gis & remote sensing


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introduction to gis&remote snsing.

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gis & remote sensing

  2. 2. Outlines• Remote sensing• GIS 2
  3. 3. Remote sensing• Remote sensing is the collection of information about an object without being in direct physical contact with the object.• The processes of collecting information about Earth surfaces and phenomena using sensors not in physical contact with the surfaces and phenomena of interest. 3
  4. 4. Some remote sensers Remote Sensing & GIS Applications Directorate
  5. 5. Steps in remote sensing• A – Source• B - Atmospheric interaction• C – Target• D – Sensor• E - Receiving unit:• F - Processing unit• G - Information system• H – Information
  6. 6. Steps in remote sensing
  7. 7. • Types of remote sensing Based on source of energytypesPassive sensors•Landsat•ASTER•Quickbard•IkonosActive Sensors•LIDAR•RADAR
  8. 8.  Optical remote sensing. Thermal remote sensing. Micro wave remote sensing.
  9. 9. Optical remote sensing In optical remote sensing , the sensors can only record the radiation in visible bands, near infrared and short wave infrared bands. Depending on the number of spectral bands used, optical remote sensing can be classified into following divisions: 1. Multispectral imaging system 2.Superspectral Imaging Systems
  10. 10. Thermal remote sensingThermal infrared radiation refers to electromagnetic waves with a wavelength of between 3.5 and 20 micrometers.Nowadays, both multi- and hyperspectral thermal sensors are used
  11. 11.  1 mm to 1 m of electromagnetic spectrum Microwave sensing encompasses both active and passive forms of remote sensing Longer wavelength microwave radiation can penetrate through cloud cover, haze, dust, and all but the heaviest
  12. 12. Platforms Platforms are: •Ground based •Airborne •Spaceborne Sensing from 1 meter to 36,000 km height 15
  13. 13. Aerial Camera Multispectral Satellite Radar Satellite Hyperspectral Sensor Landsat/Ikonos/Quickbard Hyperion 16
  14. 14. Application of Remotesensing  Urbanization & Transportation ◦ Updating road maps ◦ Asphalt conditions ◦ Wetland delineation • Agriculture – Crop health analysis – Precision agriculture – Compliance mapping – Yield estimation 17
  15. 15.  Natural Resource Management ◦ Habitat analysis ◦ Environmental assessment ◦ Pest/disease outbreaks ◦ Impervious surface mapping ◦ Lake monitoring ◦ Hydrology ◦ Landuse-Landcover monitoring ◦ Mineral province ◦ Geomorphology ◦ Geology• National Security -Targeting - Disaster mapping and monitoring -Damage assessment -Weapons monitoring -Homeland security -Navigation -Policy 18
  16. 16. GIS (GEO GRAPHICAL INFORMATIONSYSTEM) Geographic Information System (GIS) is a computer based information system A system for capturing, storing, checking, integrating, manipulating, analysing and displaying data which are spatially referenced to the Earth.
  17. 17. What GIS Does ? Mapping and *cartography Query Select Distance: Buffers Overlay Clip Merge Raster analysis 3D Continued….
  18. 18. Techniques used in GIS Relating info. from different sources Data capture Data integration Projection and registration Data structures Data modeling
  19. 19. Advantages GIS• Can cope with larger amounts of data• Can cover large study areas (the whole world if necessary)• Can cope with unlimited and frequent edits and changes• More robust and resistant to damage• Faster and more efficient• Requires less person time and money
  20. 20. THANK‘Q’