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Here we have collected links to fundamentals that our users haved asked about.  Such topics may be two-line elements,  calibration lookup tables for MODIS, near-real time data, and many more.  We keep in mind that the geometry and collocation of A-Train measurements will be one of the major issues for users.

For links to home sites of A-Train missions and instrument teams, please visit our Missions page.


NASA Facts about A-Train
An early NASA summary tour over rationale, participating satellites and instruments, and the scope of science issues covered.

Two-Line Elements (TLE)

A comprehensive archive of current and historical TLE.  For historical, users will need to establish an account.  Registered users can set automated download using Space Track TLE retriever.

Constellation Coordination System
You have to register to use these resources. This site allows you to view the status of the participating missions and to review the scheduled activities of each mission. You can also make use of the site's powerful mission analysis tool.

MODIS/Aqua Orbital Tracks
This site from the University of Wisconsin will give you Aqua tracks broken into 5-min ranges corresponding to MODIS granules. Very helpful to get a feel of MODIS coverage on a given day, at a given time and location.

MODIS/Aqua Subsets over AERONET Stations
This site from MODAPS will give you MODIS Aqua Data Subsets over 176 AERONET Stations on the Earth. This data has to be obtained from MODAPS via their Data Access Link. The data product prefix is of the form: (xxx refers to the AERONET site number).

MODIS Earth Location

A detailed document covering the instrument geolocation algorithm, bow-tie effect, detectors layout, visible bands aggregation, accuracy estimates, etc.  For advanced users for whom understanding the geometry of observations is critical.

MODIS Rapid Response System
The MODIS Rapid Response System was developed to provide daily satellite images of the Earth's landmasses in near real time. True-color, photo-like imagery and false-color imagery are available within a few hours of being collected.

Near-Real Time "quicklook" MODIS Data

MODIS Ocean Biology Processing offers access to near-real time, "quicklook", L1 and ocean L2 granules.  Use with care - these are not intended to have accurate calibration.  Scroll to the bottom of that page to find links to MODIS LUT.  The original source, though, for LUT is MCST.

MODIS Direct Broadcast
Direct Readout Lab, provides MODIS algorithms, and data from Direct Broadcast stations around the world.


Calibration lookup tables from MCST.

CALIPSO Browse Images
Full collection of CALIPSO imagery, driven by a simple user-friendly calendar, from LARC.

CALIPSO Expedited Browse

This portal from LARC is a very easy to use web browse tool that allows quick previews of the most recent CALIPSO L1B attenuated backscatter (at 1064 and 532 nm), and the L2 Vertical Feature Mask.

Overview of MLS

Users who are new to limb sounders, or the MLS mission in particular, should read this document. 

Acronyms from ESDIS

Can't decipher an acronym? Very likely it will be listed here.

Nasa Connect: The "A" Train Express

Students will take a ride on the "A" Train Express, and learn how weather affects everyone's daily lives. 


Touring the Atmosphere Aboard the A-Train

An excellent Physics Today article about the scientific discoveries made by the A-Train satellites and scientists using A-Train data, by Tristan S. L'Ecuyer and Jonathan H. Jiang.




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Last updated: Aug 03, 2010 12:31 PM ET