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ICESat/GLAS Status at NSIDC

ICESat/GLAS Status at NSIDC. Melinda Marquis NSIDC Product Team Lead, AMSR-E and GLAS GLAS Science Team Meeting Oct. 13-14, 2005. Outline. Progress (since last meeting, June 2-3, 2005) Ingested and started distributing Release-22 data Distribution stats Published Chris Shuman’s maps

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ICESat/GLAS Status at NSIDC

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  1. ICESat/GLAS Status at NSIDC Melinda Marquis NSIDC Product Team Lead, AMSR-E and GLAS GLAS Science Team Meeting Oct. 13-14, 2005

  2. Outline • Progress(since last meeting, June 2-3, 2005) • Ingested and started distributing Release-22 data • Distribution stats • Published Chris Shuman’s maps • Began subsetting • Began “BORG” table (Product-quality information about various ops periods) • Submitted Fall AGU abstract • Plans • Release 23 • Release 24 • DEM • FAQ about multiple releases for users’ benefit #21 GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  3. Release 22 Data • Release 22 Data: • GLA01, 03-05 (available July 21, 2005) • GLA02, 07-09 (available Aug. 22, 2005) • Temporal coverage: 2004-10-03 to 2004-11-08 (Laser 3A) GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  4. Various Releases: http://nsidc.org/data/icesat/data.html#release_schedule GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  5. Dist. Stats from start of mission (via Data Pool) GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  6. Dist. Stats from start of mission (via Gateway) GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  7. Dist. Stats from start of mission (via Gateway +Data Pool) Datatype Total files GLA01    62038 GLA02    4039 GLA03    616 GLA04    2100 GLA05    14408 GLA06    61150 GLA07    6209 GLA08    1648 GLA09    3302 GLA10    1679 GLA11    2251 GLA12    3700 GLA13    2105 GLA14    5743 GLA15    687 GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  8. User Affiliations: # of distinct users by user category through Sept. 30,05 user_type            Instances ECS OTHER               22 FOREIGN COMMERCIAL      8 FOREIGN GOVERNMENT      14 FOREIGN OTHER       35 FOREIGN UNIVERSITY      53 NASA                    21 OTHER                1 US COMMERCIAL        6 US FEDERAL GOVERNMENT    9 US GENERAL PUBLIC        1 US OTHER             5 US STATE/LOCAL GOVERNMENT       2 US UNIVERSITY       64 Total Result           241 Rebinned    Research  138                 Commercial 14    Govt    25         Other    64            Total    241            Foreign 110 Domestic 131 Total    241 GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  9. Published Chris Shuman’s maps • Data summaries page: • http://nsidc.org/data/icesat/data.html#lasers • One elevation map/ops period • We also made smaller, optimized images of Chris’ maps to serve from our web site (with links to the full-resolution versions from an ftp server). GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  10. Example: Laser 1 Elevations GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  11. Subsetter published July 25 http://nsidc.org/forms/glas_subset_form.html We provide subsetting for GLA01, 05-15. We’ve had 24 separate requests, from 18 distinct users. (4 users have made 2 requests; 1 users has made 3.) Within a given “request,” subsetting multiple data types (e.g., GLA06 and GLA12) or subsetting a given data sets into multiple regions is common. GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  12. Subsetting (cont.) GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  13. Subsetter: Data available for subsetting Data available for subsetting GLA01.018GLA01.019GLA01.022GLA05.019GLA05.022GLA06.018GLA06.021GLA07.019GLA07.022GLA08.019GLA08.022GLA09.019GLA09.022 GLA10.019GLA11.019GLA12.018GLA12.021GLA13.018GLA13.021GLA14.018GLA14.021GLA15.018GLA15.021 GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  14. “BORG” Table • Goal is to assimilate the most useful product-quality information, about the multiple operations periods, in one table. • Laser transmit energies for the two wavelengths • Laser footprint size and shape • Pointing accuracies • Geolocation accuracies • Publish this on NSIDC ICESat/GLAS web site. • Also to present as a poster at Fall AGU. • Dave Harding has provided lots of info. GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  15. BORG Table (cont.) GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  16. Borg Table (cont.) GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  17. AGU Abstract submitted Authors: Melinda, Dave H., Bob S., Jim Abshire, and the GLAS Instrument and Science Teams Title:     Ice, Cloud, and land Elevation Satellite (ICESat) Data Quality Information The Geoscience Laser Altimeter System (GLAS) instrument aboard the Ice, Cloud, and land Elevation (ICESat) satellite launched on 12 January 2003.  The primary objective of the ICESat mission is to provide global measurements of polar ice sheet elevation to discern changes in ice volume (mass balance) over time. Secondary objectives of the mission are to measure sea ice roughness and thickness, cloud and atmospheric properties, land topography, vegetation canopy heights, ocean surface topography, and surface reflectivity. The GLAS instrument has three lasers, each of which has a 1064 nm laser channel for surface altimetry and dense cloud heights, and a 532 nm lidar channel for the vertical distribution of clouds and aerosols. The three lasers have been operated one at a time, sequentially throughout the mission.  To extend mission life, the current operational mode has included 33-day to 56-day campaigns, several times per year.  As of abstract submission, a total of seven operational campaigns have been completed. Multiple releases of the ICESat/GLAS data are now available at the National Snow and Ice Data Center (http://nsidc.org/data/icesat/). Here, we present data quality information for the several operational campaigns.  The metadata table includes: Laser transmit energies for the two wavelengths; laser footprint size and shape; and pointing and geolocation accuracies.  We also provide up-to-date information about the product release versions for each of the 15 data products. GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  18. Plans • Next data release: Rel#23 (elev.) products: GLA06, and 12-15, for Laser 3A period. • Will have improved pointing data compared to rel#22 elev products.  • Bob S. working to understand why pointing correction for rel#23 (Laser 3A) differs from that of Laser 2A period • Rel. 24 will contain format and file size changes • Subsetter changes (From Kris’s talk, slide #13) • Record lengths have changed for GLA05-15 • V5.0 libraries will not work with v4.x data and visa versa – bear this in mind when exporting libraries to run F90 routines GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  19. Plans • DEM • We’ll review what John DiMarzio has and provide further input (in addition to input from Ted Scambos, Oct. 8) • FAQ re: multiple releases • Action item from June STM • I sent draft to Bob S. June 13 • Awaiting Bob’s reply • Will this be OBE by Rel#24? GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  20. New (interim) POC at NSIDC Doug Fowler dfowler@nsidc.org 303-735-1357 GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  21. Summary • We’re distributing rel#22 data • We’re providing subsetting • We’re looking for DEM • We’re looking for rel#23 (GLA06, 12-15) • We’re looking for rel#24 (one release with all public data) • We’re working on Borg Table GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  22. Backup Slides GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  23. Ted’s Input re: DEM, Oct., 8 I think the best format is an image-like format, with elevations reported as integers (or reals) at each grid node. This is the most-used format for the RAMP DEM of Antarctica. However, it will also be valid and useful for some to report the data in a compressed ascii "lat long elev geoid" table, one line for each grid cell. This second format may be very large (10s of gigabytes) but is easily subsetted upon request.  The image-format is more compact, but it does require good geo-spatial handling tools to manipulate. So I think both formats. Other information can be incorporated in ascii 'read me' files and the websites. Antarctica: Polar Stereographic, -71 plane of projection, 0longitude = y axis, WGS84 ellipsoid. That is, identical to RAMP, MOA, and a host of other maps. Greenland: Polar Sterographic, -70 plane of projection, 45longitude = yaxis, WGS84 ellipsoid (NOT TOPEX, NOT Hughes-SSM/I ellipsoids.) This is the emerging US standard for Greenland image maps (e.g., Joughin, Kwok radar maps). The MOG mosaic is also in this projection. I think Terry can provide further corner-point and grid dimension details. GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  24. FAQ about multiple releases Hi, Bob, At the last GLAS STM, I took an action item to sketch a draft explanation for users explaining why it's so difficult to have just one release of all data.  I think if we explain the reason for all the multiple releases, it'll diminish users' frustration caused by the confusion.  My draft below is meant only as a starting point from which you can write a more comprehensive explanation. We might post this explanation on any of the following URLs. Let me know if you have a suggestion on where you'd like to see it. http://nsidc.org/data/icesat/data.htmlhttp://nsidc.org/data/icesat/detailed_disclaimer.htmlhttp://nsidc.org/data/icesat/data.html#release_schedule"Multiple releases of the ICESat/GLAS data are currently available as the science team works to provide the highest possible quality data to the public.  Some time periods have been corrected for certain issues, while other time periods haven't had such corrections applied to them (for lack of time as of now, but will be corrected eventually). Various complexities of this mission have occupied the time of the science team and data producers, preventing them for creating one release of data in which all data values have been treated equally.  Different laser operating temperatures and different satellite modes (airplane vs. sailboat) are examples of the factors that have varied across the time of the mission. In addition to the various types of corrections applied to the data, the EDG client (the search and order interface at NSIDC via which many users order data) has limitations that mean an additional, older release of data may still be available to the public even though an improved release for certain dates is available also.  For instance, Rel#18 data for Fall 2003 (laser 2A) are still available to the public, even though Rel#19 data for those same dates are available:  This is because Rel #18 covers two time periods (both Fall 2003 and Spring 2003, during which laser 1 operated).  Rel #19 doesn't cover the laser 1 time period (nor does any higher-level public release of data).  Thus NSIDC continues to provide public access to Rel #18 data for Spring 2003.  The EDG client doesn't allow for only certain periods of a given release to be available.  In order for NSIDC to provide Rel#18 data for Spring 2003, we must also provide Rel #18 data for Fall 2003. Users are urged to use the highest-level release for any given date of data. The table at XXX URL (the Excel table I emailed you this morning) provides information about the laser operations during the various campaigns of the ICESat mission." Thanks, Melinda GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  25. Dist. Stats from start of mission (via Data Pool) GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  26. ICESat: Status of current operations • Fifth Release: Jan. 18 2005 (Altimetry and Atmospheric) • Release-19 for GLA01-15 • Sept. 26-Nov. 18, 2003; laser #2A • Because rel#19 doesn’t cover laser #1, NSIDC is distributing both rel#18 and rel#19 data • Fourth Release: 24 Sept 2004 (Altimetry and Atmospheric) • Release-18 for GLA01, 02, 05-15 • Sept. 25 - Nov 18, 2003; laser #2A • Release-18 for GLA08-11 • Sept. 30 - Nov 18, 2003; laser #2A • Release-18 for GLA01, 02, 05, 06 &07 • Feb. 20-March 20, 2003; laser #1 • Release-18 for GLA08 & 09 • Feb. 20-March 19, 2003; laser #1 • Release-18 for GLA12, 13, 14 & 15 • Feb. 20-March 19, 2003; laser #1 • Replaces Rel#13, 14 &17 because same temporal coverage GLAS receiver/Optics breadboard telescope. Photo courtesy of NASA/GSFC. GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  27. Rel#12, 13, 14 & 17 No Longer Available • First Release: 30 Oct 2003 (Altimetry and Atmospheric) • Release-12 for GLA01-15 • Mar 12-20 2003; laser#1 • Available via EDG and SNOWI • Hidden from public upon ingest of Release-18 • Second Release: 07 April 2004 (Altimetry) • Release-13 for GLA01 • Release-14 data for GLA05, GLA06, and GLA12-15 • Oct. 15 – Nov. 18 2003; 33-day sample data set, laser #2A • Hidden from public upon ingest of Release-18 • Third Release: 19 June 2004 (Atmospheric, 532 nm) • Release-17 for GLA02, 07, 08, 09 • Atmospheric products GLA02, 07, 08, 09 • Oct. 16 - Nov. 18, 2003; 33-day sample data set, laser #2A • Hidden from public upon ingest of Release-18 GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  28. Ordering ICESat/GLAS Data from NSIDC Data Pool Search ‘N Order Web Interface (SNOWI) EOS Data Gateway (EDG) Subscription http://nsidc.org/data/icesat/order.html GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  29. Disclaimer GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  30. Release Notes GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  31. Release Info Table GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

  32. Tools Page GLAS Science Team Meeting Melinda Marquis, NSIDC DAAC Oct. 13-14, 2005

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