# Presentation: 225600

## Giovanni

**G**oddard **I**nteractive **O**nline **V**isualization **AN**d a**N**alysis **I**nfrastructure
- NASA Goddard Space Flight Center

**http://giovanni.gsfc.nasa.gov/**

- Contributions by Greg Leptoukh and Steven Lloyd, NASA-GSFC

## http://giovanni.gsfc.nasa.gov/

## What is Giovanni?

- Giovanni provides a simple and easy way to explore, visualize, analyze, and access vast amounts of  Earth science remote sensing  and model data.
**http://giovanni.gsfc.nasa.gov/**

## Ability to Visualize lots of data

- What is Giovanni?

**A**

**B**

**D**

**E**

**C**

**F**

- C

**D**

**E**

**B**

**A**

**C**

**F**

- Area Plot

- Time Series

- Model Output

- Profile Cross-Section

- Correlations

- Column Densities

## Capabilities

**Basic (one-parameter):**
**Area plot** – averaged or accumulated over any data period for any rectangular area (various map projections)
**Time plot** – time series averaged over any rectangular area
**Hovmöller plots** –longitude-time or latitude-time cross sections
**ASCII output** – for all plot types (can be used with GIS apps)
**Image animation** – for area plot
**Vertical** **profiles**
**Vertical cross-sections, zonal means**

**http://giovanni.gsfc.nasa.gov/**

## Capabilities

**Beyond basics:**
**Area plot**** **- geographical inter-comparison between two parameters
**Time plot**** **- an X-Y time series plot of several parameters
**Scatter plots**
**Temporal correlation map** - relationship between two parameters at each grid point in the selected spatial area
**Temporal correlation of entire area**
**Difference plots**
**Anomaly plots**
- Etc, and more in the future

**http://giovanni.gsfc.nasa.gov/**

## Simple to Use

**No** need to learn **data formats and programming.**

**No** need to **download large amounts** of data.

**Customized data and analyses** can be obtained with only a **few mouse clicks.**

- Caution: *Giovanni is an **exploration** tool!*

**http://giovanni.gsfc.nasa.gov/**

## Access to many datasets

## Some examples

## MOVAS

- Comparisons of MODIS (Terra and Aqua), MISR and GOCART model products

## MOVAS data sets

## MOVAS Select Parameters

## Using MOVAS to track dust plumes

**Area**

**Parameters**

**Map, Hovmöller, **
**or time-series plot**

**Sahara Desert:  Aerosol Optical Depth and Relative Humidity**

## Tracking a dust storm

## AOD global time series

- Ocean only

- Daily (MOD08_D3)

- Monthly (MOD08_M3)

- 0.24
- 0.20
- 0.16
- 0.12
- 0.08

- 0.24
- 0.20
- 0.16
- 0.12
- 0.08

- 2001 2002 2003 2004 2005

- 2001 2002 2003 2004 2005 2006

## Studying correlations between Chlorophyll-a and SST in the northern East China Sea using MODIS-Aqua

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

**Temporal correlation map**

**Time-series**

-   San Francisco, CA

## Multi-parameter scatter plots

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

**Plot Type**

**Time Period**

-   San Francisco, CA

## Multi-Parameter Scatter Plots

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

**Multi-Parameter Scatter Plots**

**July 2003**

**December 2003**

**Scatter plots also demonstrate increased chlorophyll **
**concentration, decreased SST during winter upwelling regime**

-   San Francisco, CA

## Hovmoller (time-longitude) plots

- Ascending (daytime)

- Descending (nighttime)

- Total OZONE
- 	30°-60° North
- 	10 Oct-26 Oct 2002

## Giovanni for multiple datasets

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

-   San Francisco, CA

## Download page

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

## A-Train Data Depot

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

-   San Francisco, CA

**Comparison of A-Train Datasets Along CloudSat Orbital Track**

## Aerosols

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

-   San Francisco, CA

**Studying Aerosols... **
**Vertical Profiles (curtain plots) and Horizontal Strips ±100 km from CloudSat and CALIPSO nadir**

**http://giovanni.gsfc.nasa.gov/**

## Giovanni & Google Earth

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

**Importing Giovanni Data into Google Earth****  **

-   San Francisco, CA

## A-Train in Google Earth via Giovanni: Calipso Lidar

- 12 December 2007

- Gregory Leptoukh	2007 Fall AGU Meeting

**A-Train in Google Earth *****via***** Giovanni: Calipso Lidar**

-   San Francisco, CA

## Giovanni is a great tool

- Processing goes on behind the scenes

- Giovanni is a black box

## AOD global time series

- Ocean only

- Daily (MOD08_D3)

- Monthly (MOD08_M3)

- 0.24
- 0.20
- 0.16
- 0.12
- 0.08

- 0.24
- 0.20
- 0.16
- 0.12
- 0.08

- 2001 2002 2003 2004 2005

- 2001 2002 2003 2004 2005 2006

- Why is daily mean > monthly mean ?
- Complications of “data averaging”

## Giovanni is simple

**No** need to learn **data formats and programming.**

**No** need to **download large amounts** of data.

**Customized data and analyses** can be obtained with only a **few mouse clicks.**

- But remember: *Giovanni is an **exploration** tool!*

**http://giovanni.gsfc.nasa.gov/**