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view_hdf
Kam-Pui LeeScience Applications International Corporation
CERES Data Management Team
Linda HuntComputer Sciences Corporation
Atmospheric Sciences Data Center
NASA Langley Research Center
Atmospheric SciencesData Center
NASA LaRC
Introduction
• NASA Langley Research Center has developed the Clouds and the Earth’s Radiant Energy System (CERES) instrument to study the Earth’s climate and environment
• The CERES Data Management System has been developed to generate science data products from the instrument measurements
• This system is now operational at the Atmospheric Sciences Data Center (DAAC) producing archival data sets written in Hierarchical Data Format (HDF)
• A visualization and analysis tool, view_hdf, has been written in Research Systems’ Interactive Data Language (IDL) to access data from HDF products
Atmospheric SciencesData Center
NASA LaRC
view_hdf overview
• Consists of IDL routines and a C shared library, with a graphical user interface (GUI) to manipulate the data
• Developed on a Unix platform; built and tested on Solaris, Irix, HP-UX, and DEC/Compaq Alpha operating systems
• Currently being tested on PC platforms
• An IDL-only version is under development that eliminates the C shared library, making view_hdf portable to any system which can run IDL
• Developed for the CERES project but useful with other data sets written in HDF and HDF-EOS
Atmospheric SciencesData Center
NASA LaRC
Capabilities of view_hdf
• Select and subset variables from either Science Data Sets (SDS) or vdata structures
• Render both two- and three-dimensional graphics
• Plot geolocated data onto various world map projections
• Plot multiple variables
• Perform simple arithmetic operations on two variables
• Compute statistics
• Create subsets of data based on the value of another criterion variable
• Perform curve fitting and regression
• Create histograms
Atmospheric SciencesData Center
NASA LaRC
Capabilites of view_hdf
• Display data values to the screen
• Export data to a file in ASCII or HDF formats
• Save plots in PostScript or GIF format
• Send plots directly to a printer
• Execute a user-defined IDL procedure
Atmospheric SciencesData Center
NASA LaRC
Obtaining view_hdf
• view_hdf is distributed by the Atmospheric Sciences Data Center at NASA Langley:
http://eosweb.larc.nasa.gov
• support is available from
Science, User and Data Services
Atmospheric Sciences Data Center
NASA Langley Research Center
MS 157 D, 2 S. Wright St.
Hampton, VA 23681-2199
USA
e-mail: [email protected]
Phone: 757-864-8656 Fax: 757-864-8807
Atmospheric SciencesData Center
NASA LaRC
Main Menu
Open with vgroup
List SDS and vdata Names
Range Input Window
Import Data
Select Function Menu
Geolocated Plot
Daytime Total Filtered Radiance
Show Subset Range
Histogram of Scene ID
Multivariable Plot
Grid Contour Plot
Curve Fit