INTRODUCTORY UNIT: GEOGRAPHY AS A SCIENCE. MAPS AS THE MAIN TOOL IN GEOGRAPHY.
9. MAPS TODAY. COMPUTING OR DIGITAL MAPPING:
G.I.S. stands for GEOGRAPHIC INFORMATION SYSTEMS
DEFINITION: any information system that captures, manages, analizes and displays all forms of geographically referenced information.
- Resource management
- Environmental impact assessment
- Urban planning
G.P.S. stands for GLOBAL POSITIONING SYSTEM
DEFINITION: global navigation satellite system which provides reliable positioning, navigation and timing services to worldwide users on a continuous basis.
- Calculate and programme routes for planes, ships, cars and people.
DEFINITION: science or technique of acquiring information about the Earth's surface without being in contact with it.
SCIENTIFIC BASIS: all bodies emitte or reflect electromagnetic energy sensed and recorded in digital format by sensors installed on satellites.
- Weather forecast
- Coastal management
- Crop control
- Evaluate damages of natural disasters
10. WORKING WITH MAPS:
PROBLEMS WITH SCALE
Example: - map scale 1: 20,000,000
- real distance between London and Rome?
* Measure with a ruler the distance on the map: 8 cm.
* Multiply the distance measured on the map by the scale denominator:
10 cm x 20,000,000=100,000,000 cm.
* Change cm to km: 100,000,000 cm : 1000 km.