FromGIS in Schoolsby Richard Audet and Gail Ludwig - Page 6 3.
Geography
Geography is the science that relates to all the features and
processes that occur on the surface of the earth.
FromGIS in Schoolsby Richard Audet and Gail Ludwig - Page 6 4.
Information
Information is the heart of GIS, where vast amounts of data are
stored and analyzed.
FromGIS in Schoolsby Richard Audet and Gail Ludwig - Page 6 5.
System
System is what connects everything - the computer, the data,
and the human operator - all working together to ask questions,
discover answers, and display them in ways that promote
understanding of what it means to live on the earth.
FromGIS in Schoolsby Richard Audet and Gail Ludwig - Page 6 6.
GPS combines three words: Global + Position + System 7. Global
Satellites broadcast the signals around the entire world so as
long as you are someplace outside without too much cloud cover,
your GPS unit should receive signals.
8. Global Position
Location (position) in the world (global) in three dimensions
(3-D):
Latitude LongitudeAltitude
9. Latitude
The angle north or south of the equatorial plane
Parallels lines of latitude that measure locations in the N-S
direction on the geographic coordinate system
10. Longitude
The angle east or west from the prime meridian
Meridians lines of longitude that measure locations in the E-W
direction on the geographic coordinate system
11. Altitude
The height above sea level on Earth
1524 m 2438 m 3505 m 4572 m 5486 m 6069 m 7620 m 9144 m 12.