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ITS488  –  Geographic  Informa5on  System

Teerayut  Horanont,  PhD  Sirindhorn  Interna5onal  Ins5tute  of  Technology  (SIIT)  Thammasat  University        E:  teerayut@siit.tu.ac.th  

5-­‐1  Let's  do  it:    Intro  to  QGIS  

Leaflet      a  JavaScript  library  for  mobile-­‐friendly  maps  

2014  09  09

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Today’s  Outline  

•  We  will  have  a  hands-­‐on  session  to  understand  how  to  manipulate  GIS  data  using  QGIS    (Quantum  GIS)  

•  Fun  with  you  first  map  applica5on  “leaflet”  a  JavaScript  library  for  mobile-­‐friendly  maps  

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Installa5on  QGIS    

h]ps://www.qgis.org/en/site/forusers/download.html  

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Requirements:  

•  GDAL  Complete  1.11  framework  package  •  NumPy  •  Matplotlib  

Then  •  QGIS  2.4.0-­‐1  

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Quicktool  

Toolbar  

Layer  control  

Status  bar  

Toolbox,    etc  

Map  view  

Add  and  display  data  

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Open  province.shp  

1    

2    

Iden5fy  features    

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1    

2    

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Explore  the  various  a]ributes  and  their  values.  

1    

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Which  province  that  the  total  area  is  larger  than  4000  sq.km.  and  name  end  as  “buri”?  

Q  

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A  

Please  save  the  result  as  new  shape  file  

Import  GIS  point  data  from  csv  file  

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1    

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ntsb_uniq_cell.csv    -­‐>  shape  file  

Spa5al  analysis  

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Assume  that  the  mobile  signal  coverage  is  about  6  km.  from  the  cell  site.    Please  draw  the  mobile  coverage  map  in  Chiang  Rai  province  

Q

Save  the  output  shapefile  

Do  you  know  6    km.  in  decimal  degree?  

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There  were  several  big  earthquakes  happen  in  Chiang  Rai  province  in  the  past  3-­‐4  months.      Find  the  area  in  Chiang  Rai  that  were  affected  by  the  earthquake  stronger  than  Magnitude  5  and  and  possible  out  of  the  mobile  phone  signal.        Assume  that  the  possible  damage  area  from  the  earthquake  (Mag  >  5)  is  30  km.  from  the  epicenter.    

Q

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Use:  eq_chiangrai_may_4above.csv  

Check  points  

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1)  Remove  the  created  layer.  2)  Go  to  your  working  folder,  see  how  many  files  QGIS  

generated  for  1  layer.  3)  Double  click  to  open  the  layer  again  4)  Did  you  remember  what  is  mandatory  for  

shapefile?    5)  Remove  2  files  and  double  click  to  open  again.  6)  Try  to  apply  the  layer  with  different  projec5on  and  

see  the  effect.  

Spa5al  analysis  ques5ons  

1.  Can  you  generate  a  region  map  from  the  given  province  map?  

2.  Can  you  count  how  many  mobile  cell  site  in  Chiang  Rai  province?      

3.  Open  the  transporta5on  network  file.  Can  you  clip  only  the  transpira5on  network  in  ChiangRai  province?  

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Open  for  ques5ons  

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