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Atmospheric Composition Portal

Accessing data

(Comming soon)

Visualizing data

In order to visualize data, click on the panel marked "ACP Data and Download". This will take you to a Map Viewer that displays various map layers. Zooming and panning are controlled by the icons on the right edge of the map. In order to add or remove layers from the display, click on the "+" icon on the upper right edge of the map.

Comparing two gridded datasets

ACP provides two tools for data comparison: a Harmonization tool, which creates side-by-side plots of two datasets using identical colormaps (palettes) and a Differencing tool. In order to use the Harmonization tool, first click the ACP Tools panel on the ACP front page, and then click the link for GOME-2 and OMI Harmonization. This will show two maps of Ozone from two different instruments, GOME-2 and OMI. (Additional species, such as NO2, will be coming soon.) The initial maps are drawn for a default date. To change the date, adjust the Date selections below the maps and click the Update Time button. In order to use the Differencing tool, click the link "Calculate Differences using NASA Giovanni". This takes about 30 seconds to a minute to process and then shows a map of the difference between GOME-2 and OMI for the same species. (Ozone is supported now, but other species will be coming soon.) To change the date for the differencing, adjust the Date selections below the map and click the Update Time button.

Accessing metadata and contextual information

Metadata and other contextual information can be accessed for some instruments by click on the panel titled "ACP Contextual Information". This provides a list of instruments. Clicking on one of these instruments provides a rich page of metadata and contextual information. On the left hand side of the page, titled "Dataspace", you can find a set of tabs with different kinds of information:

  • Metadata: provides descriptive information about the instrument and related items such as the platform and data products.
  • Catalogs: provides links to related dataset resources and catalogs registered in the various GEOSS portals.
  • Online References: provides links to related articles from and Delicious.
  • Usage: provides links to Applications and Educational sites that use data from that instrument.

On the right hand side of the page are additional resources culled from various sources on the internet, such as news or message boards.

Providing feedback

Feedback is encouraged in order to enhance the AC Portal. The AC Portal is only in its Alpha release version and substantial udates are expected over the next few months.
You can provide feedback in two ways:
1. Post a comment on AC Portal Technical Team collaboration site
2. Send an email to Chris.Lynnes[at]
Please note that this is an Alpha release, so some of the areas of the tool are not well populated yet with content. We will continue to work to fill that out, but if there are any areas that are higher priority for you, please let us know!

How to engage in the AC Portal development process

Though the AC Portal was initiated through the CEOSS ACC and CEOS WGISS as a collaboration among NASA and DLR, the AC Portal is intended to evolve as a community resource being contributed to, and used by, a broad range of organizations within the atmospheric composition community. If you are interested in participating in the AC Portal, you can either
1. Post a comment outlining your interests on the AC Portal Technical Team collaboration site
2. Send an email to stefan.falke[at]

Learn more about the AC Portal