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![Page 1: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/1.jpg)
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
![Page 2: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/2.jpg)
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
![Page 3: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/3.jpg)
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
![Page 4: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/4.jpg)
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
![Page 5: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/5.jpg)
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
![Page 6: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/6.jpg)
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
![Page 7: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/7.jpg)
Main Menu
![Page 8: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/8.jpg)
Open with vgroup
![Page 9: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/9.jpg)
List SDS and vdata Names
![Page 10: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/10.jpg)
Range Input Window
![Page 11: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/11.jpg)
Import Data
![Page 12: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/12.jpg)
Select Function Menu
![Page 13: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/13.jpg)
Geolocated Plot
![Page 14: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/14.jpg)
Daytime Total Filtered Radiance
![Page 15: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/15.jpg)
Show Subset Range
![Page 16: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/16.jpg)
Histogram of Scene ID
![Page 17: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/17.jpg)
Multivariable Plot
![Page 18: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/18.jpg)
Grid Contour Plot
![Page 19: View_hdf Kam-Pui Lee Science Applications International Corporation CERES Data Management Team Linda Hunt Computer Sciences Corporation Atmospheric Sciences.](https://reader031.fdocuments.net/reader031/viewer/2022013012/56649f295503460f94c42c11/html5/thumbnails/19.jpg)
Curve Fit