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Source: http://hdfeos.org/workshops/ws04/presentations/Khalsa/Khalsa_PHDIS.ppt
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1
The Polar HDF-EOS Data Imaging and Subsetting (PHDIS) Tool
Siri Jodha Singh KhalsaEmergent Information Technologies, Inc.
National Snow and Ice Data Center,
University of Colorado
HDF_EOS IV 19.9.2000
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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 multiple products
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Realize the promise of HDF-EOS
One tool to open, read, display and subset any data set
Utilize geolocation metadata Provide simple interface for
geographic subsetting, subsampling, and export
HDF_EOS IV 19.9.2000
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DAAC Perspective
Be able to provide a single tool for all polar gridded DAAC data sets• Heritage: AVHRR, SSM/I, TOVS• Future: MODIS, AMSR, GLAS
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Demonstration
The Polar HDF-EOS Data Imaging and Subsetting Tool• IDL-based (multi-platform)
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
Opening Window
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
Available fields from all selected files are displayed along with projection information.
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
Initial Display
Data displayed with gray scale palette.
Mode menu changes click action• Toggle images• Define zoom box• Browse: select
between multiple zoom boxes.
Metadata is read and displayed. User then
selects field(s) to load.
User first selects one or more files
to open.
Top level window is scaled to fit user’s display while showing entire data array. User can load multiple fields and toggle between them or display them in new windows.
Multiple ROI boxes can be registered. Contents visualized in new window and can be displayed in a table.
Instructions for defining a region of interest (ROI) in any visualization window. Box parameters displayed while user positions box.
Table of values includes location and size of selected region.
Selecting “View Image Data” brings
up window from which user selects field to visualize.
Double clicking in a box brings up this menu. (Print and Write to File will be added.)
Image with Legend
Includes palette and a thumbnail image locating the current window in overall array if zoomed.
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New Features to be Added
Coupled images from different grids. Coastline and graticule overlay in
zoom window. Autoreplicate for 3 or less fields. View Core and Structural metadata. Mapping between table cell and
image pixel Read and display swath data.
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Conclusions
HDF-EOS enables discipline-specific tools to be developed
Polar HDF-EOS Website created• http://nsidc.org/PROJECTS/HDFEOS