Data Products via TRMM Online Visualization and Analysis System

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1 Accessing Global Precipitation Data Products via TRMM Online Visualization and Analysis System (TOVAS) Zhong Liu Center for Spatial Information Science and Systems (CSISS), George Mason University and NASA Goddard Earth Sciences Data and Information Services Center (GES DISC)

Spatial Information Science and Systems (CSISS), George Mason

2 Outline Brief overview of TRMM Introduction of TOVAS Precipitation products in TOVAS TOVAS interface overview Functions and examples Other ancillary tools Future plans Other TRMM data and services at GES DISC Demos and hands-on exercises Questions

Functions and examples Other ancillary tools Future plans

3 Brief Overview of TRMM Tropical Rainfall Measuring Mission (TRMM) Sampling footprint between 35 S and d35 N 4-D distribution of rainfall and latent heating over vastly under-sampled oceanic and tropical continental regimes

N 4-D distribution of rainfall and latent heating over

4 PR 247Km (5km) TMI 878km (5.1km, 85.5GHz) VIRS 833 km (2.4km) GES DISC is the TRMM data archive center Courtesy of trmm.gsfc.nasa.gov

5 TOVAS Introduction ti Why TOVAS?

6 Traditional Way vs. TOVAS in Data Evaluation for a New User Traditional Way: Obtain data from a FTP site Read data manuals Learn software if available If not available, write your own software Write visualization software TOVAS: Basic analysis and visualization (no software and data download needed)

a FTP site Read data manuals Learn software if available If not available,

7 TOVAS

8 Reliable Flexible Low-cost System Description Visualization and Analysis Server Receive Parameters from Interface CGI Receive Parameters from Web Client Compose GrADS Script GrADS Environment Execute Generate GrADS Plot/ASCII Script Output Output to Web Browser Output to Web Client Data: Binary or GDS GrADS: The Grid Analysis and Display System (COLA)

GrADS Environment Execute Generate GrADS Plot/ASCII Script Output Output to Web Browser

9 Products in TOVAS Near-real-timereal Rainfall Archives Ground Observation Archives Other Ancillary Products

10 Near-real-time 3-Hourly combined (3B42RT) 3-Hourly microwave (3B40RT) Hourly IR (3B41RT) Daily (derived from 3B42RT)

11 Rainfall Archives 3-Hourly y( (3B42) Daily y( (derived from 3B42) 10-day y( (derived from 3B42) Monthly (3B43, 3A12, 3A25, GPCP, etc.)

12 Ground Observation Archives Willmott ( , 0.5 deg) GPCC (1986 present, 1 deg)

13 Others: Monthly Global Precipitation (GPCP) Prototype Interactive Inter-comparison of Rainfall Products Monthly Rainfall (3B43 V6) Anomaly Inter-Comparison of Rainfall Climatology

14 TRMM Web Interface Overview

15 TOVAS Landing Page: /Gi i/t / New

16 Two types of GUIs

20 Accessing new interfaces: New

26 TOVAS Functions and Examples

27 TOVAS Functions: Animation Lat-Lon Area Plot, Time-averaged Lat-Lon Lon Plot, Difference Map Latitude-Time Hovmöller Plot Longitude-Time Hovmöller Plot Correlation Plot Comparison Plot Cross-Map Plot (Latitude-Height) Cross-Map Plot (Longitude-Height) Cross-Map Plot (Time-Height) Scatter Plot Scatter Plot, Time-averaged Time Series, Area-averaged Time Series Difference Time Series, Area Statistics

28 Other Features: Climatology l Anomaly and normalized anomaly Fine tune graphic output Output in other formats (e.g., NetCDF) Google Earth hkmzfil file output Application examples with real events FAQ and documentation Help desk

29 2D Lat-Lon Plots (Record breaking rainfall in the Mid- Atlantic Region in 2003) Atlantic Region in 2003)

30 2D Plots (The contribution of Isabel in 2003) Isabel

31 Time Series Plots Floyd Alex, Charley, Gaston Isabel Mid- Atlantic Region

32 Hovmoller Diagram (Mid-Atlantic Region) Multiple Tropical Storms Isabel Floyd

33 Anomaly (Positive anomaly due to Isabel in Sept., 2003)

34 Scatter Plot (Error vs Rain Rate, revealing biases)

35 ASCII data output for further analysis (e.g. MS. Excel)

36 Prototype Interactive Inter-comparison of Rainfall Products

39 Other Ancillary Tools Hurricane Data Analysis Tool (HDAT) Other Giovanni Tools

40 Hurricane Data Analysis Tool: /HDAT The global merged IR product, also known as, the NCEP/CPC 4km Global (60ºN - 60ºS) IR Dataset, is one of TRMM ancillary datasets. 4 km IR Global (60ºN - 60ºS) 30 minutes Since Feb., 2000

41 Basic Functions and Features: Selection of area of interest Single image or multiple l images (animation) Allow time skipping (1 hr., 2 hr., etc.) Allow different image sizes False color Fine tune graphic output

42 HDAT Landing Page

43 HDAT Landing Page (Cont.):

44 HDAT Landing Page (Cont.):

45 HDAT Landing Page (Cont.):

46 Examples: Category 2 cyclone Catarina Landfall

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

48 Dust Strom (near Iraq and Saudi Arabia border)

49 Dust Storm (cont.)

50 TOVAS and HDAT Flooding in Pakistan due to higher-than-normal monsoon rainfall between Jul Aug. 2010

53 Other Giovanni Tools: i / i i Giovanni: GES-DISC (Goddard Earth Sciences Data and Information Services Center) Interactive Online Visualization ANd analysis Infrastructure

55 Cloud Water in g/m3 Cloud Ice in Precipitation Ice (scaled by 100) g/m3 (scaled in g/m3 3( (scaled by 100) by 100)

56 Future Plans for TOVAS: Add more functions IPWG: a proposal p for adding IPWG validation algorithms is pending Add TRMM Level-2 orbital ldata (a prototype to extract 2A12 and 2A25 profiles is ready for YOTC) Add multi-sensor data (e.g., CloudSat)

57 Other TRMM data and services at GES DISC Mirador Other data accessing methods

58 TRMM Data Archive at GES DISC

59 Data Volumes (as of Sept. 22, 2010) Standard products (L-1, L-2, L-3, orbital, gridded): ~20.3 TB (772,553 files) Ancillary data: ~1.9 TB (93,051 files) Ground based instruments: ~4.5 TB (1,853,484) Subsets: ~3.1 TB (2,995,019) File Total: 5,714,107 Total size: ~29.7 TB

60 Mirador Basic Features: Search features: Keyword/event search, projects, science focus areas Spatial subsetting (limited products) Format conversion (e.g., NetCDF)

61 Other Data Access Methods: Giovanni TOVAS (TRMM Online Visualization and Analysis System) GrADS Data Server (GDS) (subsetting and analysis services over the Internet) OPeNDAP (accessed by IDL, GrADS) The Open Geospatial Consortium (OGC) Web Map Server (WMS) Google Earth

62 Demos and Hands-on Exercises

63 Generate a lat-lon map Generate a time series and its ASCII data New interface and data download options

64 URLs: TOVAS: nasa HDAT: Mirador: Giovanni: gov/giovanni GES DISC: Contact:

65 Thank You!

TRMM and Other Global Precipitation Products and Data Services at NASA GES DISC. Zhong Liu George Mason University and NASA GES DISC

TRMM and Other Global Precipitation Products and Data Services at NASA GES DISC Zhong Liu George Mason University and NASA GES DISC Outline Introduction of data and services at GES DISC TRMM and other