MATLAB Programming

7 Working with Scientific Data Formats
Once you specify the dimension or field, you use Min and Max to specify
the range of values that you want to import. For dimensions, Min and Max
represent a range of elements. For fields, Min and Max represent a range
of values.
HDF Raster Image Data
For 8-bit HDF raster image data, you can specify the colormap.
Using the MATLAB HDF4 High-Level Functions
To import data from an HDF or HDF-EOS file, you can use the MATLAB
HDF4 high-level function hdfread. The hdfread function provides a
programmatic way to import data from an HDF4 or HDF-EOS file that still
hides many of the details that you need to know if you use the low-level HDF
functions, described in “Using the HDF4 Low-Level Functions” on page 7-55.
You can also import HDF4 data using an interactive GUI, described in “Using
the HDF Import Tool” on page 7-35.
This section describes these high-level MATLAB HDF functions, including
• “Using hdfinfo to Get Information About an HDF4 File” on page 7-52
• “Using hdfread to Import Data from an HDF4 File” on page 7-53
To export data to an HDF4 file, you must use the MATLAB HDF4 low-level
functions.
Using hdfinfo to Get Information About an HDF4 File
To get information about the contents of an HDF4 file, use the hdfinfo
function. The hdfinfo function returns a structure that contains information
aboutthefileandthedatainthefile.
Note You can also use the HDF Import Tool to get information about the
contents of an HDF4 file. See “Using the HDF Import Tool” on page 7-35
for more information.
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