Atmospheric Composition Portal
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 scholar.google.com 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.
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]nasa.gov.
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]gmail.com
Learn more about the AC Portal