view_hdf
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The document describes view_hdf, a visualization and analysis tool developed in IDL to access data from HDF files produced by NASA's CERES instrument. View_hdf allows users to select and plot variables, perform arithmetic operations, calculate statistics, extract bits, and export data. It provides capabilities for 2D and 3D graphics, geolocated maps, histograms, and curve fitting. Contact information is provided for the Atmospheric Sciences Data Center which hosts view_hdf and the CERES data.
view_hdf
- 1. view_hdf Kam-Pui Lee and Peter Spence SAIC CERES Data Management Team Science Data Processing Workshop 2002 February 27-28, 2002
- 2. 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 by the Atmospheric Science Division to generate science data products from the instrument measurements • This system is now operational at the Langley Atmospheric Sciences Data Center (ASDC) producing archival data sets written in Hierarchical Data Format (HDF)
- 3. Introduction • A visualization and analysis tool (view_hdf) has been written in Interactive Data Language (IDL) to access data from HDF products • This tool is developed with graphical user interface (GUI) to manipulate the data • Although this tool is developed for CERES project, it is of general use with other data sets written in HDF
- 4. Capabilities of view_hdf • Select and subset variables from either Science Data Sets (SDS) or Vdata structures • Display vgroups • Render both two and three dimensional graphics • Plot geolocated data onto various world map projections • Plot multiple variables
- 5. Capabilities of view_hdf • Do simple arithmetic operation of two variables • Compute statistics • Create subset of data based on the range of another criterion variable • Do curve fit and regression • Do Histogram
- 6. Capabilities of view_hdf • Extract bits from data • Display data from the screen • Save plot in Postscript or GIF format • Send plot directly to a printer • Export data to an ASCII format or HDF file • Execute user defined IDL procedure
- 7. User’s Guide • The URL for the user’s guide of view_hdf is: http://asd-www.larc.nasa.gov/ceres/collected_guide/list.html • The URL for download view_hdf is: http://eosweb.larc.nasa.gov/HPDOCS/view_hdf.html
- 8. Contacts for Data Center/Data Access Information Science, User and Data Services Office Atmospheric Sciences Data Center NASA Langley Research Center Mail Stop 157D 2 South Wright Street Hampton, VA 23681-2199 USA Telephone: (757) 864-8656 FAX: (757) 864-8807 E-mail: larc@eos.nasa.gov URL: http://eosweb.larc.nasa.gov
- 9. Main Menu
- 10. Open with Vgroup
- 11. List SDS and Vdata Names
- 13. Import Data
- 15. Geolocated Plot
- 17. Multi Y Variables Plot
- 18. Multi X Variables Plot
- 19. Histogram of Scene ID
- 20. Curve Fit