Data Products via TRMM Online Visualization and Analysis System

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Accessing Global Precipitation

ccess g G ob

ec p

o

Data Products via TRMM Online

Visualization and Analysis System

(TOVAS)

Zhong Liu Zhong Liu

Center for Spatial Information Science and Systems (CSISS), George Mason University y

and

NASA Goddard Earth Sciences Data and Information Services Center (GES DISC)

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Outline

 _{Brief overview of TRMM}  _{Introduction of TOVAS}

 _{Precipitation products in TOVAS}  _{Precipitation products in TOVAS}  _{TOVAS interface overview}

 _{Functions and examples}  _{Other ancillary tools}

 _{Other ancillary tools}  _{Future plans}

 _{Other TRMM data and services at GES DISC}  _{Demos and hands on exercises}

 _{Demos and hands-on exercises}  _Questions

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Brief Overview of TRMM

 _{Tropical Rainfall Measuring Mission}

(TRMM)

S li f i b 35°S d 35°N

 _{Sampling footprint between 35°S and 35°N}

 _{4-D distribution of rainfall and latent}  _{4 D distribution of rainfall and latent}

heating over vastly under-sampled oceanic and tropical continental regimes

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PR 247Km (5km) PR – 247Km (5km)

TMI – 878km (5.1km, 85.5GHz) VIRS – 833 km (2.4km)

GES DISC i th GES DISC is the

TRMM data archive center

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TOVAS I t

d

ti

TOVAS Introduction

Wh TOVAS?

Why TOVAS?

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Traditional Way vs. TOVAS in Data

y

Evaluation for a New User

Traditional Way:

• Obtain data from a

TOVAS:

• Basic analysis and

Obtain data from a FTP site

• Read data manuals

• Basic analysis and visualization (no

• Read data manuals • Learn software if

available

software and data download needed)

available

• If not available, write ft

download needed)

your own software • Write visualization

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System Description

•Reliable

System Description

•Flexible

•Low-cost

Visualization and Analysis Server

•Low-cost

Receive Parameters from Interface

CGI _C

GrADS Environment Output to _Web

Browser CGI _Compose GrADS Script Execute GrADS Script Generate Plot/ASCII Output Browser Receive Output to p p Parameters from Web Client Output to Web Client Data: Binary or GDS

GrADS: The Grid Analysis and Display System (COLA)

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Products in TOVAS



Near real time



Near-real-time



Rainfall Archives



Rainfall Archives



Ground Observation Archives



Other Ancillary Products

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

Near-real-time



Near-real-time



3-Hourly combined (3B42RT)



3-Hourly combined (3B42RT)



3-Hourly microwave (3B40RT)



3 Hourly microwave (3B40RT)



Hourly IR (3B41RT)



Hourly IR (3B41RT)



Daily (derived from 3B42RT)

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

Rainfall Archives



3-Hourly (3B42)

y (

)



Daily (derived from 3B42)

y (

)



10-day (derived from 3B42)

y (

)



Monthly (3B43, 3A12, 3A25,

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



Willmott (1950-1999, 0.5 deg)

(

g)

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Oth

Others:

•Monthly Global Precipitation (GPCP)

• Prototype Interactive Inter-comparison of Rainfall Products Prototype Interactive Inter comparison of Rainfall Products • Monthly Rainfall (3B43 V6) Anomaly

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TOVAS Landing Page:

htt //di 2

/Gi

i/t

/

http://disc2.nascom.nasa.gov/Giovanni/tovas/

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Two Two types of

GUIs GUIs

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Accessing new interfaces:

g

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TOVAS Functions:

•Animation •Animation

•Lat-Lon Area Plot, Time-averaged •Lat Lon Plot Difference Map

•Lat-Lon Plot, Difference Map •Latitude-Time Hovmöller Plot •Longitude-Time Hovmöller PlotLongitude-Time Hovmöller Plot •Correlation Plot

•Comparison PlotComparison Plot

•Cross-Map Plot (Latitude-Height) •Cross-Map Plot (Longitude-Height)Cross Map Plot (Longitude Height) •Cross-Map Plot (Time-Height)

•Scatter Plot

•Scatter Plot, Time-averaged •Time Series, Area-averaged g •Time Series Difference

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Other Features:

Cli t l

• Climatology

• Anomaly and normalized anomalyAnomaly and normalized anomaly • Fine tune graphic output

• Output in other formats (e.g., NetCDF)

G l E h KMZ fil

• Google Earth KMZ file output

• Application examples with real events

• FAQ and documentation

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 _{2D Lat-Lon Plots (Record breaking rainfall in the}

Mid-Atlantic Region in 2003) Atlantic Region in 2003)

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 _{2D Plots (The contribution of Isabel in 2003)}

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 _{Time Series Plots}

Floyd Alex, _Charley,

G t Gaston Isabel Mid-Atlantic Region Region

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 _{Hovmoller Diagram (Mid-Atlantic Region)} Multiple Tropical Storms Isabel Isabel Floyd

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Prototype Interactive Inter-comparison of Rainfall Products

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Other Ancillary Tools

 _{Hurricane Data Analysis Tool (HDAT)}

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Hurricane Data Analysis Tool: htt //di f /HDAT http://disc.gsfc.nasa.gov/HDAT

The global merged IR product, also known as, the NCEP/CPC g g p 4km Global (60ºN - 60ºS) IR Dataset, is one of TRMM ancillary datasets. •4 km IR •Global (60ºN 60ºS) •Global (60 N - 60 S) •30 minutes •Since Feb 2000 •Since Feb., 2000

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Basic Functions and Features:

•Selection of area of interest

Si l i lti l i ( i ti )

•Single image or multiple images (animation) •Allow time skipping (1 hr., 2 hr., etc.)

Allo different image si es

•Allow different image sizes •False color

Fine tune graphic output

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HDAT Landing Page HDAT Landing Page

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HDAT Landing Page (Cont ): HDAT Landing Page (Cont.):

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Examples: Category 2 cyclone Catarina Landfall Examples: Category 2 cyclone Catarina – Landfall

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

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Dust Strom (near Iraq and Saudi

(

q

Arabia border)

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Dust Storm (cont.)

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TOVAS and HDAT

2010

2009 2010

2009

Flooding in Pakistan due to higher-than-normal

i f ll b t J l A 2010

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Other Giovanni Tools:

htt //di

i

f

/ i

i

http://disc.sci.gsfc.nasa.gov/giovanni

Giovanni: GES-DISC (Goddard Earth Sciences Data and Information Services Center) Interactive Online Visualization ANd aNalysis Infrastructure

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Cloud Water in g/m3 Cloud Ice in Precipitation Ice i / 3 ( l d (scaled by 100) g/m3 (scaled by 100) in g/m3 (scaled by 100)

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Future Plans for TOVAS:

 _{Add more functions}

 _{IPWG: a proposal for adding IPWG}_{p p} _g

validation algorithms is pending

Add TRMM L l 2 bit l d t (

 _{Add TRMM Level-2 orbital data (a}

prototype to extract 2A12 and 2A25 profiles

p yp p

is ready for YOTC)

Add l i d ( Cl dS )

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Other TRMM data and services

at GES DISC

 _Mirador

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TRMM D t A hi

t GES DISC

TRMM Data Archive at GES DISC

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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)}  _{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 File Total: 5,714,107 Total size: ~29.7 TB

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Mirador Basic Features:

http://mirador.gsfc.nasa.gov/

 _{Search features:}  _{Search features:} Keyword/event h j t search, projects, science focus areas

 _{Spatial subsetting}

(limited products) (limited products)

 _{Format conversion}

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Other Data Access Methods:

 _{Giovanni TOVAS (TRMM Online}

Visualization and Analysis System)

G ADS D t S (GDS) ( b tti d

 _{GrADS Data Server (GDS) (subsetting and}

analysis services over the Internet)y )

 _{OPeNDAP (accessed by IDL, GrADS)}

 _{The Open Geospatial Consortium (OGC) Web}

Map Server (WMS) Map Server (WMS)

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 _{Generate a lat-lon map}

 _{Generate a time series and its ASCII data}

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URLs:

 _{TOVAS: http://disc2 nascom nasa gov/Giovanni/tovas/}  _{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}  _Giovanni:_{http://disc.sci.gsfc.nasa.gov/giovanni}  _{GES DISC: http://disc.sci.gsfc.nasa.gov/}

C Zh Li @

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Thank You!