Sample screen shot showing SSM/I brightness temperatures and passive-microwave derived snow and sea ice extent. The images are coupled so that ROI defined in one image is also defined for other image and zoom window shows same area in both images. These grids are of the same resolution. In next version of the tool the grids can be different resolutions and still be coupled.
The Polar HDF-EOS Data Imaging and Subsetting (PHDIS) Tool
The Polar HDF-EOS Data Imaging
and Subsetting (PHDIS) Tool
Siri Jodha Singh Khalsa
Emergent Information Technologies, Inc.
National Snow and Ice Data Center,
University of Colorado
Genesis – ESDIS Prototype
Evaluate suitability of HDF-EOS for
data sets in polar projections
Convert sample NSIDC DAAC data
sets to HDF-EOS
Build tools to subset, subsample,
visualize and export data fields from
Realize the promise of HDFEOS
One tool to open, read, display and
subset any data set
Utilize geolocation metadata
Provide simple interface for
geographic subsetting, subsampling,
Be able to provide a single tool for all
polar gridded DAAC data sets
Heritage: AVHRR, SSM/I, TOVS
Future: MODIS, AMSR, GLAS
The Polar HDF-EOS Data Imaging
and Subsetting Tool
For any HDF-EOS file a user can:
examine data contents
visualize and compare the data fields
overlay lat/lon lines and/or coastlines
designate subregions for zooming in
on or displaying values
Select one or more file to examine
When one or more files have been selected the
Load Data Field(s) window is opened.
When data fields have been loaded, user returns
to this screen to View Image Data
Selecting Data to Load
from all selected
files are displayed
Clicking on a field
name loads it.
Displaying a Data Field
Selected fields are grouped by projection.
Clicking on a row will open a window containing
the first field in that projection.
User may replicate the window or toggle through
the images in the default window
Data displayed with
gray scale palette.
Mode menu changes
Define zoom box
User first selects
one or more files
Metadata is read and
displayed. User then
selects field(s) to load.
Table of values includes
location and size of selected
Double clicking in a box
brings up this menu.
(Print and Write to File
will be added.)
Image Data” brings
up window from
which user selects
field to visualize.
Top level window is scaled to fit
user’s display while showing
entire data array. User can load
multiple fields and toggle
Instructions for defining
between them or display them a
in newregion of interest (ROI) in
any visualization window.
Box parameters displayed
while user positions box.
Multiple ROI boxes can be
visualized in new window and
can be displayed in a table.
Image with Legend
Includes palette and a thumbnail image
locating the current window in overall
array if zoomed.
New Features to be Added
Coupled images from different grids.
Coastline and graticule overlay in
Autoreplicate for 3 or less fields.
View Core and Structural metadata.
Mapping between table cell and
Read and display swath data.
HDF-EOS enables discipline-specific
tools to be developed
Polar HDF-EOS Website created