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HDF5 Tools in

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carlo
7 diapositives · 213 Views · Oct 09, 2014

Discover the capabilities of the Interactive Data Language (IDL) by Dr. Christopher Torrence, Senior Software Engineer. IDL is designed for comprehensive data analysis, visualization, and cross-platform application development. With HDF5 integration, users can efficiently read and query diverse data formats. Gain access to built-in routines for image processing and statistical analysis, alongside advanced object-oriented programming features. This toolkit includes essential functions for quick analysis and handling complex data structures, enhancing your research and commercial projects.

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  1. HDF5 Tools in Dr. Christopher Torrence Senior Software Engineer

  2. IDL The Interactive Data Language is the ideal software for data analysis, visualization, and cross-platform application development. IDL combines all of the tools you need for "quick-look" interactive analysis or large-scale commercial projects. • Interpreted vector-based language • Built-in image processing, multi-threaded math, statistics, and analysis routines • Object-oriented programming • Read/write data formats such as PNG, JPEG, TIFF, DICOM, MrSID, HDF/HDF-EOS, NetCDF, XML • Call from/to C/C++, FORTRAN, Java (with ION), ActiveX

  3. The IDL HDF5 Module • Set of built-in IDL routines that provide access to the underlying HDF5 C library (version 1.4.3). • Free with IDL5.6. • All read and query routines except H5P. • Routine names match the HDF5 C names, with an underscore, e.g. H5F_OPEN • Handles all HDF5 datatypes (including COMPOUND) except OPAQUE and VLEN; automatic conversion to IDL type • Limitations: No write capability No high-level HDF5 API

  4. HDF5 Code Example file_id = H5F_OPEN('hdf5_test.h5') dataset_id1 = H5D_OPEN(file_id, '/images/Eskimo') dataset_id2 = H5D_OPEN(file_id, '/images/Eskimo_palette') space_id = H5D_GET_SPACE(dataset_id1) dims = H5S_GET_SIMPLE_EXTENT_DIMS(space_id) image = H5D_READ(dataset_id1) rgb = H5D_READ(dataset_id2) H5S_CLOSE, space_id H5D_CLOSE, dataset_id1 H5D_CLOSE, dataset_id2 H5F_CLOSE, file_id DEVICE, decomposed=0 WINDOW,xsize=dims[0],ysize=dims[1] TVLCT, rgb[0,*], rgb[1,*], rgb[2,*] TV, image, /ORDER

  5. High-level HDF5 Parser The H5_PARSE function automatically parses an entire HDF5 file, or a group within a file, and returns a nested IDL structure. IDL> struc=H5_PARSE('hdf5_test.h5',/READ_DATA) IDL> help, struc, /structure IDL> help, struc.images.eskimo._data Returns an IDL structure with tag names such as: _NAME ‘hdf5_test.h5’ _TYPE ‘GROUP’ _PATH ‘/’ _COMMENT ‘This is a comment’

  6. The HDF5 Graphical Browser Uses H5_PARSE Tree view Preview window Import to IDL main level Creates IDL structure Standalone or as “open” dialog

  7. LAPACK linear algebra package.Linear equations, eigensystems, singular value decomposition, linear least-squares DIAG_MATRIX, MATRIX_POWER, PRODUCT Complex gamma, beta, and error functions MEDIAN Dimension keyword Stride for array subscripts New widgets: tree view, tab view, combo boxes, tooltips, toggle buttons Support for 64-bit IBM AIX, SGI Irix, HP-UX Support for MacOS X USGS General Cartographic Transformation Package (GCTP) Map transform functions HDF5 library read & query HDF4.1r5 and HDF-EOS 2.8 XML parser ITIFF support Contour object labels What’s New in IDL5.6 Download IDL5.6 & the HDF5 library from http://www.rsinc.com Visit us at booth #104 in the Exhibit Hall!