Visualizing and Analyzing HDF-EOS5 and HDF5 data with NCL
 

Visualizing and Analyzing HDF-EOS5 and HDF5 data with NCL

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NCAR Command Language (NCL) is an interpreted language designed for sceintific data analysis and visualization with high quality graphics, espeially for atmospherice scince. NCL has been support ...

NCAR Command Language (NCL) is an interpreted language designed for sceintific data analysis and visualization with high quality graphics, espeially for atmospherice scince. NCL has been support NetCDF 3/4, GRIB 1/2, HDF-SDS, HDF_EOS, shapefiles, binary, and ASCII files for years. Now HDF-EOS5 is the released version, and HDF5 in beta-test stage.

Now NCL team are developing NCL to write HDF5 files, and to read HDF-EOS5 data with OPeNDAP.

NCL team will share with people their experience to visualize and analyze HDF-EOS5 and HDF5 data.

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Visualizing and Analyzing HDF-EOS5 and HDF5 data with NCL Visualizing and Analyzing HDF-EOS5 and HDF5 data with NCL Presentation Transcript

  • Visualizing and Analyzing of HDF-EOS and HDF data with NCL Wei Huang, Dave Brown, Mary Haley, Rick Brownrigg CISL/NCAR Dennis Shea, Adam Philips CGD/NCAR huangwei@ucar.edu
  • What is NCL ◦ NCL stands for NCAR Command Language  http://www.ncl.ucar.edu for more information ◦ NCL is developed at CISL/NCAR, for scientific data analysis and visualization ◦ Free available as binaries, open source ◦ Supports NetCDF (3 and 4), GRIB (1 and 2), HDF, HDF-EOS 2 and 5 (as Spring of 2010) ◦ Newly added HDF5 and OpenDap (in 2010) ◦ High quality graphics ◦ Lots of example scripts 02/17/14 CISL/NCAR
  • HDF-EOS5 Released April, 2010 HDF-EOS5 included NCL ◦ 5.2.0 released in April, 2010 ◦ 5.2.1 released in July, 2010 HDF, and HDF-EOS2/5 Examples ◦ http://www.ncl.ucar.edu/Applications/HDF.shtml ◦ Use “ncl_filedump” to check variables in HDF, and HDF-EOS2/5 files ◦ Use “ncl_convert2nc” to convert HDF-EOS2/5 and HDF files to NetCDF files 02/17/14 CISL/NCAR
  • HDF-EOS5 Sample 02/17/14 CISL/NCAR
  • HDF-EOS5 Sample (continue) 02/17/14 CISL/NCAR
  • HDF-EOS5 Sample (continue) Reflectivity of the ground pixel 02/17/14 CISL/NCAR
  • HDF5 in Beta Release 02/17/14 CISL/NCAR
  • Sample Script to Read HDF5  f = addfile(”./data/MOD13A2A.h5", "r”) ◦ printVarSummary(f)  grps = getfilegroups(f, "/", 0) ◦ print(grps)  grps2 = getfilegroups(f, "/MODIS_Grid_16DAY_1km_VI", 0) ◦ print(grps2)  v1 = f->1_km_16_days_red_reflectance ◦   printVarSummary(v1) vn = grps2(0)+"/1 km 16 days blue reflectance” v2 = f->$vn$ ◦ printVarSummary(v2) 02/17/14 CISL/NCAR
  • Group in HDF5 and Sample Script  f = addfile(”./data/NISESSMI.h5", "r") ◦ print(f)   gn = "/Northern Hemisphere” g1 = f=>$gn$ ◦ print(g1)   g2n = "/Northern Hemisphere/Data Fields” g2 = g1=>$g2n$ ◦ print(g2)   vn = "/Northern Hemisphere/Data Fields/Age" v1 = g1->$vn$ ◦ printVarSummary(v1)  v2 = g2->$vn$ ◦ printVarSummary(v2) 02/17/14 CISL/NCAR
  • HDF5 Sample Plot 02/17/14 CISL/NCAR
  • HDF5 Sample Plot (continue) 02/17/14 CISL/NCAR
  • HDF5 Sample Plot (continue) 02/17/14 CISL/NCAR
  • HDF5 Sample Plot (continue) 02/17/14 CISL/NCAR
  • Read Compound data from HDF5  fn = "K1VHR_23SEP2008_2330_L02_SST.h5”  f = addfile(fn, "r”) ◦ print(f)  lon1d = f->/SST/SST_Composite.Longitude  lat1d = f->/SST/SST_Composite.Latitude  sst1d = f->/SST/SST_Dataset.SST 02/17/14 CISL/NCAR
  • Print-out      filename: K1VHR_23SEP2008_2330_L02_SST file global attributes: dimensions: DIM_000 = 36381 variables:  group </PRODUCT_INFORMATION>  group </PRODUCT_METADATA>  group </PRODUCT_METADATA/PRODUCT_DETAILS>  group </PRODUCT_METADATA/PROJECTION_PARAMETERS>  group </SST>  compound <SST_Composite> (Latitude, Longitude, SST) (DIM_000)  compound <SST_Dataset> (Latitude, Longitude, SST) (DIM_000)  group </SST/GP_PARAM_INFO> 02/17/14 CISL/NCAR
  • 02/17/14 CISL/NCAR
  • HDF-EOS5 OpenDap Using liboc-dap-0.0.2 In Alpha Version 02/17/14 CISL/NCAR
  • HDF-EOS5 OpenDap -- a sample script     url = "http://acdisc.gsfc.nasa.gov/opendap/HDFEOS5/Aura_OMI_Level3/OMAEROe.003/2010/" filename = url + "OMI-Aura_L3-OMAEROe_2010m0712_v0032010m0714t203639.he5” f = addfile(filename,"r”) ◦ print(f) vis_aerosol = f->SingleScatteringAlbedoPassedThresholdMean ◦ printVarSummary(vis_aerosol)   lat = f->Latitude ◦ printVarSummary(lat) lon = f->Longitude ◦ printVarSummary(lon) 02/17/14 CISL/NCAR
  • HDF-EOS5 OpenDap –sample plot 02/17/14 CISL/NCAR
  • Conclusion HDF-EOS5 is already released ◦ 5.2.0 in April, 2010 ◦ 5.2.1 in July, 2010 HDF5 will be released soon ◦ Being tested with lots of data ◦ In Beta Version HDF-EOS5 OpenDap is on the way ◦ With limited test ◦ In Alpha Version 02/17/14 CISL/NCAR
  • Questions? Thank You! 02/17/14 CISL/NCAR
  • Write HDF5 with NCL Write HDF5 with Options: ◦ Compression  At File Level  At Variable Level ◦ Chunking  At File Level  At Variable Level 02/17/14 CISL/NCAR
  • Sample Script to Write HDF5 02/17/14 CISL/NCAR