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The HDFView is a Java-based tool for browsing and editing HDF4 and HDF5 files.
HDFView allows users to browse through any HDF4 and HDF5 file, starting with
a tree view of all top-level objects in an HDF file's hierarchy. HDFView allows
a user to descend through the hierarchy and navigate among the file's data objects.
The content of a data object is loaded only when the object is selected, providing
interactive and efficient access to HDF4 and HDF5 files. HDFView editing features
allow a user to create, delete, and modify the value of HDF objects and attributes.
The HDFView graphical user interface (GUI) is simple and easy-to-use. First, HDFView was implemented by using
the JavaTM 2 Platform, which is machine-independent. The
GUI components have the same look-and-feel for all machines. Second, HDFView uses
conventional folders and icons to display groups and datasets in a tree structure.
Users can easily expand or collapse folders to navigate the hierarchical structure
of an HDF file. Third, HDFView shows data content as text (table or plain text) or
as image.
1.2 About This Release
This release includes bug fixes, new features,a test suite, and improved documentation.
This release was built and tested with HDF 4.2.5 and HDF5-1.8.4 Patch 1 with HDF5 1.6 compatibility
flag. For information on new features in HDF5 Release 1.8.0 and format compatibility considerations,
please visit
http://www.hdfgroup.org/HDF5/doc/ADGuide/CompatFormat180.html.
Platforms
This release was built and tested for the following platforms:
32-bit distribution -- runs on 32-bit systems or 64-bit systems with 32-bit JRE
Linux
Mac Intel
Solaris
Windows
64-bit distribution -- runs on 64-bit systems with 64-bit JRE
Linux x86_64
Linux ia64
Mac Intel
Solaris 64-bit
Major Improvements
Built on HDF5 1.8.4 Patch 1 library and HDF 4.2.5 library.
Fix memory leak in the HDF-Java native.
Add H5.getOpenIDCount() and H5. getOpenID() to track any open IDs.
These functions can be very useful for checking memory leak for applications.
Add features to show data pointed to by object references or region references.
Find/search dataset from HDFView.
Add user option to open a file directly with read-only mode.
Show unsigned 64-bit integer.
Support netcdf3 files for the NETCDF module (ncsa.hdf.object.nc2.NC2File).
Major Bug Fixes
HDFView: Incorrectly displays data-type: character array
HDFView: if change palette then flip image, original colorscale is used
Local version of HDFView doc has broken links etc.
HDView: indices changed between 2.3 and 2.4. Why?
HDFView does not show preceding spaces for attribute values that begin with spaces
HDFView uses incorrect image values
HDFView: "Show Value" is always 0 if show image for 32-bit unsigned array
HDF4 object package failed on reading data
Incorrect Size of variable length dataset
Problem on import/export strings in compound datasets in HDFView
HDFView doc does not mention can save to PNG, GIF, BMP
HDFView: rainbow palette selection is different depending on where it is selected
Remove HDFCDataTypes from web page
HDFView: can't view contents of group if has same name as file
HDFView - Get error if open a compound dataset with string and reference
H5Sselect_hyperslab parameter order in header comment is wrong
High dim label is wrong
16-bit and 32-bit images do not scale properly if set range
Use better memory allocation in HDF4 JNI to avoid crash on OutOfMemory error on large dataset.
Show some HDF-EOS attributes stored in HDF4 vdata.
Fix a problem of displaying information for HDF4 vdata without name.
Add HDF-Java logging levels to HDF5 JNI and set default level to "SEVERE".
1.3 Features
This version fixed bugs from previous versions and added a few new and
enhanced features. It is a continuous work from the previous versions of HDFView. Some of
the major features from previous versions include replaceable I/O and GUI modules,
memory leak fixes, enhanced documentation, and test suite.
This version is user-configurable to support HDF4 or HDF5 or both. Users
can choose HDFView features to support HDF4 or HDF5 or both when installing
HDFView or compiling from the source code.
The following is a list of the browsing and editing features of HDFView. Details
of the features are discussed in their related chapters.
1.3.1 Browsing Features
Plugable GUI modules
Tree Viewer
Table Viewer
Image Viewer
Text Viewer
Metadata Viewer
Palette Viewer
Supported file formats
HDF4
HDF5
netCDF (read only)
FITS (read only)
Tree view of file structure
Supports drag-and-drop files to HDFView
Displays file hierarchy in a tree and allows users to navigate among the file's data objects
Adds options to show dataset as an image, a table or text
Allows users to select a subset of dataset to display
Shows attributes and other general information of data objects
Supports large fonts in GUI components
Adds -geometry switch to set the window size and location
Table view of file content
Be able to show large dataset (e.g. 1,000,000 x 100); very fast in table viewer
Displays simple compound dataset (simple or nested) in table
Allows users to select fields/members of VData/compound dataset to display
Provides slider bar for modifying image threshold range
Filters "fill value" in Image Viewer
Shows actual palette that results from palette manipulation
Supports large number of 8kx8k 3-D images by reuse the memory data buffer
Incorporates Mouse Grab/Move to browse an image
Text view of file content
Displays HDF5 user block in text, octal, hex, etc.
Provides option to show char dataset as text
Shows text attributes and text dataset in selected fonts (type and size)
Shows file information, such as file size and total number of datasets
1.3.2 Editing Features
Convert JPEG, GIF, PNG, and BMP images to HDF5 or HDF4
Save HDF4 or HDF5 images to JPEG, GIF, PNG, and BMP images
Writes variable length string data
Adds/deletes/renames datasets and groups
Edits content of datasets
Copies/pastes object in the same file or dross files of the same file format
Exports dataset values to an ASCII text file
Saves an HDF4/HDF5 image to a JPEG file
Adds/deletes/modifies attributes
Converts a JPEG image file into an HDF4/HDF5 file
Imports data values from a text file
Adds and modifies user blocks
1.4 Limitations / Known Problems
The current implementation of HDFView has the following limitations:
HDFView does not support undo operations; all changes will go to the physical file, and the editing results cannot be recovered.
Deleting object/attribute in HDF4 is not supported.
HDFView does not support conversion between HDF4 and HDF5.
HDFView supports only indexed image with RGB color model or 24-bit true color image. It does not support other color models such as CMYK and HSV.
HDFView cannot modify compressed HDF4 SDS if rank is greater than 2
because the existing compression algorithms supported by HDF do not
allow partial modification to a compressed datastream.
HDFView cannot modify HDF4 vdata. HDF4 only writes vdata by
records while hdf-java reads data by vdata fields since hdf-java
does not support data structure of vdata record.
Writing nested compound data of HDF5 is limited to some
simple cases. HDFView does not write complex compound data.