GINA is a mechanism within the University of Alaska (UA) for sharing data and technical capacity among Alaskan, Arctic, and world communities.
Established in 2001 as an initiative of UA’s President, GINA promotes collaboration at the local, state, and federal levels by increasing community-wide participation in the discovery and use of geospatial data. GINA’s products and services greatly expand the range of available analysis capabilities in order to better address research and management requirements.
|Satellite Imagery Captures Contrails and Their Shadows|
Posted 15 days ago
Recent imagery from the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument shows condensation trails over Alaska’s eastern Interior and over the eastern Brooks Range.
A condensation trail, or “contrail,” is a thin cloud left behind when the ambient humidity and temperature of the air allows the water vapor in an aircraft’s exhaust to condense and form a cloud. Some contrails dissipate rather quickly, while others may linger and even spread out over time, again all depending on the conditions of the ambient atmosphere.
This particular case is from the afternoon of Friday, October 7, and shows the true colors the human eye would see if we had hitched a ride on the satellite. Note the corkscrew contrails over the eastern Interior, and the more linear contrails over the eastern Brooks Range. At this time of year in northern Alaska the sun hangs low over the southern horizon during the afternoon, and shadows from the contrails can be seen on the ground below, offset slightly to the north.
Eielson Air Force Base’s “Red Flag-Alaska” exercise kicked off on October 6th, so these contrails appearing the following day may be associated with those activities. Contrails from civilian aircraft tend to appear more linear than the wide looping tracks evident in this imagery.
More information about the VIIRS instrument is available at http://ncc.nesdis.noaa.gov/VIIRS/ More information about Red Flag-Alaska is available at http://www.eielson.af.mil/Info/REDFLAG-Alaska.aspx
GINA receives numerous geospatial data sets, many in real time. Information is then rapidly processed and managed for use by scientiﬁc researchers, state and federal agencies, and the general public.
GINA is involved with many Alaskan, Arctic and International projects. Our goal is to increase community-wide participation in the discovery and sharing of geospatial data.
GINA teams with partner institutions and agencies to create information products and services that are used in a variety of projects to better display and understand spatial information.