JHV User's Guide

Version 2.1


Contents:

  1. What It Is
  2. System Requirements
  3. Installing JHV
  4. Getting Started
  5. Using JHV

What It Is

The Java HDF Viewer (JHV) is a Java-based visualization tool for browsing NCSA Hierarchical Data Format (HDF) files. Opening an HDF file with the JHV lets you see all hierarchical components of any HDF file, and then view the data stored in each component. The JHV allows you to view the following HDF data objects: Scientific Datasets (up to 3 dimensions), Raster Images, Palettes, Vdata Tables, Vgroups, Attributes, and Annotations. The major features of the current JHV include: (i) Displaying file annotations and data attributes, (ii) Previewing large images and subsetting image area, (iii) Editing 2-D images and viewing image data or pixel values, (iv) Doing image animation for 8-bit raster images and 3-D data, (v) Making transparent images and overlaying 8-bit raster images, (vi) Creating spreadsheets from vdata tables or raster images, (vii) Showing distributions of image data or pixel values.

System Requirements

  • A Java 1.1 or above compatible VM, such as the JDK-1.1.3 from JavaSoft.
  • 24MB RAM recommended.

Platforms supported


Getting Started

1. Install Java if needed.

2. Install the HDF Java products if needed.

3. To run the JHV:

  1. Unix Set the environment:
    • CLASSPATH -- add the path to the NCSA JHI/JHV classes
    • LD_LIBRARY_PATH (where needed) -- add the path to the NCSA JHI/JHV libraries
    • PATH -- add the path to the NCSA JHI/JHV bin
    Start JHV by typing "jhv" at a command line prompt. You may optionally specify the file to open intially.

  2. Windows95/NT Create a ``shortcut'' if desired.

    Start "JHV" by double-clicking on the "shortcut" of the JHV. Or type "jhv" at "Dos command prompt".


HDF Group
NCSA

hdfhelp@ncsa.uiuc.edu