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Aerosol Express release lets researchers try out Giovanni-4

Faster analysis speeds, new data analyses are available

Aerosol Express release lets researchers try out Giovanni-4

Giovanni-4 pixel map, showing the pixels used to create the scatter plot of MODIS-Terra and MODIS-Aqua AOD shown in Figure 1.

Aerosol Express release lets researchers try out Giovanni-4
Giovanni-4, the next generation of the popular online analysis and visualization tool Giovanni, is now available for aerosol variables and a subset of services. To try it out, go to the "Aerosols Express" data portal in Giovanni (, or go directly to
Giovanni-4 has several improvements over the current Giovanni (Giovanni-3), including:
  • most services are faster, sometimes by an order of magnitude;
  • interactive scatter plot + map: zoom either the scatter plot or map, and see the other visualization adjust automatically, corresponding to the change;
  • interactive map: zoom and pan the results;  and
  • bookmark-able selections:  bookmark the current state of the input form, and come back later (or again) to the form with the selections intact.
Over the next year, we will be migrating all of the existing Giovanni data variables and services to Giovanni-4. Do you have a particular data variable or analysis service you would like to see at the head of the queue? If so, send a message to the NASA GES DISC Help Desk.


 Giovanni-4 Interactive Scatterplot and Map, December 17, 2012, AOD over India


Figure 1. Example of the Giovanni-4.1 interactive scatter plot+map, showing the location of the data pixels which are plotted in the X-Y scatter plot, for December 17, 2004, over northern India.  The scatter plot shows a comparison of the MODIS-Terra and MODIS-Aqua aerosol optical depth at 550 nanometers data products acquired on this date by both sensors.  If the study area is changed to include a greater or lesser number of pixels, the scatter plot will adjust accordingly to display the new points and the regression line fit to those points.  (Click to view full-size image).     This day was a typically smoggy winter day in India:  a MODIS true color image (NASA Visible Earth) shows what it looked like from space.




Author: Chris Lynnes. Editing by Bill Teng, editing and Web formatting by James Acker.
The GES DISC is a NASA earth science data center, part of the NASA Earth Science Data and Information System (ESDIS) Project.
Questions and comments? Email the NASA GES DISC Help Desk:


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Last updated: Jan 10, 2013 03:03 PM ET