Geography Reference
In-Depth Information
Arctic Circle
12
60°
60°
ATLANTIC
OCEAN
40°
40°
20
PACIFIC
2 00
80
Tropic of Cancer
20°
80
OCEAN
INDIAN
Equator
OCEAN
200
ATLANTIC
20°
20°
20°
20°
20°
Tropic of Capricorn
OCEAN
40°
40°
40°
20°
40°
60°
100°
120°
140°
160°
60°
60°
60°
60°
SOUTHERN
OCEAN
Antarctic Circle
Google Earth as a quilt of remotely sensed images, taken
all over the world, coming from several sources, and sewn
together. As a result, the resolution (the measure of the
smallest object that can be resolved by the sensor, the
degree of detail) of the images (each piece of the quilt)
differs from place to place.
Remotely sensed images can be incorporated in a map,
and absolute locations can be studied over time by plotting
change in remotely sensed imagery over time. Advances in
computer technology and data storage, increasing accessibil-
ity to locationally based data and GPS technology, and soft-
ware corporations that tailor products to specifi c uses have all
driven incredible advances in geographic analysis based on
geographic information systems (GIS) over the last two
decades. Geographers use GIS to compare a variety of spatial
data by creating digitized representations of the environment
(Fig. 1.14), combining layers of spatial data, and creating
maps in which patterns and processes are superimposed.
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