mapping our world
DESCRIPTION
2.1 Latitude and Longitude. Mapping our world. Cartography - science of map making. Uses imaginary gridlines to locate exact points on Earth The Equator separates the N and S hemispheres. The Prime Meridian separates the W and E hemispheres. Latitude. Run parallel to the Equator - PowerPoint PPT PresentationTRANSCRIPT
MAPPING OUR WORLD2.1 Latitude and Longitude
Cartography- science of map making Uses imaginary gridlines to locate exact points on
Earth The Equator separates the N and S hemispheres
The Prime Meridian separates the W and E hemispheres
Latitude Run parallel to
the Equator The Equator is
0o latitude The poles are
located at 90o N and 90o S
Longitude Semicircles that
extend pole to pole The Prime Meridian
is 0o longitude Points west are
numbered 0o-180o W Points east are
numbered 0o-180o E
Time Zones There are 24 time zones on Earth Approx. 15o wide Some time zone boundaries may be shifted in
order to make it more convenient locally
U.S Time Zones
Calendar Dates The International Date
Line is located at the 180o meridian
Traveling west across the International Date Line, you would move into tomorrow
Traveling east across the International Date Line, you would move into yesterday
MAPPING OUR WORLD2.2 Types of Maps
Maps- flat projections of a 3D Earth
Mercator ProjectionParallel lines of
latitude and longitude
Landmasses near poles are exaggerated
Conic Projection Projects points and lines from a globe onto a cone Distorts at top and bottom Very accurate for small maps Used for making road and weather maps
Gnomonic Projection Makes Great Circles Distort land and
distance Shortest distance
between two points Useful for plotting
long distance air and sea travel
Topographic Maps Detailed maps
showing hills and valleys
Show changes in elevationMountainsRiversForestsEtc…
Topographic Maps Contour Lines
Connect points of equal elevation
Never cross Contour Intervals
Steeper terrain will have closer lines or larger intervals
See Index Contours
Depression Contour Lines Distinguish
areas of lower elevation than the surrounding terrainVolcanic cratersMinesSinkholes
Map Legends and Scales Map Legends
Explanation of symbols found on a map
Map ScalesRatio between the
distances on a map and actual distances on the surface of the Earth
May be graphic or verbal
MAPPING OUR WORLD2.3 Remote Sensing
Remote Sensing The process of
collecting data about Earth from far above Earth’s surface
Electromagnetic Spectrum Satellites detect different wavelengths of
energy reflected or emitted from Earth’s surface
Visible light, gamma rays, X rays, UV rays, infrared rays, radio waves, and microwaves
Landsat Satellites Use visible light and infrared radiation to
map Earth’s surface
This picture shows how the Texas coast was scarred by Hurricane Ike
Global Positioning System (GPS)
Radio-navigation system of at least 24 satellites
Allows users to determine exact position on Earth
Sea Beam Relies on sonar to
map ocean floor Uses sound waves to
detect and measure objects under water
Sound waves are sent out and a receiving device picks up the echo and calculates the distance