Maps4 finland 28.8.2012, pekka sarkola
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Maps4 finland 28.8.2012, pekka sarkola

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Maps4 finland 28.8.2012, pekka sarkola Maps4 finland 28.8.2012, pekka sarkola Presentation Transcript

  • Understanding  and  processing   geodata  with  Quantum  GIS   Pekka  Sarkola     Gispo  Oy  
  • Gispo  Oy  We  help  customers  to  take  advantage  of  the  FOSS4G   (Free  and  Open  Source  So;ware  for  Geospa=al)   so;ware  and  open  data.    We  support  the  development  and  u=lisa=on  of  open   source  so;ware  and  open  data.  
  • GIS  in  5  minutes  GIS  =  Geographic  Informa?on  System  
  • Data  representa?on  •  Representa?on  of  real  objects  •  Abstrac?on  to     –  Discrete  objects,  like  house   –  Con?nuous  fields,  like  rainfall  amount  or  eleva?on  •  ”60-­‐80%  of  all  informa=on  has  loca=on”  •  Can  only  physical,  real  objects  has  loca?on?   –  Email   –  Money  in  bank  account  
  • Geographic  informa?on  data  •  Raster   –  Image  •  Vector   –  Point   +  ANributes:     –  Polyline   name,  id,  type…   –  Polygon  
  • Collect  Share   Model   Visualise   Analyse  
  • What’s  not  GIS?  •  CAD   –  Computer-­‐aided  Drawning   –  Be  aware  about:  DXF,  DWG,  …  •  Google  Maps   –  Points-­‐on-­‐the-­‐map  
  • Map  projec?ons  •  Always  distor?on  of   –  Area   –  Shape   –  Direc?on   –  Bearing   –  Distance   –  Scale  
  • Coordinate  systems  •  You  use  already  defined  coordinate  systems   –  …or  do  your  own  coordinate  system  •  Roughly  2000  –  3000  different  coordinate  systems  •  Web  Nerd  Shortcut  (WNS):   –  ”I  just  use  GPS  coordinates”    •  GIS  Expert  Answer  (GEA):   –  ”So,  you  will  use  WGS84.  Like  La?tude  /  Longitude.   How  do  you  calculate  distance  between  two  points?”  
  • Map  Projec?on  •  WNS:  ”I  will  use  Google  Web  Mercator  on  my  data   visualisa?on”  •  GEA:  ”Right:”  
  • Geodata  File  formats  
  • Geodata  File  Formats  •  WMS:  ”I  will  use  SVG/XML/KML  in  my  app…”  •  GEA:  ”As  you  want,  but…”   –  Size  of  files:  XML  is  preNy  big   –  Features:  KML  includes  presenta?on   –  Data  inside  SVG?  
  • Using  Quantum  GIS  
  • Why  Quantum  GIS?  •  Some?mes  you  have  to:   –  View,  analyze,  convert,  manipulate  or  do  something   else  with  your  geodata  •  Quantum  GIS  is  easy  to  use,  free  open  source   sojware  for  Linux,  Mac  and  Windows  plakorms  •  More  info  and  download:   –  hNp://www.qgis.org/  
  • Live-­‐demo  
  • Where  I  can  learn  more?  •  Open  Knowledge  Fes?val,  17.-­‐22.9.2012   –  Open  Geodata  Hackathon  and  all  other  Open  *  things   –  www.okfes?val.org  •  Paikka?etomarkkinat,  6.-­‐7.11.2012   –  Annual  GIS  event  in  Finland   –  www.paikka?etomarkkinat.fi  
  • Or  just  contact  me!   Ques%ons?   Thank  you!   posiki  Presenta?on  includes  maps  from:    ©  Na?onal  Land  Survey  of  Finland,  data  extract  05/2012