HDF Explorer is a data visualization program that reads Hierarchical Data Format files (HDF, HDF-EOS and HDF5) and also netCDF data files. HDF Explorer offers a simple yet powerful interface for the visualization of HDF data. The data is just a click of the mouse away. Data is first viewed in a tree-like interface, and then optionally loaded and visualized in a variety of ways. HDF Explorer features include fast access to data, grid, scalar and vector views. It also allows exporting your data either as a ASCII text file or a bitmap image.

1. HDF Explorer
HDF-EOS Workshop IX
San Francisco, CA
November 30 - December 2, 2005
Pedro Vicente Nunes
Space Research Software Inc.
Urbana, IL
HDF

2. HDF Explorer
• Version 1.4 just released
• New features: support for HDF5 Dimension
Scales
-2-
HDF

3. Dimension Scales : HDF5 API
C code
• Example: I have an array of 12 elements
organized in a 3 X 4 matrix
-3-
HDF

4. Dimension Scales : HDF5 API
C code
• But the spatial phenomenon I am trying to model
has different width and height definitions
X
Y
-4-
HDF

5. Dimension Scales : HDF5 API
C code
My array data of 12 elements:
int dset_data[12] = {1,2,3,4,5,6,7,8,9,10,11,12};
My X axis spatial domain:
int X[4] = {10,20,50,100};
My Y axis spatial domain:
int Y[3] = {10,20,30};
-5-
HDF

6. Dimension Scales : HDF5 API
C code
Save my arrays as HDF5 datasets with the High
Level HDF5 API function
H5LTmake_dataset_int
(fid,“My data",rank,dims, dset_data);
-6-
HDF

7. Dimension Scales : HDF5 API
C code
for the X and Y arrays
H5LTmake_dataset_int
(fid,“X axis",rankx,dimsx, X);
H5LTmake_dataset_int
(fid,“Y axis",ranky,dimsy, Y);
-7-
HDF

8. Dimension Scales : HDF5 API
Call H5DSattach_scale function
/* get the DS dataset id and dataset*/
did = H5Dopen(fid,” My data”);
dsid = H5Dopen(fid,” X axis”);
/* attach the “ X axis” dimension scale to
“My data" at dimension 0 */
H5DSattach_scale(did,dsid,DIM0);
-8-
HDF

9. Dimension Scales : HDF5 API
Call H5DSattach_scale function
/* get the DS dataset id and dataset*/
did = H5Dopen(fid,” My data”);
dsid = H5Dopen(fid,” X axis”);
/* attach the “ X axis” dimension scale to
“My data" at dimension 0 */
H5DSattach_scale(did,dsid,DIM0);
-9-
HDF

10. HDF Explorer: Tree View
- 10 -
HDF

11. HDF Explorer: Grid View
- 11 -
HDF

12. HDF Explorer: Map View
- 12 -
HDF