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An Introduction to the IRI Data Library

An Introduction to the IRI Data Library. Michael Bell. Objectives. Become familiar with the organization of the Data Library Learn how to find datasets and select spatial and temporal domains See how to perform simple arithmetic analyses See how to create customized maps and graphs

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An Introduction to the IRI Data Library

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  1. An Introduction to the IRI Data Library Michael Bell

  2. Objectives • Become familiar with the organization of the Data Library • Learn how to find datasets and select spatial and temporal domains • See how to perform simple arithmetic analyses • See how to create customized maps and graphs • Learn how to download data and images • Understand how the Data Library is related to the IRI Map Room

  3. Structure of Course • Introduction to the organization and primary tools of the Data Library • Group examples • Individual examples

  4. The IRI Data Library is a… • Data repository • >300 datasets covering all aspects of climate-related characteristics • Data analysis tool • Arithmetic operations  EOF analysis • Data visualization tool • Time series, maps, cross-sections • Data download resource • Free access to text, binary, GIS-compatible, etc. data files http://iridl.ldeo.columbia.edu

  5. Data Library Home Page

  6. Finding Datasets

  7. Structure of Datasets -Primary Organization -Dataset -Dataset -Variables -Dataset -Variables -Dataset -Variables -Primary Organization . . . . -NASA -ERBE (Earth Radiation Budget Experiment) -Datasets by instrument -Variables -GES-DAAC (Distributed Active Archive Center) - -GISS -LeGrande_Schmidt2006 (authors) -GPCP (Global Precip Climatology Project) -Datasets by version -Datasets by instrument -Variables . . . . Example

  8. Data Browse/Search Map Room Search

  9. Dataset Page Contents and StructureGridded Datasets

  10. Function Bar -Access to data manipulation, visualization, download tools

  11. Documentation Access Points Source Bar -Navigational information -Where am I? What operations have I performed? -Documentation access

  12. Dataset and Variables -Access to variables or lower-level datasets

  13. Grids (Independent Variables) -Information about grids on which data is dependent -Latitude (Y) -Longitude (X) -Time (T) -Others (height/depth, ensemble member, etc.)

  14. Note new information -Selected variable shown in Source Bar -Datasets and variables heading gone -More information about variable below

  15. Important information about variable -Missing value indicator -Units

  16. Function Bar -Access to data manipulation, visualization, download tools View Links -Access data viewer

  17. Data Selection -Data domain selection

  18. Filters -Common data manipulation tools

  19. - Monthly Climatology/Anomaly • Average over any ind. variable • Root mean square • Find max/min values over any ind. variable

  20. Data Files -Access to data downloads

  21. Tables -Access to tabular data for Excel, etc.

  22. Expert mode -Manually enter Ingrid code

  23. Selecting Data DomainGridded Datasets

  24. Data Selection -Data domain selection

  25. Data Selection Step 1. Change text in Setting Ranges boxes using same syntax as text already there. Step 2. Click Restrict Ranges button. Step 3. When satisfied information in top box represents desired domain, click the Stop Selecting button.

  26. Example Time (T) 1 Oct 1996 to 31 Jan 1997 Latitude (Y) 60S to 60N Note: Center of nearest grid point automatically selected.

  27. Note: New data domain now represented in Source Bar and grid information.

  28. Visualizing Data: Making maps and graphs

  29. Redraw  Zoom To Full Help

  30. Change Time -Change text and redraw -Select button with adjacent date Make Animation -Enter range of dates (date1 “to” date2) and redraw

  31. Change Region -Click and drag box over area -Change lat/lon limits and redraw

  32. Change Color Scale Limits -Enter new limits and redraw

  33. Change Map Options -Use pull down menus to: -Change axis selection -Draw admin boundaries -Draw contours, etc. -Use Edit plot button to add more customizations

  34. Change Map Options -Select a new color scale -Add admin boundaries Return to Viewer -Click more options

  35. Download map -Select desired format for map and color scale

  36. Return to dataset page -To maintain domain selections from viewer, click data in view button. -To return without saving selections, click Entire Dataset link or dataset link at top of page.

  37. Downloading Data Files

  38. Download Data File Step 1. Select Data Files link. Step 2. Select link for desired format.

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