LU 02 - 2.5 Map Information

LU 02 - 2.5 Map Information

1. LU 02 - 2.5.1 The nature of Geographic data

   • LU 02 - 2.5.1 The nature of Geographic data

2. LU 02 - 2.5.2 Representations of the Earth

   • Maps
     • Shows where things are located and represent geogrphic phenomena or situational context
     • Maps are scaled, two-dimentional represntations of the spherical Earth are ar reduced and distorted
     • Maps cannot show everything on Earths's surface with perfect accuracy and are therefore generalisations of reality
     • Maps serve as a universal geogrphic reference and communication tool
     • Information represented on a map is selected by the cartographer and is determined by the purpose of the map which is therefore a simplified representation of reality
     • Maps have elements
       • Data is represented by the elements on the map
         • to derive real world information from the map is through the following elements
           • legend area
           • Scale indicator
           • geographic grid
           • symbology
         • derive heights above sea level, gradients, characteristics of landforms and profiles is done through the following elements
           • contour lines
           • spot height indicators
           • trigonometric beacons

3. LU 02 - 2.5.3 Describing locations of places on Earth

   • Geographical grid/geographical coordinate system
     • The purpose of the Geographical Grid
     • Facts
       • Most important reference system to descripe location
       • Universally excepted
       • Used to determine time
       • where the Greenwich Meridian and the Equator intersect is 0°longitude and 0°latitude
       • This is how we answer the geographers WHERE question
     • Latitude (parallels) characteristics
     • Longitude (meridians) characteristics
     • The format of absolute location
       • There is 60 minutes (') in a degree ° and 60 seconds (") in a minute (')
       • Latitude varies between 0° (Equator) and 90° (the poles)
       • Longitude varies between 0° (Greenwich meridian) and180° (International Date Line)
       • xx°xx'xx"S/N;xx°xx'xx"E/W
     • how the geographic grid is used to determine universal time and date
       • Lines of longitude help us standardise time by creating time zones
       • 24 Time Zones (1 hour apart)
       • The date line determines the day of the year in the different halves of the globe, crossing this line mean you loose or gain a day (180° longitude)
   • Calculate/Determine Absolute location
     • LU 02 - 2.5.3 Describing locations of places on Earth
     • I did not understand this, do more work and caculations
   • Determining relative location

4. LU 02 - 2.5.4 Map Projections

5. LU 02 - 2.5.5 The Langauge of maps

6. LU 02 - 2.5.6 Map Scale

7. LU 02 - 2.5.7 Interpolation

8. LU 02 - 2.5.8 Remote sensing technology

9. LU 02 - 2.5.9 Geographic information systems