111211 foss4g nagoya_presentation2

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111211 foss4g nagoya_presentation2

  1. 1. FOSS4G (GRASS R GMT) Takayuki NUIMURA 11th Dec. 2011Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 1 / 15
  2. 2. Outline 1 2 Step 1: GDAL DEM Step 2: GRASS GPS DEM Step 3: Octave RS-DEM Step 4: R RS-DEMs 3 R ( ) GMT ( )Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 2 / 15
  3. 3. FOSS4G FLOSS1 FLOSS FOSS4G データ処理&図化 (GDAL, GRASS, R, Octave) 空間データ図化 (GMT) グラフィック処理 (Inkscape, GIMP) プレゼンテーション (LaTeX Beamer) Beamer 1 Free/Libre and Open Source SoftwareTakayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 3 / 15
  4. 4. (ex. AX010 ) =⇒Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 4 / 15
  5. 5. N Everest 28˚00 [m] 30˚ China 8000 7000 Ne 27˚50 pa Khumbu Himal 6000 l 5000 4000 Kathmandu 3000 27˚40 2000 1000 25˚ India 0 10 km 27˚30 80˚ 90˚ 86˚30 86˚40 86˚50 87˚00 85˚Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 5 / 15
  6. 6. 2007 ( ) N28˚00 Everest DEM [ m a.s.l ] GPS 6000 ( 3800 – 5500 m a.s.l.) 5000 400027˚50 Base station Peak China (Nuimura et al., J. Glaciol., in revise) Ne p 3000 al km 0 5 10 India 86˚30 86˚40 86˚50 87˚00 Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 6 / 15
  7. 7. 1 GDAL DEM HDF=⇒GeoTIFF 2 GRASS GPS =⇒GeoTIFF 3 Octave RS-DEMs (1992–2008) GPS-DEM 4 R RS-DEMs (m a−1 : 1992–2008)Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 7 / 15
  8. 8. Step 1: GDAL DEM GDAL HDF2 =⇒GeoTIFF gdal_translate (sds ) # EHdr ( ) gdal_translate -sds -of “EHdr” HDF Ehdr # GeoTIFF gdal_translate -of “Gtiff” Ehdr GeoTIFF gdal_translate ( ) 2 ERSDAC ASTER HDFTakayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 8 / 15
  9. 9. Step 2: GRASS GPS DEM GRASS GIS v.surf.rst 1 v.in.ogr GRASS 2 v.surf.rst =⇒ 3 r.out.gdal GRASS GeoTIFFTakayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 9 / 15
  10. 10. Step 3: Octave RS-DEM Octave RS-DEMs GPS-DEM Step 1: Step 2:Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 10 / 15
  11. 11. Step 4: R RS-DEMs R rgdal rgdal GIS readOGR readGDAL writeOGR writeGDAL readGDAL GeoTIFF DEM writeGDAL GeoTIFFTakayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 11 / 15
  12. 12. Step 4: R RS-DEMs 1992–2008 DEM ( ) =⇒ ( or )Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 12 / 15
  13. 13. Step 4: R RS-DEMs 1 readGDAL 1992–2008 DEM R 2 lm lm (m a−1 ) 3 writeGDAL GeoTIFFTakayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 13 / 15
  14. 14. R ( ) DEM 7000 6500 6000 Elevation (m) 5500 5000 4500 Debris−free Debris−free a) b) 4000 Debris−covered Debris−covered −3 −2 −1 0 1 2 3 0 5 10 15 20 Elevation change (m a−1) Area (km2) 50 m (m a−1 ) R plotCITakayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 14 / 15
  15. 15. GMT ( ) GDAL GeoTIFF=⇒NetCDF3 GMT 4 grdmath NoDATA 3 GMT 4Takayuki NUIMURA ( ) FOSS4G 11th Dec. 2011 15 / 15

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