NASA Giovanni: Earth Science Data Analysis Guide

NASA Giovanni (GES-DISC Interactive Online Visualization ANd aNalysis Infrastructure) is an online data exploration and analysis environment developed by the Goddard Earth Sciences Data and Information Services Center (GES DISC). Built as a core capability within NASA Earthdata, Giovanni enables researchers to analyze, visualize, and intercompare hundreds of global geophysical parameters directly in a web browser without needing to download massive data files. In environmental analysis and remote sensing, Giovanni serves as an accessible bridge between satellite data archives and published scientific findings.

What it is

NASA Giovanni was created by the GES DISC in Greenbelt, Maryland, to overcome the technical barriers associated with handling raw satellite observation files. Traditional remote sensing workflows require researchers to download terabytes of data files in hierarchical formats, write custom parsing scripts in Python, R, or MATLAB, and manage local storage arrays. Giovanni inverts this paradigm by executing spatial subsetting, temporal averaging, and statistical calculations server-side within NASA high-performance computing clusters.

The platform provides access to gridded atmospheric, oceanographic, and land surface variables spanning several decades of satellite missions and atmospheric reanalyses. Through its web interface, users generate publication-ready plots, calculate multi-variable correlations, and export processed sub-datasets under open access standards, complete with full provenance documentation.

Who runs it and what it covers

Giovanni is developed, maintained, and operated by the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC), located at the NASA Goddard Space Flight Center in Greenbelt, Maryland. GES DISC operates as one of twelve Distributed Active Archive Centers (DAACs) within NASA’s Earth Observing System Data and Information System (EOSDIS).

Disciplinary Scope and Key Data Holdings

Giovanni integrates hundreds of gridded Earth science variables derived from satellite instruments, suborbital field campaigns, and numerical assimilation models:

• Atmospheric Composition and Aerosols: Aerosol Optical Depth (AOD) and aerosol index from MODIS (Terra and Aqua), OMI (Aura), OMPS (Suomi NPP), and MERRA-2 assimilation models.
• Atmospheric Dynamics and Thermodynamics: Atmospheric temperature, relative humidity, geopotential height, cloud fraction, and cloud top pressure from AIRS (Aqua) and MERRA-2 reanalyses.
• Precipitation: Satellite-gauge combined precipitation estimates, including the Global Precipitation Measurement (GPM) Integrated Multi-satellite Retrievals for GPM (IMERG) and Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA).
• Hydrology and Land Surface Dynamics: Soil moisture, runoff, evapotranspiration, and snow water equivalent from the Global Land Data Assimilation System (GLDAS) and North American Land Data Assimilation System (NLDAS).
• Ocean Color and Marine Biology: Chlorophyll-a concentrations, diffuse attenuation coefficients, and photosynthetically available radiation (PAR) from SeaWiFS and MODIS.

Analytical Visualization Services

Unlike standard static imagery browsers, Giovanni provides a diverse suite of analytical statistical services grouped into four main operational categories:

• Maps: Time-averaged geographical maps, recurring climatological averages, animation sequences, accumulation maps (such as total rainfall over multi-day storm events), and user-defined overlay maps.
• Comparisons: Spatial correlation maps between two variables, difference maps subtracting one time period or sensor from another, and scatter plots (interactive, time-averaged, and area-averaged).
• Time Series: Area-averaged time series showing temporal evolution across a chosen bounding box, recurring seasonal cycles, and Hovmöller diagrams displaying variable propagation along longitude-time or latitude-time dimensions.
• Vertical Profiles: Pressure-level cross sections (latitude-pressure, longitude-pressure, and time-pressure) and space/time-averaged vertical atmospheric soundings.

How to search or use it

Researchers access and analyze data in Giovanni NASA using the following official interface procedure:

1. Authenticate via Earthdata Login: Open the Giovanni portal (giovanni.gsfc.nasa.gov). While guest access allows limited evaluation, an active NASA Earthdata login is required for full functionality. Users must authorize the NASA GESDISC DATA ARCHIVE application in their user profile.
2. Select Plot or Service Type: Choose the desired analytical visualization from the Select Plot menu (e.g. Time-Averaged Map, Area-Averaged Time Series, Correlation Map, or Hovmöller plot).
3. Define the Date Range: Enter the target temporal window in YYYY-MM-DD format, or select seasonal recurrence ranges to isolate specific months across multiple years.
4. Specify Region-of-Interest: Define spatial coordinates using the bounding box input boxes (West, South, East, North) or use the interactive map shape selector to draw a custom polygon.
5. Select Geophysical Variables: Locate variables using faceted filters (Discipline, Measurement, Platform/Instrument, Spatial Resolution, Temporal Resolution) or by typing keywords (e.g. “precipitation”, “aerosol optical depth”, “temperature”) into the search bar.
6. Generate the Visualization: Click the “Plot Data” button in the lower right corner to submit the workflow to the GES DISC processing engine.
7. Adjust Display Parameters: Once rendered, refine visualization options by altering color palettes, switching between linear and logarithmic scales, setting min/max threshold bounds, or changing map projections (such as Plate Carrée or Polar Stereographic).
8. Export Analytical Data and Lineage: Download the final graphic in PNG or PDF format, or export the underlying processed data as GeoTIFF, NetCDF, or CSV. Consult the Lineage panel to view the exact algorithms and input granules used.

Strengths and limits

Strengths

• Zero-download exploration: Researchers can rapidly test hypotheses, screen event dates, and compute multi-year averages without downloading gigabytes of raw instrument files.
• Standardized data harmonization: Re-grids heterogeneous datasets onto common coordinate grids to facilitate direct intercomparisons between instruments.
• Rigorous data provenance: Every generated figure links to metadata displaying the underlying input files, processing algorithms, and exact citation details.
• Free public access: Fully supported by NASA funding without subscription charges or computational usage fees.

Limits

• Query execution limits: Server timeouts occur when users attempt to compute high-resolution daily time series over very large geographical regions or decades-long windows.
• Limited to gridded products: Giovanni operates exclusively on gridded Level 3 and Level 4 products; it cannot process ungridded Level 1 or Level 2 orbital swath pixels.
• Fixed statistical algorithms: Advanced custom statistical models or proprietary machine learning pipelines cannot be run within the server-side interface.

Alternatives

Researchers evaluating online analytical tools alongside desktop and cloud platforms compare Giovanni to several key alternatives:

Platform / Tool	Developer / Sponsor	Primary Architecture	Key Structural Differences from Giovanni
NASA Giovanni	NASA GES DISC	Web-based server-side analysis for Earth science parameters	Provides point-and-click statistical calculations, Hovmöller plots, and maps without requiring custom scripting.
NASA Worldview	NASA EOSDIS / GIBS	Interactive full-resolution daily imagery browsing	Focuses on qualitative visual inspection and rapid hazard tracking rather than statistical data analysis or CSV extraction.
Copernicus Climate Data Store (C3S)	ECMWF / European Union	Web portal and Python API for European climate datasets	Provides access to ERA5 and European models with Python API scripting; detailed in our Copernicus CDS guide.
Google Earth Engine (GEE)	Google	Cloud-based planetary-scale geospatial analysis platform	Requires JavaScript or Python programming; provides complete flexibility for custom algorithms across petabytes of imagery.
Panoply	NASA GISS	Cross-platform desktop application for NetCDF and HDF	Runs locally on user hardware; requires prior download of data files before generating geo-referenced plots.

FAQ

What does Giovanni stand for at NASA?

At NASA, Giovanni stands for the GES-DISC Interactive Online Visualization ANd aNalysis Infrastructure, an online portal designed to facilitate quick scientific analysis of Earth observation data.

Who maintains and operates NASA Giovanni?

Giovanni is maintained and operated by the Goddard Earth Sciences Data and Information Services Center (GES DISC), located at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Does NASA Giovanni require an account?

Users can explore basic features in guest mode, but an active NASA Earthdata Login account is required to unlock full visualization services, advanced plot types, and data downloads. Users must authorize the GES DISC application in their profile settings.

What data formats can be exported from Giovanni?

Visual plots can be downloaded as PNG or PDF files. The underlying processed scientific data can be exported in standardized analytical formats including GeoTIFF, NetCDF, and CSV tables.

What is the difference between Giovanni and NASA Worldview?

NASA Worldview is designed for visual browsing of daily satellite imagery layers served by GIBS. Giovanni is designed for numerical and quantitative data analysis, enabling researchers to calculate area averages, differences, correlations, and vertical profiles.

How do researchers cite datasets used in NASA Giovanni?

Each dataset visualized in Giovanni is assigned a Digital Object Identifier (DOI). Users should click the dataset shortname on the interface to access the landing page and cite the primary dataset DOI alongside acknowledging the Giovanni platform. For sharing open research manuscripts, see our guide on EarthArXiv.

Sources

• National Aeronautics and Space Administration. “Giovanni: The Bridge Between Data and Science (Version 4.40).” Goddard Earth Sciences Data and Information Services Center. URL: https://giovanni.gsfc.nasa.gov/giovanni/ (November 8, 2026).
• National Aeronautics and Space Administration. “Giovanni User Guide (Version 2024.1).” NASA GES DISC Documentation. URL: https://giovanni.gsfc.nasa.gov/giovanni/doc/UsersManualworkingdocument.docx.html (November 8, 2026).
• National Aeronautics and Space Administration. “Find Data: Featured Data Tools.” NASA Earthdata Learning Portal. URL: https://www.earthdata.nasa.gov/learn/find-data (November 8, 2026).
• Goddard Earth Sciences Data and Information Services Center. “Data Citation Policy and Guidelines.” NASA GES DISC Information. URL: https://disc.gsfc.nasa.gov/information/documents (November 8, 2026).