|
|
The Wildfire Event - Terra Mission - Data - Tools - CD Home |
|
Finding Coincident Terra Instrument data for a particular time/locale
Each day the Terra
satellite makes several orbital passes over the North American Continent.
The Terra instruments have different abilities to view areas laterally distant
from the orbital path. Thus to find coincident data for a particular location,
the user needs to consider the closest orbital approach. There are two tools
that assist in this evaluation:
1) A coincident
data search engine (CSE) is provided by the ESDIS Project at GSFC. The
CSE home page for access to the User's Guide and the tool is at
http://samogon.gsfc.nasa.gov/csp. 2) A predictive
and archive orbital viewing tool is provided by the Space Science and
Engineering Center (SSEC) of the University of Wisconsin-Madison at
http://www.ssec.wisc.edu/datacenter/terra.
An example of the
output for the SSEC tool for North America shows several
orbits
for 30 August 2000. The orbit for this sample data set shows that
Terra passes over western Montana and central Idaho from about 1550
to 1853 GMT. On the map produced by the SSEC tool, the descending daytime
orbit for the sample data is represented by the solid white line that
enters the map at cr. 1844 GMT near 93 degrees West and exits the map
at cr. 1857 GMT near 120 degrees West. Other solid lines are other orbits;
the dashed line is the limit at which an antenna at SSEC can acquire
Terra. Obtaining Terra Instrument data Data from Terra instruments can also be acquired by searching and ordering from the archives of the EOS Distributed Active Archive Centers (DAACs). The EOS Data Gateway (EDG) provides a means of searching all DAACs simultaneously. The EDG (at : http://eos.nasa.gov/imswelcome) also supports searching by time/locale. The DAACs can also provide search and order capabilities specialized for their particular data holdings. For information about NASA DAACs and their products and services, go to http://nasadaacs.eos.nasa.gov. |
