude
kinds of maps
1) physical map
2) politial map
3) speciality map (special use)
physical map
- shows natural features
- landforms [mountains, valleys]
- bodies of water [rivers, lakes, oceans]
political map
shows things made by people [cities, states, capitals, countries]
specialty maps
- usually shows one kind of information
- some examples are population, rainfall, elevation
GPS
global positioning system
What is GPS used for?
used to find location in cars, planes, & ships
GPS
- 24 satellites in space
- orbit 12,000 miles above Earth
- Makes 2 orbits a day [traveling 7,000 mph]
- Satellites are solar powered & weigh about 2000 pounds
GPS Receivers
GPS information from satellite to find location
GPS location
needs at least 3 satellites to find 2D position and 4 or more to find 3D
What do maps show
maps show land on a flat surface like paper or a computer screen
