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IDL Support of HDF

IDL Support of HDF. Tad Scheiblich RSI December 2, 2005. What is IDL?. Interactive Data Language Extensive Cross-Platform Libraries: Interactive Visualization Data Processing Scientific File Formats GUI Development. History & Background. 28 year history with NCAR & NASA

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IDL Support of HDF

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  1. IDL Support of HDF Tad Scheiblich RSI December 2, 2005

  2. What is IDL? Interactive Data Language • Extensive Cross-Platform Libraries: • Interactive Visualization • Data Processing • Scientific File Formats • GUI Development

  3. History & Background • 28 year history with NCAR & NASA • Extensively used at NOAA • Based in Boulder, CO • Offices Worldwide • Currently on version 6.2

  4. History with HDF • HDF Support Introduced in IDL 4.0 • HDF5 Support Added in IDL 5.6

  5. The HDF Libraries • Thin-Wrappers to Native C Libraries • HDF5 1.6.3 • HDF 4.1r5 ; create HDF5 file file = 'hdf5_out.h5' fid = H5F_CREATE(file) ; create some data data = hanning(100,200) ; create a datatype datatype_id = H5T_IDL_CREATE(data) ; create a dataspace, allow the dataspace to be extendable dataspace_id = $ H5S_CREATE_SIMPLE([100,100],max_dimensions=[200,200]) ; create the dataset dataset_id = $ H5D_CREATE(fid,'Hanning',datatype_id,dataspace_id, $ chunk_dimensions=[20,20]) ; extend the size of the dataset to fit the data H5D_EXTEND,dataset_id,size(data,/dimensions) ; write the data to the dataset H5D_WRITE,dataset_id,data

  6. Why IDL? • Interpreted language – easier to use • Interactive • Still very performant • Incredible visualization capabilities • Vast data processing library

  7. HDF5 Enhancements in IDL 6.3 • Opaque Data Support • Variable Length Data Support • Enumerated Data Support • Compound Data Support

  8. Other Features of Interest • Virtual Machine • iTools Interactive Data Analysis • netCDF Support • Cluster Computing API • MPI • Task-Farming • Connectivity Bridges • C/C++, Fortran(Dynamically LinkedModules) • Java • COM/ActiveX

  9. For More Information http://www.RSInc.com/IDL (303) 786-9900 Thank You! -Tad Scheiblich

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