Overview of Giovanni GES-DISC Interactive Online Visualization ANd aNalysis Infrastructure


Giovanni is a Web-based application developed by the GES DISC that provides a simple and intuitive way to

visualize, analyze, and access vast amounts of Earth science remote sensing data without having to download

the data. Giovanni is an acronym for the GES-DISC (Goddard Earth Sciences Data and Information Services

Center) Interactive Online Visualization ANd aNalysis Infrastructure.

From the researcher's point of view, Giovanni is comprised of a number of interfaces, each tailored to meet

the needs of specific fields of Earth science research. Each interface, known as an instance, provides

functions and parameters applicable to that specific area of Earth science.

Listed below are the current Giovanni instances.

1.1 A-Train (Cloudsat, CALIPSO, MODIS-Aqua, and AIRS data)

1.2 MOVAS Daily and Monthly (atmospheric parameters from MODIS)

1.3 Northern Eurasian Earth Science Partnership Initiative (NEESPI)

1.4 Total Ozone Mapping Spectrometer (TOMS) Daily

1.5 Ozone Monitoring Instrument (OMI) Daily and L2G

1.6 Microwave Limb Sounder (MLS)

1.7 Atmospheric Infrared Sounder (AIRS)

1.8 Ocean Color Radiometry Monthly; Ocean Model Daily and Ocean Model Monthly

1.9 High Resolution Dynamics Limb Sounder (HIRDLS)

1.10 Multi-Angle Imaging SpectroRadiometer (MISR)

1.11 Air Quality

1.12 TOVAS (precipitation parameters from TRMM)

1.13 MERRA 2D. MERRA 3D. MERRA Monthly Analysis, MERRA Chemical Forcing

1.14 GLDAS Monthly

1.15 Tropospheric Emisson Spectrometer (TES)

1.16 Monsoon Asia Integrated Regional Study (MAIRS), Monthly and 8-Day

1.17 Clouds and the Earth's Radiant Energy System (CERES)


1.1 A-Train Giovanni

The A-Train Giovanni instance has Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua and

CloudSat data with curtain plot visualizations along the CloudSat track.

As the A-Train of satellites circles Earth, about eight minutes elapse between the times when the first

satellite (Aqua) and the last (Aura) pass over any given spot. Overall, the string of satellites stretches across

3,000 kilometers (1,864 miles) in space, with each traveling about 7 kilometers per second (4.3 miles per

second). The CloudSat radar trails Aqua by an average of about 60 seconds. CloudSat flies approximately

460 kilometers (286 miles) behind Aqua and much closer in front of CALIPSO, only around 93.8 kilometers

(58.3 statute miles) away. This distance corresponds to an average delay of only 12.5 seconds between lidar

and radar measurements.


1.2 MOVAS Daily and Monthly Giovanni

The MODIS Visualization and Analysis System (MOVAS) Giovanni instance displays atmospheric

parameters from the MODIS instruments on both the Terra and Aqua satellites.


1.3 NEESPI Giovanni

The NEESPI Giovanni instance supports the Northern Eurasia Earth Science Partnership Initiative, a

currently active and strategically evolving program of internationally-supported Earth systems science

research, which has as its foci issues in northern Eurasia that are relevant to regional and global scientific and

decision-making communities.


1.4 Total Ozone Mapping Spectrometer (TOMS) Daily Giovanni

The Giovanni instance for the Total Ozone Mapping Spectrometer (TOMS) encompasses daily observational

data covering the long and famous history of this pioneering instrument. This instance features data from

three different TOMS missions: Nimbus-7 (1978-1993), Meteor-3 (1991-1994), and Earth Probe (1996-

2005). Note that Earth Probe (EP-TOMS) data after 2001 are not recommended for trend analysis. The data

consist of daily level 3 global 1.0° x 1.25° gridded products.


1.5 Ozone Monitoring Instrument (OMI) Daily and L2G Giovanni

The successor to TOMS is the Ozone Monitoring Instrument (OMI) on the EOS Aura satellite. The OMI

Giovanni instance provides data from this instrument, commencing in August 2004 and continuing to

present. OMI data in Giovanni consist of daily level 3 global gridded ozone products at two spatial

resolutions: high-resolution 0.25° x 0.25° (OMTO3E) and TOMS-like 1.0° x 1.25° (OMTO3D).


1.6 Microwave Limb Sounder (MLS) Giovanni

The data in this Giovanni instance is from the Microwave Limb Sounder (MLS) on the Earth Observing

System (EOS) Aura satellite. An earlier MLS instrument was flown on the Upper Atmosphere Research

Satellite (UARS). The MLS provides atmospheric profile data of the atmospheric concentrations of many

different chemical species.


1.7 Atmospheric Infrared Sounder (AIRS) Giovanni

The Atmospheric Infrared Sounder (AIRS) on the Aqua satellite provides data in both map and profile form

for primary atmospheric variables including temperature, pressure, cloud parameters, water vapor and liquid

water. AIRS data is useful for investigations of meteorological phenomena and climate.


1.8 Ocean Color Radiometry Monthly Giovanni

The Oceans Monthly Giovanni instance provides monthly Level 3 data from the Sea-viewing Wide Field-of-

view Sensor (SeaWiFS) and MODIS-Aqua, including sea surface temperature and derived optical products.

The primary ocean data products in this instance are provided by the Ocean Biology Processing Group

(OBPG) at NASA GSFC.


1.9 High Resolution Dynamics Limb Sounder (HIRDLS) Giovanni

The High Resolution Dynamics Limb Sounder (HIRDLS) is a joint mission of the United States and the

United Kingdom (UK). HIRDLS is carried on the Aura satellite and provides atmospheric profile

concentration data for several chemical species. New HIRDLS data products will be added to this instance as

they become available.


1.10 Multi-angle Imaging SpectroRadiometer (MISR)

The Multi-angle Imaging SpectroRadiometer (MISR) is carried on the Terra satellite and is a Jet Propulsion

Laboratory (JPL) sensor mission. MISR's cameras provide nine different viewing angles of the Earth's

atmosphere and surface. MISR data can thus provide information about atmospheric aerosols, clouds, and

land surface cover.


1.11 Air Quality

The Giovanni Air Quality instance combines global atmospheric aerosol and cloud data from MODIS, global

atmospheric aerosol data from OMI, and ground-based Fine Particulate Matter data for the continental

United States to allow investigation of air quality events and data for air quality monitoring. The Fine

Particulate Matter data is from the AIRNow program.



1.12 TOVAS

There are two Giovanni TOVAS instances. The first instance is designed for visualization and analysis of

the 3-hourly "Tropical Rainfall Measuring Mission (TRMM) and Other Rainfall Estimate" (3B42 V6) data

product. The second instance is designed for visualization and analysis of the TRMM Level-3 monthly data

products. Users can generate plots for area average (Lat-Lon Map), time-series (Time Series), Hovmöller

diagram and more. Animations are available for Lat-Lon Maps. Results can be downloaded in HDF, ASCII,

and Google Earth KMZ formats.



1.13 MERRA 2D and MERRA 3D

There are two MERRA (Modern Era Retrospective-analysis for Research and Application) instances,

MERRA 2D and MERRA 3D. The MERRA instances provide meteorological and atmospheric data from

an atmospheric observation reanalysis effort. The goal of MERRA is to place satellite observations in a

climate context with emphasis on the hydrological cycle. MERRA 2D provides two-dimensional mapped

data. MERRA 3D includes three-dimensional atmospheric data that can be visualized as vertical profiles.


1.14 GLDAS Monthly

The Global Land Data Assimilation System (GLDAS) is generating a series of land surface state (e.g., soil

moisture and surface temperature) and flux (e.g., evaporation and sensible heat flux) products simulated by

four land surface models (CLM, Mosaic, Noah and VIC). Current data holdings include a set of 1.0 degree

resolution data products from the four models, covering 1979 to the present; and a 0.25 degree data product

from the Noah model, covering 2000 to the present. This instance focuses on the 1.0 degree monthly

products. CLM stands for "Community Land Model" and VIC stands for "Variable Infiltration Capacity".


1.15 Tropospheric Emission Spectrometer

The Tropospheric Emission Spectrometer (TES) is another instrument on the Aura satellite. TES is an

infrared, high spectral resolution Fourier Transform Spectrometer (FTS). The TES Level-3 Version 2 data

set includes the following parameters: methane (CH4), carbon monoxide (CO), water vapor (H2O),

deuterated water vapor (HDO), nitric acid (HNO3), ozone (O3), and atmospheric temperature.


1.16 Monsoon Asia Integrated Regional Study (MAIRS)

The Monsoon Asia Integrated Regional Study (MAIRS) features data from several different satellite

instruments, along with assimilated data in models. MAIRS is intended to study the interactions of human

activities with the monsoon system and to determine how such activities may impact the future behavior of

the Asian monsoon.


1.17 Clouds and the Earth's Radiant Energy System (CERES)

The Clouds and the Earth's Radiant Energy System (CERES) experiment is one of the highest priority

scientific satellite instruments developed for the Earth Observing System. CERES products include both

solar-reflected and Earth-emitted radiation from the top of the atmosphere to the Earth's surface. Cloud

properties are determined using simultaneous measurements by other EOS instruments such as the Moderate

Resolution Imaging Spectroradiometer (MODIS). Analyses of the CERES data, which build upon the

foundation laid by previous missions such as the Earth Radiation Budget Experiment (ERBE), will lead to a

better understanding of the role of clouds and the energy cycle in global climate change.


Giovanni Analytical Services and Operations


Animation

Lat-Lon Area Plot, Time-averaged

Lat-Lon Plot, Difference Map

Latitude-Time Hovmöller Plot

Longitude-Time Hovmöller Plot

Correlation Plot

Comparison Plot

Cross-Map Plot (Latitude-Pressure)

Cross-Map Plot (Longitude-Pressure)

Cross-Map Plot (Time-Pressure)

Scatter Plot

Scatter Plot, Time-averaged

Curtain Plot

Time Series, Area-averaged

Time Series Difference

Time Series, Area Statistics

Vertical Profile

Zonal Mean

Histogram

Histogram, Area-Averaged

Histogram, Time-Averaged

For more information, users manual and links to the instances:

http://disc.sci.gsfc.nasa.gov/giovanni/overview/index.html