1. Online Inter-comparison of Satellite-derived Global Precipitation Products
Zhong Liu1,2, Dana Ostrenga1,3, William Teng1,4, and Steven Kempler1
1Goddard 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., USA
4Wyle Information Systems, Inc., USA

2. Outline Introduction Overview of inter-comparison effort at GES DISC
Examples
Future work
Summary and URLs

3. 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

4. Overview of inter-comparison effort

5. In this talk:

9. 3B43 (0.25 deg)

10. 3B43

11. 3B43

12. 3B43

13. 3A25 Version 6
TRMM satellite altitude was changed from 350 km to km in August 2001

14. 3A25 Version 7

15. 3A25 Problem (Mar. 2011)

16. 3A12 (0.5 deg.)

17. 3A11 (5 deg.)

19. 3B42 – 3B42RT
Dry
Wet
Annual
Big Island, Hawaii

21. Big Island, Hawaii
3B42
3B42RT
Overlay
Scatter

22. 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

23. Simple
All products

25. Samples

26. Merged IR (recommended):
The Hurricane Data Analysis Tool (HDAT) Landing Page

27. HDAT Landing Page (Cont.):

28. AF Flight-447: Satellite Observation of Mesoscale Convective System Development on 1 June, 2009

29. Future Plans Additional parameters products (mostly in monthly)
To quantify inter-comparison results by adding the statistical methods found in, (available in

30. Future Plans (Cont’) 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

31. 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

32. Acknowledgements: The inter-comparison tools are supported by NASA Research Opportunities in Space and Earth Science (ROSES-2010), NNH10ZDA001N-ESDRERR, Appendix A.32: "Earth System Data Records Uncertainty Analysis" and the NASA GES DISC. Special thanks to the Giovanni Team.

33. URLs: Contact: Zhong.Liu@nasa.gov
TOVAS:
HDAT:
Mirador:
Giovanni:
Current conditions:
GES DISC:
Contact: