Post on 25-Mar-2022
Online Inter‐comparison of Satellite‐derived Global Precipitation Products
Zhong Liu1,2, Dana Ostrenga1,3, William Teng1,4, and Steven Kempler11Goddard Earth Sciences Data and Information Services Center (GES DISC)NASA Goddard Space Flight Center, Code 610.2, Greenbelt, MD, 20771, USA
2Center for Spatial Information Science and Systems (CSISS), George Mason University, USA
3ADNET Systems, Inc., USA4Wyle Information Systems, Inc., USA
Outline
• Introduction• Overview of inter‐comparison effort at GES DISC• Examples• Future work• Summary and URLs
Introduction
• NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) – TRMM product archive, data services, documentation and user support
• Product version changes (user defined ROI)• Product differences (inter‐comparison among different products)
• Discussion/suggestions during the 5th IPWG meeting
TRMM Composite Climatology (TCC)
• (TCC) consists of a merger of selected TRMM rainfall products over both land and ocean to give a "TRMM‐best" climatological estimate.
• V6 only
Future Plans
• Additional parameters products (mostly in monthly)
• To quantify inter‐comparison results by adding the statistical methods found in, http://www.cawcr.gov.au/projects/verification/(available in http://www.isac.cnr.it/~ipwg/)
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Future Plans (Cont’)
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Estimated and observed rain area Hits, misses, false alarms, correct rejections (2x2 contingency table)
Estimated and observed rain volume Bias score (ratio of estimated/observed rain frequency or area)
Estimated and observed conditional rain rate Probability of detection
Estimated and observed maximum rain rate False alarm ratio
Mean absolute error Hanssen and Kuipers score
Root mean square (RMS) error Equitable threat score
Correlation coefficient Heidke skill score
Summary
• Online inter‐comparison tools for precipitation products (mainly TRMM and TMPA, 3‐hourly, daily, monthly and climatology), help revealing product characteristics
• An online tool to visualize and analyze the merged IR product
• Inputs from the IPWG community are very important for current and future work
Acknowledgements: The inter‐comparison tools are supported by NASA Research Opportunities in Space and Earth Science‐ 2010 (ROSES‐2010), NNH10ZDA001N‐ESDRERR, Appendix A.32: "Earth System Data Records Uncertainty Analysis" and the NASA GES DISC. Special thanks to the Giovanni Team.
URLs:
• TOVAS: http://disc2.nascom.nasa.gov/Giovanni/tovas/• HDAT: http://disc.sci.gsfc.nasa.gov/HDAT• Mirador: http://mirador.gsfc.nasa.gov/• Giovanni: http://disc.sci.gsfc.nasa.gov/giovanni• Current conditions:
http://disc.sci.gsfc.nasa.gov/agriculture/additional/tools/current_conditions.shtml
• GES DISC: http://disc.sci.gsfc.nasa.gov/
Contact: Zhong.Liu@nasa.gov